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