Electrical Engineering Quiz 8
1 / 50
The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to _________ percent of its value
2 / 50
If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will__________?
3 / 50
For intermittent work which of the following furnaces is suitable ?
4 / 50
When the load resistance equals the generator resistance which of the following will be maximum __________?
5 / 50
In a rotary converter armature currents are______________?
6 / 50
If three 15 uF capacitors are connected in series, the net capacitance is
7 / 50
Sparking at the commutator of a D.C. motor may result in____________?
8 / 50
Life of the Edison cell is at least_____________?
9 / 50
In an AC. circuit, a low value of kVAR compared with kW indicates_________?
10 / 50
Capacitance increases with_____________?
11 / 50
The efficiency of chimney is approximately______________?
12 / 50
Which of the following statements regarding reluctance-start motor is incorrect ?
13 / 50
A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
14 / 50
In order to remove static electricity from machinery___________?
15 / 50
Which of the following are integrating instruments ?
16 / 50
If load resistance in the above question (Q.49) is removed, the output voltage will_____________?
17 / 50
An ideal regulated power supply is one which has voltage regulation of________________?
18 / 50
The voltage drop for which of the following types of brush can be expected to be least ?
19 / 50
The unit of retentivity is____________?
20 / 50
If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to___________________?
21 / 50
A squirrel cage induction motor is not selected when___________?
22 / 50
The above statement is associated with
23 / 50
The degree of mechanical vibrations produced by the laminations of a transformer depends on____________?
24 / 50
Which of the following is an advantage of static capacitor for power factor improvement?
25 / 50
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in____________?
26 / 50
n a phase controlled 3 phase ac voltage controller, the harmonic present is__________?
27 / 50
A gas turbine basically work on
28 / 50
As a result of introduction of negative feedback which of the following will not decrease ?
29 / 50
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on ______________?
30 / 50
Transistor biasing represents ______________ conditions?
31 / 50
Most of the majority carriers from the emitter____________?
32 / 50
In a shaded pole motor, the shading coil usually consist of___________?
33 / 50
When a step-input is given to an op-amp integrator, the output will be______________?
34 / 50
The angle between the rotating stator flux and rotor poles is called _________ angle.
35 / 50
Current produced by moving the loop of wire across a magnetic field is called_____________?
36 / 50
A certain common-source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ______________?
37 / 50
RC coupling is not used to amplify extremely low frequencies because____________?
38 / 50
310 km line is considered as_______________?
39 / 50
The laminations of the armature of a D.C. machine are usually ___________ thick?
40 / 50
In Colpitt?s oscillator, feedback is obtained___________?
41 / 50
In a Weston synchronoscope, the fixed coils are connected across_______________?
42 / 50
The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as__________?
43 / 50
Yokes with rectangular cross-section are used for_______________?
44 / 50
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
45 / 50
Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?
46 / 50
When a wave propagates on a transmission line, it suffers reflection several times at_____________?
47 / 50
The phase angle of gate signal in TRIAC can be shifted by using_____________?
48 / 50
In open loop system_____________?
49 / 50
If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________?
50 / 50
The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?
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