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DMRC JE/A.M 2018 Electrical Mini Mock 1

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Question 1

Which one of the following oscillators is well suited for the generation of wide range of audio-frequency sine waves?

Question 2

The amplifier circuit shown in the figure is an example of:

Question 3

Carbon brushes are preferable to copper brushes because…………………

Question 4

A transformer will work on………………….

Question 5

A transformer does not posses………………. Changing property.

Question 6

The armature of a d.c. machine is made of……………….

Question 7

A 4-pole, 50 Hz single-phase induction motor has a slip of 5%. The speed of the motor will be …………..

Question 8

A symmetrical fault occurs on a power system. The percentage reactance of the system on 2500 base kVA is 25%. If the full-load current corresponding to base kVA is 20A, then short-circuit current is

Question 9

An n-type silicon can be formed by adding impurity of:
1) Phosphorous
2) Arsenic
3) Boron
4) Aluminum
Which of the above are correct?

Question 10

If the drift velocity of holes under a field gradient of 200 V/m is 100 m/s, their mobility in SI units is

Question 11

Consider a semiconductor carrying current I and placed in a transverse magnetic field B, as shown below. The measured potential across 1 and 2 surfaces is positive at 2. What is the type of material?

Question 12

In low oil circuit breaker, the oil performs the function of

Question 13

The current rating of a fuse is 5 A. The fusing current will be

Question 14

An overcurrent relay having a current setting of 125% is connected to a supply circuit through a current transformer of ratio 400/5. The pick-up current is

Question 15

If the fault current is 2000 A, the relay setting 50% and C.T. ratio is 400/5 A, the P.S.M. is

Question 16

A triplex wave winding will have…………… parallel paths.

Question 17

The armature torque of a d.c. motor running at is and shaft torque is The iron and friction losses are

Question 18

The commutating-pole winding is connected in

Question 19

A 3-phase induction motor with a synchronous speed of develops 5 mechanical h.p. at What is the stator input if the stator loss is

Question 20

A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The supply frequency is 50 Hz. The slip of the motor is
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Jun 29ESE & GATE EE