Electrical Engineering Quiz 57
1 / 50
Efficiency of a power transformer is of the order of________________?
2 / 50
The purpose of d.c. conditions in a transistor is to___________________?
3 / 50
Each cell has a vent cap________?
4 / 50
The no load current in a transformer lags behind the applied voltage by an angle of about_____________?
5 / 50
Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is________________?
6 / 50
If an instrument has cramped scale for larger values, then it follows________________?
7 / 50
The operating voltage of extra high tension cables is upto_______________?
8 / 50
The circle diagram for an induction motor cannot be used to determine____________?
9 / 50
Which of the following motors one will choose to drive the rotary compressor ?
10 / 50
The best frequency response is of_____________coupling?
11 / 50
Time constant of an inductive circuit___________?
12 / 50
4 thyristors rated 200 V in series. The operating voltage of the string is 600 V. Derating factor of the string is_____________________?
13 / 50
Which of the following generating machine will offer constant voltage on all loads?
14 / 50
A steam power stations basically work on the______________?
15 / 50
Number of tappings for each equalizer ring is equal to_____________?
16 / 50
In over compounded generator, full load terminal voltage is______________?
17 / 50
In two part tariff, variation in load factor will affect____________?
18 / 50
Interpole flux should be sufficient to_____________?
19 / 50
A common method of cooling a power transformer is_______________?
20 / 50
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
21 / 50
An ideal switch is___________?
22 / 50
D.C. windings are____________?
23 / 50
A NAND gate is called a universal logic element because______________?
24 / 50
The main factor which leads to unstable parallel operation of flat and over compounded generators is_____________?
25 / 50
The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?
26 / 50
Torque developed by a single phase induction motor at starting is_____________?
27 / 50
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is___________?
28 / 50
The capacity of large turbo-generators varies from___________?
29 / 50
Which of the following test can be performed on DC series motor?
30 / 50
On which of the following factors the number of phases for which a rectifier should be designed depend ?
31 / 50
The effect of increasing the load on a synchronous motor running with normal excitation is to___________?
32 / 50
A JFET is a__________ driven device?
33 / 50
Charging of sulfated battery produces _________ heat
34 / 50
For the same H.P. rating and full load speed, following motor has poor starting torque_____________?
35 / 50
The pinch-off voltage in a JFET is analogous to _____________ voltage in a vacuum tube?
36 / 50
The pointer of an indicating instrument should be______________?
37 / 50
A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________?
38 / 50
The time constant of a series R-C circuit is given by____________?
39 / 50
A thermal protection switch can protect against_____________?
40 / 50
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________?
41 / 50
A transmission line is protected by_____________?
42 / 50
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by_____________?
43 / 50
Commercial power supplies have voltage regulation ______________?
44 / 50
Permeance is the reciprocal of______________?
45 / 50
For V-curves for a synchronous motor the graph is drawn between:_______________?
46 / 50
In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________?
47 / 50
Operating torques in analogue instruments are_______________?
48 / 50
By which of the following a bus-bar is rated?
49 / 50
The efficiency of an induction motor can be expected to be nearly____________?
50 / 50
Which of the following materials has a negative temperature co-efficient of resistance?
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