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Electrical Engineering Quiz 35

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Electrical Engineering Quiz 35

1 / 50

An SCR is a solid state equivalent of ______________?

2 / 50

In a non-uniform electric field a polar molecule will experience____________?

3 / 50

Wagner earthing device is used to eliminate errors due to________________?

4 / 50

Magnitude of current at resonance in R-L-C circuit________?

5 / 50

When the armature of a D.C. motor rotates, e.m.f. induced is___________?

6 / 50

D.C. series generator is used_________________?

7 / 50

Extent of corrosion in the underground metal work depends upon___________?

8 / 50

In a particular biasing circuit, the value of RE is about _________________?

9 / 50

How can we protect SCR from thermal conditions _____________?

10 / 50

Transformer coupling can be used in______________amplifiers?

11 / 50

Double edge modulation eliminates certain harmonics when the reference is a__________?

12 / 50

Batteries are charged by_____________?

13 / 50

If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ______________?

14 / 50

Which of following devices has highest di/dt and dv/dt capability?

15 / 50

When either L or C is increased, the resonant frequency of LC circuit ____________?

16 / 50

Which of the following is not a vector ___________?

17 / 50

A transistor amplifier has high output impedance because ______________?

18 / 50

Most common form of A.C. meters met with in every day domestic and industrial installations are______________?

19 / 50

Which of the following battery is used for air-craft _____________?

20 / 50

In a single phase rotary converter the number of slip rings will be_____________?

21 / 50

Overfluxing protection is recommended for_____________?

22 / 50

A zener diode is always_______________ connected?

23 / 50

If a shunt motor is started with its field winding open then?

24 / 50

An OPAMP has a slew rate of 5 V/? S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/?S.

25 / 50

Instrument transformers are_______________?

26 / 50

An n- channel JFET has IDSS=2mA,and Vp=-4v.Its transconductance gm=in mA/V)for an applied gate to source voltage VGS=-2v is___________?

27 / 50

The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?

28 / 50

In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?

29 / 50

Which of the following methods of heating is not dependent on the frequency of supply ?

30 / 50

Burning out of winding is due to___________?

31 / 50

Energy stored by a coil is doubled when its current is increased by percent___________?

32 / 50

Dielectric strength of mica is___________?

33 / 50

The starting resistance of a D.C. motor is generally_______________?

34 / 50

For testing appliances, the wattage of test lamp should be_____________?

35 / 50

A capacitor is a perfect insulator for______________?

36 / 50

The thickness of insulation provided on the conductor depends on_____________?

37 / 50

In a substation the following equipment is not installed?

38 / 50

Short-circuiter is used in_____________?

39 / 50

The maximum torque in an induction motor depends on___________?

40 / 50

If a D.C. motor is connected across the A.C. supply it will_______________?

41 / 50

Which of the following is the disadvantage of static capacitor for power factor improvement?

42 / 50

The winding where dummy coils are used is sometimes called______________?

43 / 50

An SCR is considered to be a semi controlled device because_______?

44 / 50

By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

45 / 50

Sumpner?s test is conducted on transformers to determine_____________?

46 / 50

In a control system integral error compensation _________________ steady state error?

47 / 50

In jaw crushers a motor has to often start against ____________________ load?

48 / 50

Which of the following heating methods has maximum power factor ?

49 / 50

The material generally used for armour of high voltage cables is_____________?

50 / 50

Thermal overload relays are used to protect the motor against over current due to____________?

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