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Free mock test of SSC JE previous year exam questions asked in Jan-2018 set-1.
Which single phase motor would you select for a tape recorder?
(A) Reluctance motor
(B) Hysteresis motor
(C) Synchronous motor
(D) Universal motor
Answer – B Hysteresis motor
The direction of rotation of an hysteresis motor is determined by?
(A) Interchanging the supply leads
(B) Position of shaded pole with respect to main pole.
(C) Retentivity of the rotor material.
(D) None of these.
Answer B Position of shaded pole with respect to main pole.
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
(A) improve power factor
(B) increase overload capacity
(C) reduce fluctuations in torque
(D) to improve torque
Answer A improve power factor
The purpose of stator winding in the compensated repulsion motor is to
(A) provide mechanical balance
(B) improve power factor and provide better speed regulation
(C) prevent hunting in the motor
(D) eliminate armature reaction
Answer B improve power factor and provide better speed regulation
A hysteresis motor works on the principle of?
(A) hysteresis loss
(B) magnetisation of rotor
(C) eddy current loss
(D) electromagnetic induction
Answer A hysteresis loss
Torque developed by a single phase induction motor at starting is?
(A) pulsating
(B) uniform
(C) Non- uniform
(D) Zero
Answer D Zero
What are the advantages of DC transmission system over AC transmission system?
(A) DC system is economical
(B) There is no skin effect in DC system
(C) Corona limits are highest for DC circuits as compared to AC circuits
(D) All options are correct
Answer B There is no skin effect in DC system
The high voltage line which feeds the substations, distribution transformers represent?
(A) primary transmission
(B) secondary transmission
(C) primary distribution
(D) secondary distribution
Answer B secondary transmission
Which of the following is not a standard transmission voltage?
(A) 132 kv
(B) 222 kv
(C) 400 kv
(D) 760 kv
Answer B 222kV
Dielectric strength of rubber is around ?
A. 3kV /mm
B. 10kV /mm
C. 30kV /mm
D. 300kV /mm
Answer C 30kV/ mm
The number of conductors in a double circuit transmission line is
(A) one earth conductor along with four conductors
(B) one earth conductor along with six conductors
(C) one earth conductor along with seven conductors
(D) one earth conductor along with eight conductors
Answer B one earth conductor along with six conductors
The earth conductor carried in high voltage transmission line is?
(A) above the line conductors
(B) below the line conductors
(C) between the line conductors
(D) None of these
Answer A above the line conductors
The type of wiring that is highly suitable for a temporary shed is?
(A) Cleat wiring
(B) wooden capping and casing wiring
(C) lead sheathed wiring
(D) conduit wiring
Answer A Cleat wiring
To prevent excessive brightness, which type of lighting scheme is used ?
(A) direct
(B) indirect
(C) general
(D) local
Answer B indirect
Ohm’s law is applicable to?
(A) Constant and Variable Temperatures
(B) Constant Temperature
(C) Variable temperature
(D) any of the options
Answer B Constant Temperature
Most of the fuses operate due to?
(A) heating effect of current
(B) magnetic effect of current
(C) electrostatic effect of current
(D) induction effect of current
Answer A heating effect of current
Pin insulators are normally used up to voltage of about?
(A) 33 KV
(B) 66KV
(C) 100kV
(D) 11 KV
Answer A 33kV
The core of the transformer is made of?
(A) copper
(B) aluminium
(C) air
(D) Laminated sheath
Answer D Laminated sheath
Forced draft fan handling which type of air?
(A) Cold air
(B) Hot air
(C) Flue gas only
(D) Fresh air only
Answer A Cold Air
Who invented the alternating current?
(A) Tesla
(B) Faraday
(C) Maxwell
(D) Edison
Answer A Tesla
The function of inert gas in filament lamp is?
(A) increase the illumination
(B) decrease the power consumption.
(C) minimize the effect of evaporation during service
(D) decrease the Clare.
Answer C minimize the effect of evaporation during service
In Which one of the following is flexible wire is not used?
(A) T.V.
(B) Table fan
(C) Table light
(D) Cement factory
Answer D Cement factory
The gas used in gas filed filament lamp?
(A) Helium
(B) Oxygen
(C) Nitrogen
(D) Ozone
Answer C Nitrogen
The output of Tungsten filament lamp depends on?
(A) Size of lamp
(B) Size of shell
(C) Temperature of filament
(D) All options are correct
Answer C Temperature of filament
In arc welding the voltage on AC supply system is in the range?
(A) 1000-1200V
(B) 400-500V
(C) 200-250V
(D) 70-1000V
Answer D 70-1000V
Which of the following is not a welding accessory ?
(A) Electrode holder
(B) Hand screen
(C) Cable
(D) Gloves
Answer C Cable
The temperature inside a furnace is usually measured by?
(A) Mercury thermometer
(B) Optical pyrometer
(C) Alcohol thermometer
(D) Any of the options is correct
Answer B Optical pyrometer
In electric resistance welding?
(A) The current required exceeds 100A.
(B) The voltage required ranges from 4 to 12 V.
(C) The amount of power supplied to the weld usually ranges from 60 watts to 80 watts for each square mm of area.
(D) All options are correct.
Answer D All options are correct.
Which of the following is a trivalent?
(A) Boron
(B) Aluminium
(C) Indium
(D) All options are correct
Answer D All options are correct
Which of the following are immobile?
(A) Electrons
(B) Holes
(C) Ions
(D) None of these
Answer C Ions
In an RC coupled amplifier, low frequency response is improved with?
(A) lower R1
(B) higher Cc
(C) less gain
(D) more bias
Answer C less gain
The direction of rotation of a DC shunt motor is reversed by .
(A) reversing armature connections
(B) interchanging the armature and field connection
(C) adding resistance to the field circuit
(D) reversing supply connections
Answer A reversing armature connections
Which of the following is a correct statement about a series motor?
(A) Its field winding consists of thicker wire and less turns
(B) It can run easily without load
(C) It has an almost constant speed
(D) It has poor torque
Answer A Its field winding consists of thicker wire and less turns
What is the characteristics of an ideal voltage amplifier with respect to the input and output impedance?
(A) Low input and high output impedance
(B) High input and low output impedance
(C) Low input and low output impedance
(D) High input and high output impedance
Answer B High input and low output impedance
The percentage full load slip in a synchronous motor is?
(A) 0.01
(B) 0.005
(C) 1
(D) zero
Answer D Zero
In synchronous motor the armature current has higher values for?
(A) high excitation only
(B) low excitation only
(C) both high excitation only and low excitation only
(D) None of these
Answer C both high excitation only and low excitation only
An unexcited single phase synchronous motor is called as?
(A) universal motor
(B) repulsion motor
(C) AC series motor
(D) reluctance motor
Answer D reluctance motor
A constant speed motor is?
(A) D.C. shunt motor
(B) synchronous motor
(C) induction motor
(D) D.C. compound motor
Answer B synchronous motor
In a synchronous motor it the back e.m.f. is approximately equal to the applied voltage, then?
(A) the torque generated is maximum
(B) the excitation is said to be hundred per cent
(C) the excitation is said to be zero percent
(D) the motor is said to be fully loaded
Answer B the excitation is said to be hundred per cent
A synchronous motor can operate at ?
(A) leading power factor only
(B) lagging power factor only
(C) unity power factor only
(D) lagging, leading and unity power factors
Answer D lagging, leading and unity power factors