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Electrical Engineering Quiz 68

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Electrical Engineering Quiz 68

1 / 50

A semiconductor has ______________ temperature coefficient of resistance?

2 / 50

In a cable capacitor, voltage gradient is maximum at the surface of the______________?

3 / 50

In single core cables armouring is not done to________?

4 / 50

A voltmeter is connected in a _____________ with the circuit component across which potential difference is to be measured?

5 / 50

A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of__________?

6 / 50

_____________ has the lowest noise-level?

7 / 50

Due to which of the following reasons copper and aluminium are not used for heating elements ?

8 / 50

If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?

9 / 50

?In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch?. In thermal power plant, heat from the flue gases is utilized in___________?

10 / 50

A universal motor is one which______________?

11 / 50

In case of a shaded pole motor the direction of rotation of the motor is__________?

12 / 50

A source follower using an FET usually has a voltage gain which is___________?

13 / 50

Reheat cycle in steam power plant is used to________________?

14 / 50

If a battery is wrongly connected on charge following will happen__________?

15 / 50

Systematic errors are_________________?

16 / 50

___________________is not a part of ball bearing ?

17 / 50

The point of intersection of d.c. and a.c. load lines is called________________?

18 / 50

Solder is an alloy of______________?

19 / 50

The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?

20 / 50

BC 147 transistor indicates that it is made of____________?

21 / 50

Which of the following statement is incorrect ?

22 / 50

Arc in a circuit breaker is interrupted at___________?

23 / 50

__________ instruments are those which measure the total quantity of electricity delivered in a particular time ?

24 / 50

The dielectric strength of transformer oil is expected to be______________?

25 / 50

A Buchholz relay can be installed on

26 / 50

In squirrel cage induction motors which of the following methods of starting cannot be used ?

27 / 50

The relation between ? and a is______________?

28 / 50

Which of the following power plant usually offer highest maintenance cost___________?

29 / 50

The commutator segments are connected to the armature conductors by means of___________?

30 / 50

If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be_______________?

31 / 50

In a base resistor method, if the value of ? changes by 50, then collector current will change by a factor ___________________?

32 / 50

The disadvantage with paper as insulating material is____________?

33 / 50

If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?

34 / 50

Which plant can never have 100 percent load factor?

35 / 50

Which of the following is the commonly used type of electromagnets ?

36 / 50

During the commutation period in 3 phase converter, overlap time is____________?

37 / 50

Which of the following motors is preferred for traction work ?

38 / 50

The normal way to turn on a SCR is by______________?

39 / 50

The operating voltage of a meggar is about_______________?

40 / 50

What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?

41 / 50

A nichrome wire used as a heater coil has the resistance of 2 ?2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?

42 / 50

Which motor is preferred for use in mines where explosive gases exist ?

43 / 50

For electroplating we use_________________?

44 / 50

When current flows through heater coil it glows but supply wiring does not glow because______________?

45 / 50

relay is preferred for phase fault on short transmission line?

46 / 50

In main line service as compared to urban and suburban service______________?

47 / 50

If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least___________________?

48 / 50

In regenerative cycle feed water is heated by_____________?

49 / 50

A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?

50 / 50

What is true about the breakdown voltage in a Zener diode ?

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