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Electrical Engineering Quiz 40

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Electrical Engineering Quiz 40

1 / 50

In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?

2 / 50

The term ?cogging? is associated with___________?

3 / 50

In a pure resistive circuit__________?

4 / 50

An amplifier without feedback has a voltage gain of 50,input resistance os 1 K? & Output resistance of 2.5K?.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?

5 / 50

The delay fuses are used for the protection of ___________?

6 / 50

If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?

7 / 50

Dynamic equalising circuit is useful____________?

8 / 50

For which of the following protection from negative sequence currents is provided ?

9 / 50

A current amplification of 2000 is a gain of_________________?

10 / 50

The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?

11 / 50

A switch has ______________?

12 / 50

The motor used on small lathes is usually_________?

13 / 50

Dielectric strength of medium____________?

14 / 50

In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?

15 / 50

For an overhead line, the surge impedance is taken as________________?

16 / 50

Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?

17 / 50

In CE arrangement, the value of input impedance is approximately equal to ______________?

18 / 50

The surge resistance of cable is__________?

19 / 50

The ac voltage controller can be used for ___________?

20 / 50

Very large values of modulation index (greater than 3.24) lead to___________?

21 / 50

Which of the following can be measured by the use of a tachogenerator ?

22 / 50

Magnetic field in a D.C. generator is produced by_______________?

23 / 50

Murray loop test can be used for location of________________?

24 / 50

The rupture of co-valent bonds will occur when the electric field is__________________?

25 / 50

The length cf air gap to be provided in __________ is primarily determined by power factor consideration?

26 / 50

Effect of moisture on the insulating materials is to________________?

27 / 50

An emitter follower has ______________input impedance?

28 / 50

Electric current passing through the circuit produces_____________?

29 / 50

Conductance : mho :: ____________?

30 / 50

Capacitive susceptance is a measure of__________?

31 / 50

Basically a potentiometer is a device for________________?

32 / 50

The series field of a short-shunt D.C. generator is excited by_______________?

33 / 50

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

34 / 50

A Weston frequency meter is_____________?

35 / 50

In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?

36 / 50

When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?

37 / 50

The power demand can be estimated approximately by____________?

38 / 50

method has leading power factor____________?

39 / 50

Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?

40 / 50

Voltage Series feedback also called series-shunt feedback) results in__________?

41 / 50

The lead-acid cell should never be discharged beyond____________?

42 / 50

On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?

43 / 50

1 db corresponds to_____________change in voltage or current level?

44 / 50

A series resonant band-pass filter consists of a 2 mH coil, a 0.005 ?F capacitor, and a 120 ? resistor. The winding resistance of the coil is 12 ?. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?

45 / 50

When a transistor is driven to cut off, ideally the output is _______________?

46 / 50

The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?

47 / 50

The input resistance of a VTVM is about ______________?

48 / 50

A fuse is never inserted in____________?

49 / 50

Power amplifiers generally use transformer coupling because transformer permits______________?

50 / 50

need frequent starting and stopping of electric motors ?

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