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Electrical Engineering Quiz 45

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Electrical Engineering Quiz 45

1 / 50

If the a.c. input to a half-wave rectifier is an r.m.s value of 400/?2 volts, then diode PIV rating is__________________?

2 / 50

The chemical used in breather is_______________?

3 / 50

DOL starting of induction motors is usually restricted to_____________?

4 / 50

A GTO can be turned on by applying___________?

5 / 50

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________?

6 / 50

In order to increase the damping of a badly underdamped system which of following compensators may be used ?

7 / 50

The encapsulation of transistor is necessary for__________?

8 / 50

A control system with excessive noise, is likely to suffer from_______________?

9 / 50

Speed control by Ward Leonard method gives uniform speed variation_____________?

10 / 50

In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?

11 / 50

The power transformer is a constant______________?

12 / 50

A paper capacitor is usually available in the form of_____________?

13 / 50

The multivibrator which generates square wave of its own is the ____________multivibrator?

14 / 50

The most inexpensive switch is _____________ switch?

15 / 50

Any electrical signal present in a circuit other than the desired signal is known as______________?

16 / 50

A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?

17 / 50

The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?

18 / 50

The total losses in a well designed D.C. generator of 10 kW will be nearly______________?

19 / 50

A crystal diode has forward resistance of the order of ________________?

20 / 50

Relays can be designed to respond to changes in________________?

21 / 50

A short-circuit is identified by_____________?

22 / 50

A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ______________?

23 / 50

An SCR behaves as a____________switch?

24 / 50

A power transformer is usually rated in____________?

25 / 50

When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?

26 / 50

The pulsating d.c. applied to power amplifier causes________________?

27 / 50

An over-excited synchronous motor takes__________?

28 / 50

If the operating point changes, the h parameters of transistor_____________?

29 / 50

A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?

30 / 50

A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?

31 / 50

On which of the following factors skin effect depends?

32 / 50

Which one of the following is not the function of pole shoes in a D.C. machine ?

33 / 50

The ratio of output impedance of a CE amplifier is _______________?

34 / 50

Emitter follower is a _______________circuit?

35 / 50

A laminated iron core has reduced eddy-current losses because____________?

36 / 50

A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as_________?

37 / 50

Under normal charging rate, the charging current should be__________?

38 / 50

An instrument which detects electric current is known as_____________?

39 / 50

Digital computers are more widely used as compared to analog computers, because they are______________?

40 / 50

The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC will be___________?

41 / 50

An integrating circuit is a simple RC series circuit with output taken across ______________?

42 / 50

The maximum di/dt in a SCR is____________?

43 / 50

Which of the following does not change in a transformer ?

44 / 50

A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor______________?

45 / 50

In the analysis of which of the following lines shunt capacitance is neglected?

46 / 50

By the use of which of the following m D.C. can be obtained from AC ?

47 / 50

It is generally desired that a transistor should have_____________________ input impedance?

48 / 50

_______________is an open loop control system?

49 / 50

For a D.C. shunt motor which of the following is incorrect ?

50 / 50

How many op-amps are required to implement this equation Vo = V1?

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