Electrical Engineering Quiz 47
1 / 50
The active components in an IC are _______________?
2 / 50
Emitter follower is used for ________________?
3 / 50
Which of following is not a power transistor?
4 / 50
In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?
5 / 50
The ground wire should not be smaller than No _________ copper
6 / 50
For three-phase induction motors which of the following is the least efficient method of speed control ?
7 / 50
Transformer coupling provides high efficiency because___________?
8 / 50
In lap winding, the number of brushes is always_____________?
9 / 50
In a capacitive circuit___________?
10 / 50
One kilowatt hour is equal to_________?
11 / 50
When current feedback (negative) is applied to an amplifier, its output impedance ________________?
12 / 50
The draught produced by chimney of given height at given outside temperature___________?
13 / 50
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of_________________?
14 / 50
The frequency of voltage generated, in case of generators, can be increased by___________?
15 / 50
These days D.C. motors are widely used in____________?
16 / 50
Diversity factor has direct effect on the____________?
17 / 50
The reflection co-efficient at the open circuited end of a transmission line___________?
18 / 50
If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because__________________?
19 / 50
What is used to protect the SCR from over current ________________?
20 / 50
The knee voltage of a crystal diode is approximately equal to ________________?
21 / 50
Iron loss of a transformer can be measured by____________?
22 / 50
Skin effect occurs when a conductor carries current at_______ frequencies
23 / 50
The efficiency of a properly designed synchronous motor will usually fall in range___________?
24 / 50
When the graph between current through and voltage across a device is a straight line, the device is referred to as _______________?
25 / 50
Tuned class C amplifiers are used for RF signals of________________?
26 / 50
Which of the following circuit breakers has high reliability and minimum maintenance ?
27 / 50
Superconducting metal in super conducting state has relative permeability of________________?
28 / 50
48 ampere-hour capacity would deliver a current of___________?
29 / 50
Which of the following motors are best for the rolling mills ?
30 / 50
The electrical power to a meggar is provided by________________?
31 / 50
Which of the following parts of a transformer is visible from outside ?
32 / 50
In case the air gap in an induction motor is increased?
33 / 50
In a DC motor the inter-pole winding is connected in________________?
34 / 50
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
35 / 50
A rotary converter operates at a______________?
36 / 50
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?
37 / 50
The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?
38 / 50
In a D.C. machine, the value of peripheral speed should not, normally, exceed___________?
39 / 50
The advantage of using free ? wheeling diode in half controlled bridge converter is that
40 / 50
D.C. generators are normally designed for maximum efficiency around_____________?
41 / 50
Which of the following characteristics should the line supports for transmission lines possess?
42 / 50
Synchronous motors are_____________?
43 / 50
The turn-on time of an SCR with inductive load is 20 ?s. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will___________?
44 / 50
In case of the induction motors the torque is___________?
45 / 50
An AF amplifier is shielded to ________________?
46 / 50
The phase difference between the input and output voltages of a transistor connected in common emitter arrangement is___________?
47 / 50
A series generator can self-excite:______________?
48 / 50
Aluminium has a specific gravity of___________?
49 / 50
Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
50 / 50
In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?
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