Electrical Engineering Quiz 58

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Electrical Engineering Quiz 58

1 / 50

Arc in a circuit behaves as_______________?

2 / 50

Electrical machines having a power output up to about 750 W may be called__________machines?

3 / 50

Negative feedback is employed in __________________?

4 / 50

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

5 / 50

Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials

6 / 50

The unit of reluctance is_____________?

7 / 50

A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?

8 / 50

Due to which of the following fact, in India, aluminium is replacing copper ?

9 / 50

When a pentavalent impurity is added to a pure semiconductor, it becomes________________?

10 / 50

A crystal diode has______________?

11 / 50

For an SCR gate – cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance_____?

12 / 50

The source terminal of a JEFT corresponds to _____________ of a vacuum tube?

13 / 50

The field coils of D.C. generator are usually made of_____________?

14 / 50

Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?

15 / 50

A hole and electron in close proximity would tend to________________?

16 / 50

A control system in which the control action is somehow dependent on the output is known as____________?

17 / 50

In series motor which of the following methods can be used for changing the flux per pole ?

18 / 50

Constant voltage transmission entails the following disadvantage?

19 / 50

In cables the charging current__________?

20 / 50

ICs are used in ______________?

21 / 50

An automatic toaster is a ___________ loop control system?

22 / 50

For the same peak value which of the following wave will ?have the highest r.m.s. value?

23 / 50

Which of the following motors is used for elevators ?

24 / 50

A condenser suitable for D.C. only is________?

25 / 50

If an electrons is allowed to move along the field in a non uniform electric field then it will follow__________________?

26 / 50

In D.C. generators on no-load, the air gap flux distribution in space is______________?

27 / 50

The voltage gain of an emitter follower is _____________?

28 / 50

A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is______________?

29 / 50

Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity

30 / 50

Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________?

31 / 50

The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?

32 / 50

The superhetrodyne principle provides selectivity at ______________stage?

33 / 50

In steam turbines the reheat factor_____________?

34 / 50

In an electric press mica is used_____________?

35 / 50

Series motor is not suited for traction duty due to which of the following account ?

36 / 50

Inductance of coil___________?

37 / 50

The power mentioned on the name plate of an electric motor indicates____________?

38 / 50

Form factor for a sine wave is________?

39 / 50

The input impedance of a JFET is _____________that of an ordinary transistor?

40 / 50

A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density when the radius of the coil increases from r1 to r2 in time ?t then what is the emf induced in the coil ?

41 / 50

In TV transmission, sound signal is ______________modulated?

42 / 50

Which of the following happens when star-delta starter is used ?

43 / 50

When a transistor is connected in common emitter mode, it with have__________?

44 / 50

At 100% modulation, the power in each sideband is _____________ of that of carrier?

45 / 50

Overload capacity of diesel engines is usually restricted to_______________?

46 / 50

A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8 The potential on its surface will be_________________?

47 / 50

When load on an over-excited or under excited synchronous*motor is increased, rate of change of its armature current as compared with that of power factor is___________?

48 / 50

A voltage follower _____________?

49 / 50

Spring constant in force-voltage analogy is analogous to_____________?

50 / 50

The PIV rating of a crystal diode is _______________ that of equivalent vacuum diode

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