1. Megger is an instrument by which we can measure ?
...
Answer is A)
The Megger is the instrument uses for measuring the resistance of the insulation. It works on the principle of comparison, i.e., the resistance of the insulation is compared with the known value of resistance. The accuracy of the Megger is high as compared to other instruments.
2. A voltage divider circuit and its Thevenin's equivalent are shown below. The
values of Vth and Rth will be ?
...
Answer is C) Watch the Video.
3. Two coils with self-inductance 1 H and 2 H having a mutual inductance of 1 H
between them carry currents of 2 A and 2 A respectively. The total energy stored in the
field, in joules, is ?
...
Answer is B) Watch the Video.
4. In dynamometer wattmeter the compensation coil ?
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Answer is B) Watch the Video.
5. A wattmeter is being tested under phantomloading condition. If the wattmeter
reading is 60 W, the actual power consumed from the supply, is ?
...
Answer is C) Watch the Video.
6. In an induction type energy meter, everything else remaining same, if the radial
distance of the brake magnet poles from the spindle is decreased by 10%, the rotational
speed of the disc will _____ approximately ?
...
Answer is D) Watch the Video.
7. In the circuit shown in the figure given below, instantaneous current i(t) under
steady state is given by ?
...
Answer is A) Watch the Video.
8. The V – I relation for the network shown in the given box is V = 4I – 9. If now a
resistor R = 2 Ω is connected across it, then the value of I will be ?
...
Answer is C) Watch the Video.
9. With the decrease in the strength of the permanent magnet in an insulation Megger
due to ageing, the Megger reading will ?
...
Answer is A) Watch the Video.
10. Guard electrodes are used in capacitance measurement to minimize ?
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Answer is C) Watch the Video.
11. The burden of current transformers is expressed in ?
...
Answer is B) Watch the Video.
12. Voltage regulation of an alternator may be negative where ?
...
Answer is B) Watch the Video.
13. A static combination of control coil and compen-sating coil is used in Megger to
minimize the effect of ?
...
Answer is C) Watch the Video.
14. Megger is an instrument used for measurement of ?
...
Answer is A) Watch the Video.
15. Power transformers are designed such that maximum efficiency occurs at ?
...
Answer is B) Watch the Video.
16. The brushes of a D.C. machine should be physically placed on the D.C. ?
...
Answer is B) Watch the Video.
17. In Swinburne's method of testing D.C. machines, the shunt machine is run as a
D.C. ?
...
Answer is D) Watch the Video.
18. A 20 kVA, 2000 V/ 200 V, 2-winding transformer, when used as an autotransformer
with constant voltage source of 2000 v, is capable of handing ?
...
Answer is B) Watch the Video.
19. The ratio of no load current to full load current of a single phase induction
motor ?
...
Answer is A) Watch the Video.
20. Which one of the following is correct ?
...
Answer is D) Watch the Video.
21. During starting of a three-phase induction motor, the machine may refuse to start
at all. This phenomenon is called ?
...
Answer is B) Watch the Video.
22. V-curves for isolated, 3-phase synchronous motor show ?
...
Answer is D) Watch the Video.
23. A dc shunt generator is delivering 500 A at 220 V. the shunt field current is 10
A. The armature resistance is 0.01 Ω. The stray power is 5000 W. The efficiency of the
generator is ?
...
Answer is C) Watch the Video.
24. A single phase radial distributor is fed at one end at 220 V and is loaded with
unity power factor loads as under:
If the total resistance for go and return of the distributor is 0.1 Ω, the voltage at
the far end is ?
...
Answer is A) Watch the Video.
25. The capacity factor of a plant is given by ?
...
Answer is C) Watch the Video.
26. In a power supply system, "demand factor" is defined as ?
...
Answer is D) Watch the Video.
27. A fault involving all the three phases of a power system is known as ?
...
Answer is B) Watch the Video.
28. Two generators each of capacity 10 MVA and reactance 5% are feeding a common bus
bar. A transmission line of reactance 2.5% is connected with the bus bar to transmit
power to the consumer end. The contribution of each generator to a three-phase fault at
the consumer end is ?
...
Answer is B) Watch the Video.
29. In the Merz-Price system of protection of alternator, if i1 and i2 are the CT
secondary currents, and nr and no are the number of restraining coils and operating
coils respectively, then the torque-balance equation is ?
...
Answer is D) Watch the Video.
30. The presence of earth in case of overhead lines ?
...
Answer is A) Watch the Video.
31. In arc welding, the voltage required to maintain the arc is in the range of ?
...
Answer is D) Watch the Video.
32. In designing lighting scheme, utilization factor is used. It is defined as ?
...
Answer is A) Watch the Video.
33. Which of the following equipments has the lowest power factor ?
...
Answer is D) Watch the Video.
34. At
times of peak loads, a power system needs ?
...
Answer is A) At times of peak loads, which are mainly lagging power factor loads, the power system needs injection of lagging VAR’s.
35. Low head plants generally use ?
...
Answer is C) Watch the Video.
36. The mmf produced by interpole is proportional to ?
...
Answer is B) Watch the Video.
37. During arcing ground
conditions, the phase voltage of the system rises to ?
...
Answer is D) Watch the Video.
38. Location of
lighting arrester should be near a ?
...
Answer is B) Watch the Video.
39. Isolators are capable of
breaking ?
...
Answer is D) Watch the Video.
40. An equipment has an impedance of
0.9 p.u. to a base of 20 MVA, 33 kV. To the base of 50 MVA, 11 kV,
the p.u. impedance will be ?
...
Answer is D) Watch the Video.
41. In a system, if the base load is the
same as the maximum demand, the load factor will be ?
...
Answer is A) Watch the Video.
42. The recovery voltage that appears across the circuit breaker
contacts will be maximum for power factor of ?
...
Answer is A) Watch the Video.
43. The sag of the conductors of a transmission line is
2.5 m when the span is 250 m. Now if the height of the supporting
towers is increased by 2.5%, the sag will ?
...
Answer is D) Watch the Video.
44. The
colour of light emitted by sodium vapour discharge lamp when glowing
steadily, is ?
...
Answer is B) Watch the Video.
45. Match the items in List I with those of List II and select your
answers using the codes given in the lists: ?
...
Answer is A) Watch the Video.
46. If t
is the thickness of the sheet, the tip diameter for spot welding is
usually ?
...
Answer is A) Watch the Video.
47. Which of the following surface has the lowest reflection factor
for white light ?
...
Answer is C) Watch the Video.
48. The
inner surface of a fluorescent tube is coated with a fluorescent
material which ?
...
Answer is A) Watch the Video.
49. A transistor has a current
gain of 0.99 in common base mode ?
...
Answer is B) Watch the Video.
50. In arc
welding, once the arc is struck, the voltage required to maintain it
will be ?
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