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Electrical Engineering Quiz 21

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Electrical Engineering Quiz 21

1 / 50

The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is______________?

2 / 50

A common-mode signal is applied to ________________?

3 / 50

The efficiency of two identical transformers under load conditions can be determined by_______________?

4 / 50

In a cable immediately above metallic sheath ______ is provided

5 / 50

The resistance of an ideal voltmeter is ______________?

6 / 50

For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor?

7 / 50

SI unit of the permittivity of free space is________________?

8 / 50

In a transistor ______________?

9 / 50

The sensitivity of a multimeter is given in _______________?

10 / 50

A hole in a semiconductor is defined as_________________?

11 / 50

The square root of the ratio of line impedance and shunt admittance is called the___________?

12 / 50

A single stage transistor amplifier with collector load RC and emitter resistance RE has a d.c. load of ________________________?

13 / 50

In a capacitor start motor, the phase displacement between starting and running winding can be nearly__________?

14 / 50

Which of the following is the major consideration to evolve a good design ?

15 / 50

The speed of a superfast train is______________?

16 / 50

The Biot-savart?s law is a general modification of_______________?

17 / 50

The operating speed of a synchronous motor can be changed to new fixed value by___________?

18 / 50

Which of the following devices may be used for extending the range of instruments ?

19 / 50

Which one of the following can be taken as the measure of electric intensity ?

20 / 50

Short circuiting of a cell may be caused____________?

21 / 50

The transition temperature of mercury is____________?

22 / 50

A turbine is tripped when ?

23 / 50

A capacitor is generally a____________?

24 / 50

A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?

25 / 50

By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?

26 / 50

The speed of a D.C. shunt motor can be increased by_______________?

27 / 50

The speed of a D.C. series motor is_____________?

28 / 50

An ideal value of stability factor is________________?

29 / 50

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?

30 / 50

The hysteresis loss in a D.C. machine least depends on____________?

31 / 50

Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________?

32 / 50

A resonant circuit contains ____________elements?

33 / 50

The materil used to coat inside the face of CRT is ______________?

34 / 50

A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?

35 / 50

In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?

36 / 50

A fuse is connected_______________?

37 / 50

An SCR is sometimes called ____________?

38 / 50

Which of the following motors is preferred when quick speed reversal is the main consideration ?

39 / 50

In the case of a lossy capacitor, its series equivalent resistance value will be_______________?

40 / 50

The maximum speed variation in a 3-phase synchronous motor is____________?

41 / 50

Which quantity should be measured by the voltmeter ?

42 / 50

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?

43 / 50

One newton meter is same as_____________?

44 / 50

Millman?s theorem yields____________?

45 / 50

In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output

46 / 50

The voltage induced in an inductor is represented as,

47 / 50

Demand factor is defined as___________?

48 / 50

The maximum collector efficiency of class B operation is ________________?

49 / 50

Cylindrical windings using circular conductors, employed in transformers, are_____________?

50 / 50

The fuse rating is expressed in terms of_____________?

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