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Electrical Engineering Quiz 61

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Electrical Engineering Quiz 61

1 / 50

If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in_________?

2 / 50

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?

3 / 50

For germanium the forbidden energy gap is_______________?

4 / 50

Which of the following is an advantage of heating by electricity ?

5 / 50

_____________is not a final control element?

6 / 50

A balanced Wheatstone bridge consists of an RV of 3,500 ?, an R2 of 200 ?, and an R3 of 680 ?. The value of RUNK is____________?

7 / 50

Which of these is the best description for a Zener diode ?

8 / 50

An ideal traction system should have_______________?

9 / 50

With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3?

10 / 50

D.C. generator generally preferred for charging automobile batteries is______________?

11 / 50

Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?

12 / 50

To avoid formation of grooves in the commutator of a D.C. machine?

13 / 50

In thermal-electrical analogy charge is considered analogous to_______________?

14 / 50

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then____________?

15 / 50

The secondary winding of which of the following transformers is always kept closed?

16 / 50

Reciprocal of reluctance is_______________?

17 / 50

Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?

18 / 50

Change of D.C. excitation of a synchronous motor changes:

19 / 50

In Ward-Leonard control the lower limit of speed is imposed by________?

20 / 50

All good conductors have high____________?

21 / 50

A substance whose molecules consist of dissimilar atoms is called____________?

22 / 50

The power factor of an induction motor under no-load conditions will be closer to_____________?

23 / 50

The value of stability factor for a base resistor bias is________________?

24 / 50

An RC high-pass filter consists of an 820 ? resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz?

25 / 50

Which D.C. motor has got maximum self relieving property ?

26 / 50

In order that a hydrometer may float vertically in electrolyte its C.G. should be___________?

27 / 50

A D.C. series motor is that which______________?

28 / 50

Which motor should not be started on no-load ?

29 / 50

In a D.C. machine stray loss is the sum of_____________?

30 / 50

Which of the following loss in a transformer is zero even at full load ____________?

31 / 50

Which of the following is the definition of proportional band of a controller ?

32 / 50

The value of flux involved m the e.m.f. equation of a transformer is____________?

33 / 50

A high Q tuned circuit will permit an amplifier to have high __________________?

34 / 50

Pipes carrying steam are generally made up of_____________?

35 / 50

Equipotential planes are_______________?

36 / 50

The body of Edison cell is made of___________?

37 / 50

In a parallel R-C circuit, the current always________the applied voltage?

38 / 50

Artificial draught is produced by____________?

39 / 50

A material which is slightly repelled by a magnetic field is known as_____________?

40 / 50

The starting winding of a single-phase motor is placed in_________?

41 / 50

In pneumatic control systems the control valve used as final control element converts____________?

42 / 50

The ratio of intensity of magnetisation to the magnetisation force is known as_____________?

43 / 50

Power dissipation in ideal inductor is

44 / 50

The applications of selenium rectifiers are usually limited to potential of_____________?

45 / 50

A double squirrel-cage induction motor has______________?

46 / 50

Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla

47 / 50

The insulating material for cables should____________?

48 / 50

In repulsion motor direction of rotation of motor____________?

49 / 50

If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

50 / 50

Cables for 220 kV lines are invariably____________?

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