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Electrical Engineering Quiz 43

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Electrical Engineering Quiz 43

1 / 50

For an integrating circuit to be effective , the RC product should be____________ the time period of the input wave?

2 / 50

A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be_____________?

3 / 50

A unit tube of flux is known as tube___________?

4 / 50

In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be___________?

5 / 50

A constant-voltage generator has___________?

6 / 50

An SCR has ___________semiconductor layers?

7 / 50

In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?

8 / 50

An ideal OP-AMP is an ideal__________?

9 / 50

Which of the following quantities consists of SI unit as WATT ?

10 / 50

In a CE amplifier, voltage gain =____________________ x RAC/Rin?

11 / 50

The size of a power transistor is made considerably large to________________?

12 / 50

The voltage of the single phase supply to residential consumers is_____________?

13 / 50

Which of the following is the loss within the mercury arc rectifier chamber ?

14 / 50

A direct on line starter is used: for starting motors___________?

15 / 50

In a 3-phase synchronous motor, the negative phase sequence exists when the motor is_______________?

16 / 50

An SCR has __________ pn junctions?

17 / 50

IC = [a / (1 ? a )] IB + [___________ / (1 ? a )?

18 / 50

A non-dimensional number generally associated with natural convection heat transfer is____________?

19 / 50

DIAC are specifically designed to trigger______________?

20 / 50

At cut-off, the JFET channel is _____________?

21 / 50

A MOSFET differs from a JFET mainly because _________________?

22 / 50

Out of the following which is an insulating material____________?

23 / 50

Farad is the unit of___________?

24 / 50

In case of D.C. shunt motors the speed is dependent on back e.m.f. only because____________?

25 / 50

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will__________?

26 / 50

In D.C. machines the residual magnetism is of the order of_________________?

27 / 50

The short circuit in any winding of the transformer is the result of______________?

28 / 50

A transformer can have regulation closer to zero___________?

29 / 50

The weight of copper of both armature and field windings decreases with __________ in number of poles?

30 / 50

A voltage of about 200 V can be measured__________________?

31 / 50

The metal having the lowest temperature coefficient of resistance is_________________?

32 / 50

A good control system has all the following features except_____________?

33 / 50

A Triac is a ______________?

34 / 50

Satisfactory commutation of D.C. machines requires______________?

35 / 50

The current drawn by the line due to corona losses is___________?

36 / 50

An efficient and a well designed protective relaying should have_____________?

37 / 50

The unit of resistivity is

38 / 50

A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?

39 / 50

Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules_______________?

40 / 50

If one-phase of a 3-phase synchronous motor is short-circuited, motor will ______________?

41 / 50

Stability of a synchronous machine:

42 / 50

A Wheatstone bridge can be used to determine an unknown_____________?

43 / 50

Power transformers have rating_______________?

44 / 50

Which of the following equipment provides fluctuating load?

45 / 50

Electric flux linked with a surface will be maximum when____________?

46 / 50

Which of the following is used in SCR to protect from high dV / dt__________________?

47 / 50

Equilizer rings are required in case armature is_______________?

48 / 50

In a meggar controlling torque is provided by______________?

49 / 50

Which of the following motors has two separate windings on the motor ?

50 / 50

If level of modulation is increased ______________ power is increased?

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