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Home » [FREE DOWNLOAD] MRPL PREVIOUS YEAR QUESTION PAPER 21-FEB-2021 PDF SERIES-2

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MRPL PREVIOUS YEAR QUESTION Feb 2021 Series-2

MRPL Electrical 21-Feb-2021 question paper. I have created mock question paper. Please check your skills.

1 / 39

The capacity of a cell depends upon

2 / 39

1:5 step-up transformer has 120V across the primary and 600 ohms resistance across the secondary. Assuming 100% efficiency, the primary current will be:

3 / 39

How can reactive power delivered by a synchronous generator be controlled?

4 / 39

The capacitance of the two capacitors are in the ratio 1:2. When they are connected in parallel across supply voltage v, their charges will be in the ratio of

5 / 39

Which of the following can be used to control the speed of a d.c motor?

6 / 39

The shunt used in the millimeter

7 / 39

A 6 pole, 3 phase alternator running at 1000rpm supplies to an 8 pole, 3 phase induction motor which has a rotor current of frequency 2Hz. The speed at which the motor operates is.

8 / 39

Sparking at the commutators of a dc motor may result in

9 / 39

What are the conditions to be satisfied for alternators to be synchronized with an incoming supply?

1. Equal voltage

2. Equal frequency

3. Same power rating

4. Same phase sequence

Select the correct answers using the code given below

10 / 39

The pressure coil of a dynamometer type wattmeter is

11 / 39

When a sinusoidal voltage is applied across a R-L series circuit having R XL, the phase angle will be

12 / 39

Wheatstone bridge is used to measure

13 / 39

What would happen if the field of d.c shunt motor is opened

14 / 39

The commonly used material of condenser tube is

15 / 39

Regenerative method of braking is based on that

16 / 39

The dc series motors are preferred for traction applications because

17 / 39

When a source is delivering maximum power to the load, the efficiency will be

18 / 39

The crawling in the induction motor Is caused by

19 / 39

The pressure at the furnace is minimum in case of

20 / 39

The full load copper loss and iron loss of a transformer are 6400W and 5000W respectively the copper loss and iron loss at half load will be respectively.

21 / 39

The use of higher flux density in the transformer design

22 / 39

Hysteresis loss in a magnetic material depends upon

23 / 39

The eddy current loss in the transformers occurs in the

24 / 39

The ohm’s law deals with the relation between

25 / 39

Potential inside a hollow charged sphere is

26 / 39

If a sinusoidal wave has frequency of 50 Hz with 15 ampere rms value. Which of the following equation represents?

27 / 39

A signal of 10mV at 75MHz is to be measured. Which of the following instruments can be used

28 / 39

What is the angle between the induced voltage and supply voltage of a synchronous motor under running generation?

29 / 39

Which of the following motors is most suitable for signaling devices and many kinds of timers

30 / 39

A cell of emf x and internal resistance y is connected to a resistance y. The potential difference between the terminals of the cell is

31 / 39

In an induction motor what is the ratio of rotor copper-loss and rotor input

32 / 39

An alternating quantity which attains its positive maximum value prior to the other is called the

33 / 39

Capacitance of a parallel plate capacitor decreases by

34 / 39

The short circuit test in the transformers is performed to determine

35 / 39

According to Fleming’s right hand rule for finding the direction induced emf, when induced finger points in the direction of induced emf, forefinger will point the direction of

36 / 39

In hard-tool applications which one of the following single-phase motors is used

37 / 39

When does a synchronous motor operate with leading power factor current?

38 / 39

The three resistors each of r ohm are connected in star. When they are transformed into delta connections, the resistance of each arm will be

39 / 39

When an organic compound is dissolved in water, the attractive forces between the charged atom reduce tremendously and they are separated this is called.

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## All Questions and Answer of MRPL 21-feb-2021

• x/2
• x/2y
• 2x/y
• x/(x+y)

x/2

#### The ohm’s law deals with the relation between

• charge and resistance
• charge and capacity
• current and potential difference.
• capacity and potential difference.

current and potential difference.

#### Potential inside a hollow charged sphere is

• same as on its sphere
• greater than on its surface
• less than on its surface
• zero

same as on its sphere

#### Capacitance of a parallel plate capacitor decreases by

• increasing the area of plates
• increasing the distance between the plates
• putting a dielectric between the plates
• decreasing the distance between the plates
increasing the distance between the plates

• 1:2
• 2:1
• 3:2
• 2:3
1:2

#### The capacity of a cell depends upon

• Nature of plates material and electrolyte
• Sizes of the plates and the quality of electrolyte
• Both (A) and (B)
• None of the above
Sizes of the plates and the quality of electrolyte

#### When an organic compound is dissolved in water, the attractive forces between the charged atom reduce tremendously and they are separated this is called.

• Decomposition
• Deionisation
• Ionisation
• None of the above
Ionisation

#### Hysteresis loss in a magnetic material depends upon

• Area of hysteresis loop
• Frequency of reversed of field
• Volume of magnetic material
• All (A), (B) and (C)
All (A), (B) and (C)

• Voltage
• Resistance
• Current
• Power
Resistance

• 2R ohm
• 3R ohm
• 4R ohm
• R/2 ohm
3R ohm

• Maximum
• Before 50%
• Above 50%
• 50%
50%

#### An alternating quantity which attains its positive maximum value prior to the other is called the

• In phase quantity
• Lagging quantity
• None of the above

#### If a sinusoidal wave has frequency of 50 Hz with 15 ampere rms value. Which of the following equation represents?

• 15sin5Ot
• 30sin25t
• 42.42sin 100t
• 21.21sin314t
21.21sin314t

• 90°
• 30°
• 45°
45°

#### The shunt used in the millimetre

• Will extend the range and increases the resistance
• Will extend the range and decreases the meter resistance
• Will decrease the range and meter resistance
• Will decrease the range and increases the meter resistance
Will extend the range and decreases the meter resistance

#### A signal of 10mV at 75MHz is to be measured. Which of the following instruments can be used

• VTVM
• Cathode rayoscilloscope
• Moving iron voltmeter
• Digital multimeter

Cathode rayoscilloscope

#### The pressure coil of a dynamometer type wattmeter is

• Highly inductive
• Highly resistive
• Purely resistive
• Purely inductive
Highly resistive

#### The dc series motors are preferred for traction applications because

• The torque is proportional armature current
• The torque is proportional to the square root of armature current
• The torque is proportional to square of armature Current and the speed is inversely proportional to the torque.
• Torque and speed are inversely proportional to armature current
The torque is proportional to square of armature Current and the speed is inversely proportional to the torque.

#### What would happen if the field of d.c shunt motor is opened

• The speed of the motor will be reduced
• It will continue to run at its normal speed
• The speed of the motor becomes very high and may damage it.
• The current in the armature will decreases
The speed of the motor becomes very high and may damage it.

#### The eddy current loss in the transformers occurs in the

• Primary winding
• Core
• Secondary winding
• None of the above
Core

• 0.2 Amp
• 5 Amp
• 10 Amp
• 20 Amp
10Amp

#### The short circuit test in the transformers is performed to determine

• The iron loss at any load
• The hysteresis loss
• The eddy current loss

#### Regenerative method of braking is based on that

• Back emf is less than the applied voltage
• Back emf is equal to the applied voltage
• Back emf is more than the applied voltage
• None of the above
Back emf is more than the applied voltage

• Thermistor
• Thyristor
• Thyratron
• Transistor
Thyristor

#### Which of the following motors is most suitable for signaling devices and many kinds of timers

• d.c shunt motor
• d.c series motor
• Inductance motor
• Reluctance motor
Reluctance motor

#### Sparking at the commutators of a dc motor may result in

• Damage to the commutator’s segments
• Damage to the commutator’s insulation
• Increased power consumption
• All of the above
All of the above

According to Fleming’s right hand rule for finding the direction induced emf, when induced finger points in the direction of induced emf, forefinger will point the direction of

• Motion of conductor
• Lines offorce
• Either of the above
• None of the above
Lines offorce

#### The full load copper loss and iron loss of a transformer are 6400W and 5000W respectively the copper loss and iron loss at half load will be respectively.

• 3200W and 2500W
• 3200W and 5200W
• 1600W and 1250W
• 1600W and 5000W
1600W and 5000W

• 1000 rpm
• 960 rpm
• 750 rpm
• 720 rpm
720 rpm

#### The crawling in the induction motor Is caused by

• Improper design of stator lamination
• Low voltage supply
• Harmonics developed in motor
Harmonics developed in motor

#### The use of higher flux density in the transformer design

• Reduces the weight per kva
• Increases the weight per kva
• Has no relation with the weight of transformers
• Increases the weight per kw
Reduces the weight per kva

#### In hard-tool applications which one of the following single-phase motors is used

• Capacitor start motor
• Capacitor run motor
• AC series motor
AC series motor

#### What is the angle between the induced voltage and supply voltage of a synchronous motor under running generation?

• Zero
• Greater than zero but =< 90°
• Between 90° and 180°
• 180°
Greater than zero but =< 90°

#### How can reactive power delivered by a synchronous generator be controlled?

• By changing the prime moves input
• By changing the excitation
• By changing the direction of rotation
• By hanging the prime moves speed
By changing the excitation

#### When does a synchronous motor operate with leading power factor current?

• While it is under excited
• While it is critically excited
• While it is over excited
• While it is heavily loaded
While it is over excited

• 1/s
• s
• (1-s)
• s/(1-s)
s

• 2, 3 and 4
• 3 and 4
• 1, 2 and 3
• 1, 2 and 4
1, 2 and 4

#### The pressure at the furnace is minimum in case of

• Force draught system
• Induced draught system
• Balanced draught system
• Natural draught System
Balanced draught system

• Aluminium
• Cast iron