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Electrical Engineering Quiz 5

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Electrical Engineering Quiz 5

1 / 50

Total number of crystal systems is____________?

2 / 50

When an ammeter is inserted in the circuit, the circuit current will _____________?

3 / 50

The best indication about the state of charge on a lead-acid battery is given by____________?

4 / 50

What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?

5 / 50

Volt box is a component to_____________?

6 / 50

Short-circuit test on an induction motor cannot be used to determine___________?

7 / 50

Copper brushes in D.C. machine are used_____________?

8 / 50

Materials subjected to rapid reversal of magnetism should have______________?

9 / 50

An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is____________?

10 / 50

If the anode current is 800 A, then the amount of current required to turn off the GTO is about____________?

11 / 50

Which of the following motor has the poorest speed regulation ?

12 / 50

Mercury is a choice with steam in binary vapour cycle because it has____________?

13 / 50

Long distance railways use which of the following ?

14 / 50

When a conductor carries more current on the surface as compared to core, it is due to___________?

15 / 50

The power scale of circle diagram of an induction motor can be found from__________?

16 / 50

In a rotary converter I2R losses as compared to a D.C. generator of the same size will be___________?

17 / 50

The leakage current across a pn junction is due to________________?

18 / 50

What is used to protect a thyristor from high di / dt conditions__________?

19 / 50

In split-phase motor auxiliary winding is of___________?

20 / 50

The maximum efficiency of resistance loaded class A power amplifier is _________________?

21 / 50

In a series resonant band-pass filter, a lower value of Q results in______________?

22 / 50

The attraction capacity of electromagnet will increase if the_______________?

23 / 50

The Q of the crystal is of the order of____________?

24 / 50

In conductors conduction of electricity takes place due to movement of_______________?

25 / 50

During load shedding:

26 / 50

Damping of the Ballistic galvanometer is made small to_______________?

27 / 50

IC = aIE +____________?

28 / 50

In a series parallel circuit, any two resistances in the same current path must be in___________?

29 / 50

In parallel resonance, the circuit impedance is_________________?

30 / 50

1 volt/meter is same as___________?

31 / 50

What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?

32 / 50

Relative permeability of vacuum is__________?

33 / 50

During discharge, the active material of both the positive and negative plates is changed to___________?

34 / 50

For Parson?s reaction steam turbine, degree of reaction is____________?

35 / 50

The effects of EMI can be reduced by_____________?

36 / 50

Six resistors are in parallel. The two lowest-value resistors are both 1.2 k?. The total resistance______________?

37 / 50

In a shaded pole single-phase motor, the revolving field is produced by the use of_________?

38 / 50

Insertion of reactance in the rotor circuit_______?

39 / 50

capacitors are used for audio frequency and radio frequency coupling and tuning ?

40 / 50

If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be____________?

41 / 50

Parson?s turbine is___________?

42 / 50

PVC stands for____________?

43 / 50

The following constitute short-circuit in the armature winding.

44 / 50

If the load resistance decreases in a Zener regulator, then Zener current ______________?

45 / 50

The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as_____________________?

46 / 50

To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?

47 / 50

All of the following are equivalent to watt except_____________?

48 / 50

Which of the following alternatives will be cheaper ?

49 / 50

In resistance heating highest working temperature is obtained from heating elements made of_____________?

50 / 50

A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 K The voltage and current rating of available SCRs are 1800 V and 1000 For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be_____________?

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