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Electrical Engineering Quiz 19

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Electrical Engineering Quiz 19

1 / 50

Reduction in core losses and increase in permeability are obtained with transformer employing__________?

2 / 50

To produce cathode spot in a mercury arc rectifier______________?

3 / 50

The voltage drop at anode, in a mercury arc rectifier is due to_____________?

4 / 50

The main reason for generation of harmonics in a transformer could be_______________?

5 / 50

The hfe parameter is called ______________in CE arrangement with output shorted?

6 / 50

The voltage drop, for constant voltage transmission is compensated by installing__________?

7 / 50

COOLMOS device can be used in application up to power range of___________?

8 / 50

For driving high inertia loads best type of induction motor suggested is_____________?

9 / 50

An ideal OP-AMP is an ideal______________?

10 / 50

The corona is considerably affected by which of the following _______________?

11 / 50

have maximum unbalanced forces_______________?

12 / 50

Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?

13 / 50

Which of the following is the demerit of a ?constant voltage transmission system? ?

14 / 50

In the SPWM, the modulating signal is___________?

15 / 50

A 5 ?F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?

16 / 50

The ampere-hour efficiency of a lead acid cell is normally between_________?

17 / 50

The thermal conductivity of hydrogen is _____________ times that of air?

18 / 50

A silicon transistor is biased with base resistor method. If ?=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB ?

19 / 50

Modulation refers to a low-frequency signal controlling the ________________?

20 / 50

Which of the following plants is almost inevitably used as base load plant?

21 / 50

The same signal in Problem 2 is applied to an RC high-pass filter. If the reactance is zero at the input frequency, the output voltage is____________?

22 / 50

In an LC oscillator, the frequency of oscillator is____________L or C?

23 / 50

Which is the most superior dielectric out of the following ?

24 / 50

In the transformer the function of a conservator is to_______________?

25 / 50

An ideal OP-AMP is an ideal___________?

26 / 50

Multicore cables generally use________________?

27 / 50

Which of the following happens in Kando system ?

28 / 50

The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?

29 / 50

A commutating rectifier consists of commutator driven by___________?

30 / 50

An H.R. fuse is_______________?

31 / 50

Class_____________ power amplifier has the highest collector efficiency ?

32 / 50

Single phase VSI are mainly used in___________?

33 / 50

The type 1 system has _________ at the origin?

34 / 50

If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?

35 / 50

The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?

36 / 50

An oscillator differs from an amplifier because it_____________?

37 / 50

The early effect in a bipolar junction transistor is caused by_______________?

38 / 50

The voltage regulation in magnetic amplifier type voltage regulator is effected by__________?

39 / 50

When both the inductance and resistance of a coil are doubled the value of________________?

40 / 50

Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?

41 / 50

Temperature of the stator winding of a three phase induction motor is obtained by___________?

42 / 50

_____________ filter circuit results in the best voltage regulation?

43 / 50

Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?

44 / 50

Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?

45 / 50

In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is________________?

46 / 50

Which of the following is the unit of magnetic flux density ?

47 / 50

power plant is expected to have the longest life?

48 / 50

As the modulation level is increased, the carrier power__________________?

49 / 50

In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies

50 / 50

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as__________?

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