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Electrical Engineering Quiz 70

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Electrical Engineering Quiz 70

1 / 50

Air will not be the working substance in which of the following?

2 / 50

If three 10 uF capacitors are connected in parallel, the net cararitance is___________?

3 / 50

A D.C. generator can be considered as____________?

4 / 50

The under voltage relay can be used for______________?

5 / 50

Helical windings are used in________________?

6 / 50

Susceptibility is positive for______________?

7 / 50

For increasing the voltage rating, zeners are connected in_____________?

8 / 50

In case of 3-phase induction motors, plugging means__________?

9 / 50

Direct water cooling of rotor winding presents_____________?

10 / 50

Most of the common metals have _________ structure?

11 / 50

The speed of a locomotive is controlled by_______________?

12 / 50

A zener diode has ______________ breakdown voltage?

13 / 50

The e.m.f. generated by a shunt wound D.C. generator is

14 / 50

The inductance of a coil can be increased by_________?

15 / 50

Alternating current is measured by_______________?

16 / 50

The multiplier and the meter coil in a voltmeter are in________________?

17 / 50

The lines of force due to charged particles are_________?

18 / 50

In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?

19 / 50

The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?

20 / 50

ON state voltage drop across SCR lie between the range_____________?

21 / 50

As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit____________________?

22 / 50

In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be______________?

23 / 50

The upper or lower cut off frequency is also called______________frequency?

24 / 50

Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?

25 / 50

An ideal transformer will have maximum efficiency at a load such that?

26 / 50

Most of the high transmission lines in Pakistan are_______________?

27 / 50

Aphasoris________?

28 / 50

If the gate voltage of an SCR is removed, then the_______________?

29 / 50

When negative voltage feedback is applied to an amplifier, its voltage gain ____________?

30 / 50

For proper amplification by a transistor circuit, the operating point should be located at the_____________ of the d.c. load line?

31 / 50

In ________________ method of staging three phase induction motors the starting voltage is not reduced?

32 / 50

Which of the following motors has highest starting torque ?

33 / 50

Hartley oscillator is commonly used in______________?

34 / 50

The adjustment of position of shading bands, in an energy meter is done to provide______________?

35 / 50

When two D.C. generators are running in parallel an equilizer bar is used______________?

36 / 50

Dielectric strength _________ with increasing thickness

37 / 50

The maximum firing angle in the half wave controlled regulator is_____________?

38 / 50

In differential-mode, ______________?

39 / 50

The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?

40 / 50

The size of a transformer core will depend on__________?

41 / 50

High load factor indicates

42 / 50

A differentiating circuit is a simple RC circuit with output taken across ____________?

43 / 50

A certain inverting amplifier has a closed-loop voltage gain of 25. The Op-amp has an open-loop voltage gain of 100,000. If an Op-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain________________?

44 / 50

Which of the following are non-conductors of electricity?

45 / 50

At low value of power factor, the cost of generation of a power station will be____________?

46 / 50

In a series circuit with unequal resistances______________?

47 / 50

The efficiencies of transformers compared with that of electric motors of the same power are____________?

48 / 50

AC power in a load can be controlled by using____________?

49 / 50

When a transmission line is energized, the wave that propagates on it is____________?

50 / 50

Following motor is used where high starting torque and wide speed range control is required?

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