Electrical Engineering Quiz 59
1 / 50
Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________?
2 / 50
Which of the following should be used for extinguishing electrical fires?
3 / 50
Which of the following insulation is used in cables ?
4 / 50
Which of the following single-phase motors is suitable for timing and control purposes ?
5 / 50
For constant torque drive which speed control method is preferred ?
6 / 50
In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______?
7 / 50
The power factor of a D.C. circuit is always__________?
8 / 50
In a load curve the highest point represents______________?
9 / 50
In an RC coupling scheme, the coupling capacitor CC must be large enough______________?
10 / 50
Light duty cranes are used in which of the following ?
11 / 50
Double tuned circuits are used in ____________ stages of a radio receiver?
12 / 50
The commonly used material for shielding or screening magnetism is____________?
13 / 50
At _______ frequencies the parallel R-L circuit behaves as purely resistive
14 / 50
In a transistor, the base current is about_________of emitter current?
15 / 50
Compared to transistor, _________ have lower on state conduction losses and higher power handling capability?
16 / 50
If two charges are increased by two times then force_____________?
17 / 50
Leakage current flows through the thyristor in_________?
18 / 50
In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at_____________?
19 / 50
In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be_____________?
20 / 50
A glass rod when rubbed with silk cloth is charged because__________?
21 / 50
In a D.C. generator:___________________?
22 / 50
The chemical used in breather for transformer should have the quality of____________?
23 / 50
Which of the following, in a thermal power plant, is not a fixed cost?
24 / 50
Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately___________?
25 / 50
A 12 k? resistor, a 15 k? resistor, and a 22 k? resistor are in series with two 10 k? resistors that are in parallel. The source voltage is 75 V. Current through the 15 k? resistor is approximately___________?
26 / 50
An ammeter should have_____________ resistance?
27 / 50
Which of the following circuit elements will oppose the change in circuit current ?
28 / 50
The design of mechanical parts is particularly important in case of __________ speed machines?
29 / 50
A cable carrying alternating current has__________?
30 / 50
The capacity of a crane is expressed in terms of_______________?
31 / 50
Materials exhibiting zero value of resistivity are known as ____________ ?
32 / 50
A thyristor is basically________?
33 / 50
Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
34 / 50
A 10 V power supply would use ____________ as filter capacitor?
35 / 50
The loads on distributors systems are generally__________________?
36 / 50
The purpose of using short-circuit gear is___________?
37 / 50
Which of the following is the non-linearity caused by servomotor ?
38 / 50
The purpose of providing iron core in a step-up transformer is?
39 / 50
If the input capacitor of a transistor amplifier is short-circuited, then_________________?
40 / 50
A conductor carries 125 amperes of current under 60? to a magnetic field of 1.1 tesla. The force on the conductor will be nearly______________?
41 / 50
The transient currents are associated with the____________?
42 / 50
In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?
43 / 50
Which of the following is a bilateral element?
44 / 50
In the case of an unsymmetrical alternating current the average value must always be taken over__________?
45 / 50
The arc voltage produced in A.C. circuit breaker is always_____________?
46 / 50
___________________has least range of speed control?
47 / 50
In a three-phase induction motor__________?
48 / 50
A VTVM has_____________input resistance than that of a multi meter?
49 / 50
A transistor behaves as a linear device for _____________?
50 / 50
Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________?
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