Electrical Engineering Quiz 4
1 / 50
For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
2 / 50
Which of the following devices are commonly used as error detectors in instruments ?
3 / 50
The density of hydrogen is __________ times the density of air?
4 / 50
A 1,000 V power supply would use_____________ as a filter capacitor?
5 / 50
In an Anderson bridge, the unknown inductance is measured in terms of_______________?
6 / 50
Resistance grounding is used for voltage between_________________?
7 / 50
Machines cooled by direct cooling method may be called_____________?
8 / 50
The most commonly used transistor arrangement is____________arrangement?
9 / 50
The direction of rotation of a D.C. series motor can be changed by___________?
10 / 50
The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are____________?
11 / 50
In which of the following applications the load on motor changes in cyclic order ?
12 / 50
The efficiency of the copper oxide rectifier seldom exceeds____________?
13 / 50
Empire tape is__________?
14 / 50
The total resistance of a parallel circuit is 50 ?. If the total current is 120 mA, the current through the 270 ? that makes up part of the parallel circuit is approximately_______________?
15 / 50
A JFET has three terminals, namely________________?
16 / 50
_________________cannot be fabricated on an IC?
17 / 50
In heating the ferromagnetic material by induction heating, heat is produced due to_____________?
18 / 50
In a mercury arc rectifier positive ions are attracted towards______________?
19 / 50
For measurement of mutual inductance we can use________________?
20 / 50
Which of the following is measured by using a vector voltmeter ?
21 / 50
Salvage value of the plant is always____________?
22 / 50
A thyristor can termed as__________?
23 / 50
Zener diode can be used as__________________?
24 / 50
In a domestic cake baking oven the temperature is controlled by________________?
25 / 50
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of_____________?
26 / 50
With zero volts on both inputs, an OP-amp ideally should have an output _______________?
27 / 50
Transformer breaths in when_______________?
28 / 50
The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________?
29 / 50
If an inductance is connected in one arm of bridge and resistances in the remaining three arms____________?
30 / 50
The speed of a synchronous motor:
31 / 50
Hysteresis is desirable in Schmitt-trigger, because______________?
32 / 50
Which of the following materials is not used for transmission and distribution of electrical power________________?
33 / 50
A synchronous motor can operate at____________?
34 / 50
A linear resistor having 0 < R < ?o is a______________?
35 / 50
At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is_____________?
36 / 50
Pressure error can be measured by which of the following ?
37 / 50
Fleming?s left hand rule is used to find_________________?
38 / 50
Magnetic circuit breaker has ___________ trip action
39 / 50
Electrolyte used in a lead-acid cell is__________?
40 / 50
In the transformer following winding has got more cross-sectional area______________?
41 / 50
Kirchhoffs current law is applicable to only
42 / 50
Short circuit test on transformers is conducted to determine____________?
43 / 50
A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?
44 / 50
The operation of a D.C. machine with large air gap lengths is comparatively_____________?
45 / 50
An important limitation of a crystal oscillator is____________?
46 / 50
In ac ? dc conversion, when the switch is closed then the sum of voltages around the loop is____________?
47 / 50
A load curve indicates___________?
48 / 50
A reverse bias pn junction has_____________?
49 / 50
The value of exciting or magnetizing current depends upon which of the following factors ?
50 / 50
Transmission voltage of 11 kV is normally used for distances up to_____km?
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