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Electrical Engineering Quiz 47

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Electrical Engineering Quiz 47

1 / 50

The turn-on time of an SCR with inductive load is 20 ?s. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will___________?

2 / 50

The phase difference between the input and output voltages of a transistor connected in common emitter arrangement is___________?

3 / 50

The draught produced by chimney of given height at given outside temperature___________?

4 / 50

Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?

5 / 50

In case of the induction motors the torque is___________?

6 / 50

If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because__________________?

7 / 50

Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?

8 / 50

When the graph between current through and voltage across a device is a straight line, the device is referred to as _______________?

9 / 50

An AF amplifier is shielded to ________________?

10 / 50

The electrical power to a meggar is provided by________________?

11 / 50

Which of following is not a power transistor?

12 / 50

What is used to protect the SCR from over current ________________?

13 / 50

Which of the following parts of a transformer is visible from outside ?

14 / 50

The knee voltage of a crystal diode is approximately equal to ________________?

15 / 50

In a DC motor the inter-pole winding is connected in________________?

16 / 50

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of_________________?

17 / 50

The reflection co-efficient at the open circuited end of a transmission line___________?

18 / 50

In case the air gap in an induction motor is increased?

19 / 50

In a D.C. machine, the value of peripheral speed should not, normally, exceed___________?

20 / 50

Iron loss of a transformer can be measured by____________?

21 / 50

Which of the following motors are best for the rolling mills ?

22 / 50

Diversity factor has direct effect on the____________?

23 / 50

In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?

24 / 50

The advantage of using free ? wheeling diode in half controlled bridge converter is that

25 / 50

Which of the following characteristics should the line supports for transmission lines possess?

26 / 50

Transformer coupling provides high efficiency because___________?

27 / 50

A rotary converter operates at a______________?

28 / 50

In lap winding, the number of brushes is always_____________?

29 / 50

Skin effect occurs when a conductor carries current at_______ frequencies

30 / 50

In a capacitive circuit___________?

31 / 50

D.C. generators are normally designed for maximum efficiency around_____________?

32 / 50

For three-phase induction motors which of the following is the least efficient method of speed control ?

33 / 50

Aluminium has a specific gravity of___________?

34 / 50

These days D.C. motors are widely used in____________?

35 / 50

The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?

36 / 50

One kilowatt hour is equal to_________?

37 / 50

Which of the following circuit breakers has high reliability and minimum maintenance ?

38 / 50

The active components in an IC are _______________?

39 / 50

Superconducting metal in super conducting state has relative permeability of________________?

40 / 50

A series generator can self-excite:______________?

41 / 50

Synchronous motors are_____________?

42 / 50

The frequency of voltage generated, in case of generators, can be increased by___________?

43 / 50

The ground wire should not be smaller than No _________ copper

44 / 50

In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?

45 / 50

The efficiency of a properly designed synchronous motor will usually fall in range___________?

46 / 50

Emitter follower is used for ________________?

47 / 50

A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

48 / 50

Tuned class C amplifiers are used for RF signals of________________?

49 / 50

When current feedback (negative) is applied to an amplifier, its output impedance ________________?

50 / 50

48 ampere-hour capacity would deliver a current of___________?

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