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Electrical Engineering Quiz 67

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Electrical Engineering Quiz 67

1 / 50

If the gate of a JFET is made less negative, the width of the conducting channel__________________?

2 / 50

On overcharging a battery____________?

3 / 50

In amplitude modulation, the _____________of carrier is varied according to the strength of the signal?

4 / 50

A Zener diode that has very narrow depletion layer will breakdown by____________ mechanism?

5 / 50

______________By which of the following the system response can be tested better ?

6 / 50

If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens?

7 / 50

Which of the following types of motor enclosure is safest ?

8 / 50

A pump induction motor is switched on to a supply 30% lower than its rated voltage. The pump runs. What will eventually happen ? It will____________?

9 / 50

Satellite power requirement is provided through________?

10 / 50

A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is _____________?

11 / 50

An induction wattmeter can be used for_________________?

12 / 50

A synchronous motor can be used as a synchronous capacitor when it is____________?

13 / 50

If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?

14 / 50

Substances which have permeability less than the permeability of free space are known as_____________?

15 / 50

Artificial draught is produced by______________?

16 / 50

What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

17 / 50

The minimum charge on an ion is______________?

18 / 50

The most commonly used semiconductor in the manufacture of a transistor is_____________?

19 / 50

The input impedance of a transistor connected in___________arrangement is the highest?

20 / 50

While preparing electrolyte for a lead-acid battery___________?

21 / 50

The use of permanent magnets is. not made in_____________?

22 / 50

Ajax Wyatt furnace is started when____________?

23 / 50

With reference to a power station which of the following is not a fixed cost?

24 / 50

Which medium has the least dielectric strength ____________?

25 / 50

Silicon steel is used in electrical machines because it has_____________?

26 / 50

The disadvantage of impedance matching is that it _______________?

27 / 50

The mcrease in heat dissipation by air blasts is due to increase in______________?

28 / 50

Which of the following meters are not used on D.C. circuits______________?

29 / 50

Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?

30 / 50

In case of _________ fuel transportation is the major problem.

31 / 50

What may happen high dV / dt____________?

32 / 50

In a cable the voltage stress is maximum at____________?

33 / 50

In a D.C. generator the critical resistance can be increased by_____________?

34 / 50

In a series resonant circuit, the impedance of the circuit is___________?

35 / 50

Slip ring motor is recommended where____________?

36 / 50

Five 100 ? resistors are connected in parallel. If one resistor is removed, the total resistance is______________?

37 / 50

Which of the following is not a unit of flux?

38 / 50

A 3-phase slip ring motor has____________?

39 / 50

The current gain of a bipolar transistor drops at high frequencies because of____________?

40 / 50

The ratio of active power to apparent power is known as factor__________?

41 / 50

The stating torque of the slip ring induction motor can be increased by adding__________?

42 / 50

If a multimeter has a sensitivity of 1000 O per volt and reads 50 V full scale, its internal resistance is _____________?

43 / 50

During short circuit test iron losses are negligible because of _____________?

44 / 50

E.m.f. of a Weston cell is accurately measured by________________?

45 / 50

The transformer oil should have _______ volatility and _______ viscosity?

46 / 50

A phase shifting transformer is used in conjunction with_______________?

47 / 50

The switching function of semiconductor devices can be characterized with___________?

48 / 50

Which of the following relays is used on long transmission lines?

49 / 50

In split phase motor main winding is of _____________?

50 / 50

When a given transformer is run at its rated voltage but reduced frequency, its____________?

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