A hydro-electric generating station is supplied from a reservoir of capacity 5 x 106 cubic meter at a head of 200 meter. Find the total energy available in kWh, if the overall efficiency is 75%.
a. 2 x 106 kWh b. 2 x 105 kWh c. 2 x 107 kWh d. 2 x 104 kWh
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer a. 2 x 106 kWh[/bg_collapse]
The electric switch to control any electrical equipment will act as a:
a. PD controller b. Proportional controller c. PID controller d. ON/OFF controller
Identify the properties for neutral wire and earth wire from the given list. i) It is connected to the neutral point of the transformer that is earthed at the substation. ii) It is a solid earth at the substations iii) Unbalanced current flows through it iv) Only fault current flows through it
a. Neutral wire: (i) and (iv); Earth wire: (ii) and (iii) b. Neutral wire: (i), (iii) and (iv); Earth wire: (ii) c. Neutral wire: (i) and (iii); Earth wire: (ii) and (iv) d. Neutral wire: (i); Earth wire (ii), (iii) and (iv)
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. Neutral wire: (i) and (iii); Earth wire: (ii) and (iv) [/bg_collapse]
In a dc motor, the commutation is used to:
a. Convert dc current from armature conductor to ac current feedback to supply b. Convert ac current from armature conductor to dc current feedback to supply c. Convert dc current from supply to ac current in armature conductor d. covert ac current from supply to dc current in armature conductor
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. Convert dc current from supply to ac current in armature conductor [/bg_collapse]
In an electric magnetic circuit, for establishing a magnetic field:
a. The movement of coil is required. b. Energy need not be spent, though energy is required to maintain it. c. Energy must be spent, though no energy is required to maintain it. d. Energy is not at all required.
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. Energy must be spent, though no energy is required to maintain it. [/bg_collapse]
Which for the following transmission systems has the maximum efficiency?
a. Gear drive b. Belt drive c. Rope drive d. Direct drive
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Ans. d. Direct drive [/bg_collapse]
The Laplace transform of u(t) = 1, t > 0; u(t) = 0 for t < 0 is:
The factors influencing costs and tariffs of electric supply are:
a. Standing charges that are independent of the output and (ii) running or operating charges that are proportional to the output. b. Standing charges the are proportional to the output and (ii) running or operating charges that are independent of the output c. Standing charges that are proportional to the output and (ii) running or operating charges that are proportional to the output d. Standing charges that are independent of the output and (ii) running or operating charges that are independent of the output.
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer a. a. Standing charges that are independent of the output and (ii) running or operating charges that are proportional to the output.[/bg_collapse]
A long transmission line has a large capacitance. If such a line is open-circuited or connected to the very light load at the receiving end, the magnitude of the voltage at the receiving end becomes higher than the voltage at the sending end. Such a phenomenon is called:
a. Skin effect b. Corona loss c. Ferranti effect d. Sag in transmission lines
Which of the following functionalities is not possible in the PLC during the “Run Mode”?
a. Executes the ladder program and energises output devices. b. Prevents online program editing. c. Places the processor in the RUN mode. d. Allows you to perform program entry and editing.
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ] Answer. d. Allows you to perform program entry and editing. [/bg_collapse]
With respect to liquids fuels, which statement of the following is incorrect?
a. The combustion of liquid fuels is uniform. b. The handling of liquid fuels is easier and they require less storage space. c. The firing of liquid fuels can be easily controlled. d. Liquid fuels leave very large quantity of ash after burning as compared to solid fuels.
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. Liquid fuels leave very large quantity of ash after burning as compared to solid fuels [/bg_collapse]
Which of the following materials has the least resistivity?
The terminal voltage of a long shunt dc generator could be determined as:
a. V = Eg + la Ra b. V = Eg – laRa c. V = Eg + la(Ra + Rs) d. V = Eg – la(Ra + Rs)
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer d. V = Eg – la(Ra + Rs)[/bg_collapse]
Active materials of a lead-acid cell are:
a. Lead peroxide, sponge lead and dilute sulfuric acid b. Lead peroxide and filler caps c. Lead peroxide and pillar d. Sponge lead and pillar
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Ans. a. Lead peroxide, sponge lead and dilute sulfuric acid [/bg_collapse]
Which of the following statements is not true with respect to ac transmission systems?
a. The maintenance of ac sub-stations is easy and inexpensive. b. The ac voltage can be stepped up or stepped down by transformers with ease and efficiency. c. Due to skin effect in the ac system, the effective resistance of the line is decreased. d. The power can be generated at high voltages.
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer c. Due to skin effect in the ac system, the effective resistance of the line is decreased.[/bg_collapse]
The law that describes the economic choice of conductor size is:
a. Fleming’s Law b. Ohm’s law c. Faraday’s law d. Kelvin’s law
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. Kelvin’s law [/bg_collapse]
The overall efficiency of a steam power plant is about
a. Due to short circuit between two conductors b. Due to insulation breakdown between one of the phase and earth c. Due to the breakdown of insulation between two phases and simultaneous breakdown of insulation between the third phase and earth d. Due to fault breakdowns of insulation between two phases and earth occur
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Due to insulation breakdown between one of the phase and earth [/bg_collapse]
The use of optical isolation in the input module side of a controller device is to:
a. Reduce the effect of electrical noise and prevent damage to the processor due to line voltage transient b. Prevent damage the processor due to line voltage transient c. Provide common ground d. Reduce the effect of electrical noise
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. Reduce the effect of electrical noise and prevent damage to the processor due to line voltage transient [/bg_collapse]
In the overhead system the maximum disruptive stress exists between the:
a. Phase conductor and neutral b. Conductor and the earth c. Conductors d. Conductor and pole
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Conductor and the earth [/bg_collapse]
The load side typical distribution system has:
a. 2 wire 440 V b. 3 wire, 440 V c. 4 wire, 440 V d. 1 wire, 230 V
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. 4 wire, 440 V [/bg_collapse]
Which of the following Indian Electrical Rules describes the guarding in an electrical system?
Consider the below points: i) Minimum size of cable ii) Voltage drop iii) Current carrying capacity iv) Type of insulation used Which of the above constitute specifications that need be considered while selecting wires?
a. (I), (ii), (iii) and (iv) b. (iv) and (ii) c. (ii), (iii) and (iv) d. (i), (ii) and (iii)
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. (I), (ii), (iii) and (iv) [/bg_collapse]
_________is an electromechanical device that consists of an actuator mechanically linked to a set of contacts. When an object comes into the contact with the actuator, the device operates the contacts to make or break an electrical connection.
a. A relay b. A photoelectric switch c. A circuit breaker d. A limit switch
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. A limit switch [/bg_collapse]
With respect to automation, choose the wrong statement.
a. It provides better working conditions for workers b. It decreases unemployment c. The is an increase in productivity d. There is a reduction in the production cost
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Ans. b. It decreases unemployment [/bg_collapse]
A 100 MW steam station uses coal of calorific value 6400 kcal/kg. Thermal efficiency of the station is 30% and electrical efficiency is 92%. Find the overall efficiency of the plant.
The objective of automation is to cause the work system to be automatic such that the system becomes:
a. Self-reliant only b. Self-acting, self-regulating and self-reliant all c. Self-regulating only d. Self-acting only
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Self-acting, self-regulating and self-reliant all [/bg_collapse]
In terms of energy bands, semiconductors can be defined as those materials that have:
a. Almost an empty conduction band and almost filled valence band with a very narrow energy gap between the conduction and valence band. b. Almost an empty conduction band and almost filled valence band with a very high energy gap between the conduction and valence band c. Almost and empty conduction band and low filled valence band with a very narrow energy gap between the conduction and valence band d. Almost full conduction band and almost filled valence band with a very narrow energy gap between the conduction and valence band
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer a. Almost an empty conduction band and almost filled valence band with a very narrow energy gap between the conduction and valence band.[/bg_collapse]
In railway electrification, the voltage and frequency, respectively, of the three-phase AC system are:
a. 25 kV and 50 Hz b. 3 to 3.5 kV and 16 2/3 Hz c. 1500 V and 50 Hz d. 600 V and 50 Hz
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer b. 3 to 3.5 kV and 16 2/3 Hz[/bg_collapse]
Which of the following characteristics is not an electrical characteristic considered during the selection of a motor?
a. Running characteristics b. Starting characteristics c. Transmission of drive d. Speed control
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. Transmission of drive[/bg_collapse]
Which of the following control methods in not preferred for AC drives?
a. Changing the supply frequency b. Injecting resistance in the rotor circuit c. Field control method d. Changing the supply voltage
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ] Answer. c. Field control method[/bg_collapse]
The equipment that is used to disconnect the main under the no-load condition for safety isolation and maintenance is called:
a. Earthling switch b. Isolator c. Busbar d. Line trap
Which option represents the correct sequence of the flow of the electrical power from the generating station to the load.
a. Primary transmission, secondary distribution b. Primary transmission, primary distribution c. Primary transmission, secondary transmission d. Primary transmission, secondary transmission, primary distribution and secondary distribution
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. Primary transmission, secondary transmission, primary distribution and secondary distribution [/bg_collapse]
One lumen per square metre is termed as:
a. Candle power b. MHCP c. One lux d. MSCP
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. One lux [/bg_collapse]
Which of the following control devices is used to provide protection against accidents by rapidly interrupting dangerous contact voltages that may be present in the electrical equipment’s as a result of ground faults, insufficient insulation, insulation failure, or misuse and sabotage?
a. Optical switch b. Push-button control switch c. Float switch d. ELCB
Determine the pitch factor for winding: 36 stator slots, 4-poles, coil spans 1 to 8.
a. cos 20° b. cos 40° c. cos 30° d. cos 80°
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. cos 20° [/bg_collapse]
In the case of alternator cooling, a large quantity of air is passed through sub slots, which are just below the main slots. Such type of cooling is known as:
a. Closed circuit ventilation b. Radial ventilation c. Multiple inlet system of ventilation d. Axial ventilation
A hydroelectric generating station is supplied from a reservoir of capacity 6 million m3 at a head of 170m. Determine the potential energy stored in this water.
With respect to damping system in instruments, choose the incorrect statement.
a. It should always oppose the activating torque b. Damping system should produce damping torque only when position is in motion c. Damping torque should be proportional to the velocity of pointer but independent of operating current d. It must not affect the controlling torque
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. It should always oppose the activating torque [/bg_collapse]
Which of the following device system is capable of operating in high temperature with poor conditions in dusty, dirty, corrosive atmospheres and withstand shock and vibration?
a. Laptop b. iPad c. Personal computer d. PLC
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer d. PLC[/bg_collapse]
Which of the following standards has to be followed for drawing an electrical installation plan?
a. IS: 375-1985 b. IS: 675-1955 c. IS: 732-1989 d. IS: 375-1951
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer d. IS: 375-1951[/bg_collapse]
What is the l’s complement of (-011012)?
a. 010102 b. 100112 c. 100102 d. 010112
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer d. 010112[/bg_collapse]
There exist three terminals in a relay called C, NO, NC, in an application, it is desired that whenever the relay is active the load must be connected be supply, otherwise the load will be disconnected from supply. Which of the following connection type in relay will provide solution to the stated problem?
a. Supply to the NC terminal and load to the C terminal b. Supply to the C terminal and load to the NO terminal c. Supply to the C terminal and load to the NC terminal d. Supply to the NC terminal and load to the NO terminal
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Supply to the C terminal and load to the NO terminal [/bg_collapse]
If the effective mass of the train = Me ton, acceleration = α Km/sec2, then the tractive force (Ft) is equal to:
a. Me x α x 106 N b. Me x α x 103 N c. Me x α x 105 N d. Me x α x 104 N
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. Me x α x 106 N[/bg_collapse]
The required properties of traction batteries are:
a. High volumetric capacity and less service life b. Low volumetric capacity and long service life c. Constant output voltage, high resistance to vibration, and high volumetric and long service life d. Constant output voltage, low resistance to vibration
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. Constant output voltage, high resistance to vibration, and high volumetric and long service life [/bg_collapse]
The cost of conductor material required can be reduced with the reduction in the volume of conduction material. This is possible with an:
a. increase in the frequency of the supply b. increase in the transmission current c. increase in the transmission voltage d. increase in the transmission power
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. increase in the transmission voltage [/bg_collapse]
Find the decimal equivalent of the 6-bit binary number (101.101)2.
a. 5.2510
b . 5.12510
c. 5.62510
d. 6.62510
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer c. 5.62510[/bg_collapse]
To improve earth resistance for protection which of the following methods is/are used? (i) Use longer ground rods (ii) chemically treat the soil (iii) use multiple ground rods
a. (i) and (ii) b. (ii) and (iiI) c. (ii) only d. (i), (ii) and (iii)
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. (i), (ii) and (iii) [/bg_collapse]
Consider the below points: (i) Distance between stops (ii) Acceleration and retardation (iii) Gradient (iv)Train resistance Which of the above factors affect the specific energy consumption in trains?
a. (i) and (ii) only b. (i), (ii), (iii) and (iv) c. (ii) and (iii) only d. (i), (ii) and (iii) only
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. (i), (ii), (iii) and (iv) [/bg_collapse]
Which of the following elements has/have approximate characteristics for resistance?
a. Direct stroke on the ground wire b. Direct stroke on the line conductor c. Indirect stroke on the conductor d. Direct stroke on the tower top
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Direct stroke on the line conductor [/bg_collapse]
Three capacitors of 2 μ F, 5 μ F and 10 μ F have breakdown voltage of 200 V, 500 V and 100 V respectively, The capacitors are connected in series and the applied direct voltage to the circuit is gradually increased. Determine the total applied voltage at the point of breakdown.
a. 320 V b. 150 V c. 250 V d. 100 V
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. 320 V [/bg_collapse]
___________is a temperature sensitive resistor, whose resistance decreases with increasing temperature.
a. Proximity sensor b. Copper wire sensor c. Gold leaf sensor d. Thermistor
Which of the following are the requirements for a good lighting system? (i) The illuminating source should have sufficient light (ii) The illuminating source should not strike the eyes (iii) The illuminating source should have suitable shades and reflectors. (iv) The illuminating source should be installed at such a place so as to give uniform light.
a. (ii), (iii) and (iv) b. (i), (iii) and (iv) c. (i), (ii), and (iv) d. (i), (ii), (iii) and (iv)
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. (i), (ii), (iii) and (iv) [/bg_collapse]
A capacitor consists of two
a. Insulation separated by a dielectric b. Conductors separated by an dielectric insulator c. Ceramic plates and one mica disc d. Silver coated insulators
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Conductors separated by an dielectric insulator [/bg_collapse]
Which of the following sensors is used to measure the change in light quantity caused by the target crossing the optical axis?
a. A through- beam type sensor b. LED c. LASER d. Reflective-type photoelectric sensor
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. A through- beam type sensor [/bg_collapse]
Which of the following is the advantage of a joint box system?
a. The fault location is easy to detect b. The cost of wiring is saved c. It require least skilled labour d. No chance of short circuit
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. The cost of wiring is saved [/bg_collapse]
A steel- cored aluminium conductor consists of central core of wires surrounded by a number of:
a. galvanised steel; aluminium strands b. copper; aluminium strands c. aluminium; copper strands d. aluminium; steel strands
Which of the following magnetic materials is preferred for very-high-frequency communication systems?
a. Nickel-iron alloys containing up to 80% of nickel b. Rolled steel c. Forged steel d. Nickel-iron alloys containing up to 20% of nickel
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. Nickel-iron alloys containing up to 80% of nickel [/bg_collapse]
Which of the following Indian Electrical Rules describes about the periodical and testing of consumer’s installation?
a. control the outputs only b. execute the control program only c. read inputs only d. read inputs, execute the control program and update output
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. read inputs, execute the control program and update output [/bg_collapse]
How to convert a (0 to 1) mA meter to measure the current in the range of 1 to 100 mA ? The internal resistance of the meter is 100Ω
a. Connect a 1.01 Ω resistance in series with the meter b. Connect a 1.01 Ω resistance in parallel with the meter c. Connect a 10.01 Ω. resistance in series with the meter d. Connect a 10.01 Ω. resistance in parallel with the meter
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Connect a 1.01 Ω, resistance in parallel with the meter [/bg_collapse]
Which of the following is not a peak power plant?
a. Gas plant b. Solar and wind power plant c. Diesel power plant d. Thermal power plant
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. Thermal power plant [/bg_collapse]
The MVM instruction in PLC stands for:
a. Move data from memory to memory b. Move data via direct memory access c. Move data from reg to memory d. Masked move
In case of programmable automation, are there any changes/is there any change possible to be done in the sequence of operations?
a. Possible by changing the processor b. Possible by changing the program c. Possible by changing the embedded system d. Not possible
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Possible by changing the program [/bg_collapse]
To generate emf, which of the following methods may be used? (i) Stationary field system with rotating armature (ii) Stationary armature with rotating field system (iii) Stationary field and stationary armature
a. (i), (ii), and (iii) b. (ii) only c. (i) only d. (i) and (ii)
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. (i) and (ii) [/bg_collapse]
It is decided that the copper rod earthing is to be installed, then the size of the rod required for earthing is:
a. 12.5 mm b. 19 mm c. 12.5 cm d. 19 cm
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. 12.5 mm [/bg_collapse]
ln case of small power installations, the number of GI of copper plates required for earthing is:
The ratio a power plant’s actual output over a period of time to its potential output if it were possible for it to operate at full name plate capacity continuously over the same period of time is known as:
a. Demand factor b. Diversity factor c. Average load d. Plant capacity factor
Which fault is more frequently occurring in power system?
a. Line to line fault b. Double line to ground fault c. Single line to ground fault d. Symmetrical 3 phase fault
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. Single line to ground fault [/bg_collapse]
In a PMMC instrument, the final steady state deflection is:
a.α i, where i is the current through the coil b. α 1 / i, where i is the current through the coil c. α i2, where i is the current through the coil d. α 1 / 12, where I is the current through the coil
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. α i, where i is the current through the coil [/bg_collapse]
The operating time values of fuse and circuit breakers are:
a. For fuse: around 0.02 second, and for circuit breaker: (0.002 to 0.005) second b. For fuse: around 0.2 second, and for circuit breaker: (0.2 to 0.5) second c. For fuse: around 0.002 second, and for circuit breaker (0.02 to 0.05) d. For fuse: around 0.02 second, and for circuit breaker: (0.2 to 0.5) second
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. For fuse: around 0.002 second, and for circuit breaker: (0.02 to 0.05) [/bg_collapse]
Which of the following control devices is used to control/operate industrial equipment ?
a. PLC b. Microprocessor c. Discrete analog devices d. DSP
The ____________is a temporary storage area used by the CPU to store a relatively _________ amount of data for interim calculations and control.
a. Scratch pad area; large b. Application memory; large c. Executive area; small d. Scratch pad area; small
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. Scratch pad area; small [/bg_collapse]
Which of the following law states that “whenever the magnetic flux lining a conductor or coil changes, an emf is induced in it?
a. Fleming’s right hand rule b. Faraday’s first law of electromagnetic induction c. Lenz’s law d. Faraday’s second law of electromagnetic induction
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Faraday’s first law of electromagnetic induction [/bg_collapse]
The nature of emf induced in the armature of a dc generator ______ is and it is converted into ______ by means of split rings.
a. DC ; AC b. AC ; AC c. DC; DC d. AC ; DC
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. AC ; DC [/bg_collapse]
In an alternator, when the armature current increases, the terminal voltage drops due to:
a. Armature reaction b. Armature effective resistance, armature leakage reactance and armature reaction c. Armature effective resistance d. Armature leakage reactance
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Armature effective resistance, armature leakage reactance and armature reaction [/bg_collapse]
For under water movement of a submarine the power is provided by:
a. tidal energy b. MHD generator c. batteries d. Thermionic generator
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. batteries[/bg_collapse]
Once a synchronous machine is synchronized, it will tend to remain in synchronism with the other alternators. Any tendency to depart from the condition of synchronism is produced due to circulating current flowing through the alternators.
a. Opposed by a motor torque b. Opposed by a load torque c. opposed by a synchronizing torque d. Aided by a synchronizing torque
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. opposed by a synchronizing torque [/bg_collapse]
Let α be the angle, in electrical degrees, by which the span of the coil is less than a pole pitch in alternator. At the fundamental frequency, the pitch factor is equal to:
a. Cos α b. Cos α/2 c. Sin α d. Sin α/2
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Cos α/2 [/bg_collapse]
With respect to dynamometer type measuring instruments, choose the incorrect statement.
a. They have a uniform scale b. They can be used to measure both AC & DC c. They are free from hysteresis and eddy current losses d. They have Low torque/weight ratio
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. They have a uniform scale[/bg_collapse]
With respect to alternator rotor types, select the correct option.
a. Salient pole rotor type:- causes speed fluctuation and suitable for high-speed operation. Cylindrical rotor type:- causes no speed fluctuation and suitable for low-and medium-speed operation. b. Salient pole rotor type:- causes speed fluctuation and suitable for- low and medium-speed operation. Cylindrical rotor type: causes no speed fluctuation and suitable for high-speed operation c. Salient pole rotor type: causes no speed fluctuation and suitable for high-speed operation. Cylindrical rotor type: causes speed fluctuation and suitable for low-and medium-speed operation. d. Salient pole rotor type: causes no speed fluctuation and suitable for low-and-medium speed operation. Cylindrical rotor type: causes speed fluctuation and suitable for high-speed operation.
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer b. Salient pole rotor type:- causes speed fluctuation and suitable for- low and medium-speed operation. Cylindrical rotor type: causes no speed fluctuation and suitable for high-speed operation[/bg_collapse]
The electrically-controlled magnetic materials used in machines should have:
a. low permeability and high saturation flux density b. high permeability and high saturation flux density c. Low permeability and low saturation flux density d. high permeability and low saturation flux density
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. high permeability and high saturation flux density[/bg_collapse]
The loads in metal cutting and drilling tool drives, drives for forklift trucks, mine hoist etc. are considered to be:
a. Intermittent periodic duty in the starting b. Short time duty c. Continuous duty d. Continuous duty with staring and braking
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. Intermittent periodic duty in the starting [/bg_collapse]
The direction of the magnetic field around the current-carrying conductor could be determined by:
a. Right hand thumb rule b. Left hand thumb rule c. Lenz’s law d. Fleming’s right hand rule
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. a. Right hand thumb rule [/bg_collapse]
The capacitance of capacitor is NOT influenced by
a. Plate thickness b. Plate area c. Plate separation d. Nature of the dielectric
The surge tanks are usually provided in high or medium head _________ power plants when considerably _______ is required.
a. Hydro-electric, short penstock b. Hydro-electric, long penstock c. Thermal, short penstock d. Thermal, large steam turbine
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. Hydro-electric, long penstock[/bg_collapse]
An XNOR gate produces an output only when the two inputs are:
a. High b. Different c. Low d. Same
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. Same[/bg_collapse]
The generation of power in a power plant has to be controlled to meet the:
a. Demand of load and power factor b. Demand of load only c. Demand of load and frequency d. Frequency and power factor
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. Demand of load and frequency [/bg_collapse]
In electrical wiring, the fuse should be placed:
a. In earth wire b. In live or phase wire c. In lamp directly d. Neutral wire
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. In live or phase wire [/bg_collapse]
The overall efficiency of a steam power station is computed as:
a. (Steam energy) / (heat of combustion of coal) b. (Heat equivalent of electrical output) / (Heat of combustion of coal) c. (Heat equivalent of mechanical energy transmitted to turbine shaft) / (Heat of coal combustion) d. (Heat of combustion of coal) / (Mechanical energy)
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. b. (Heat equivalent of electrical output) / (Heat of combustion of coal) [/bg_collapse]
ln terms of energy bands, insulators have:
a. Full conduction band b. Very small energy gap c. Full valence band d. Moderate energy gap
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. Full valence band [/bg_collapse]
If a single motor drives a number of machines through belts from a common shaft, such a type of drive system is known as:
a. Individual drive b. Complex motor drive c. Multi motor drive d. Group drive
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. d. Group drive[/bg_collapse]
Which of the following points represent the essential features of switchgear? i) Complete reliability ii) Absolutely certain discrimination iii) Quick operation iv) Provision for manual control
a. (ii), (iii) and (iv) only b. (i), (iii) and (iv) only c. (i), (ii), (iii) and (iv) d. (i), (ii) and (iii) only
[bg_collapse view=”button-orange” color=”#4a4949″ expand_text=”Show Answer” collapse_text=”Show Less” ]Answer. c. (i), (ii), (iii) and (iv) [/bg_collapse]
Which of the following can be placed near the main board to protect the whole installation?
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