Electrical Engineering Quiz 19
1 / 50
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as__________?
2 / 50
The main reason for generation of harmonics in a transformer could be_______________?
3 / 50
The voltage drop at anode, in a mercury arc rectifier is due to_____________?
4 / 50
An oscillator differs from an amplifier because it_____________?
5 / 50
In the SPWM, the modulating signal is___________?
6 / 50
A silicon transistor is biased with base resistor method. If ?=100, VBE =0.7 V, zero signal collector current IC = 1 mA and VCC = 6V , what is the value of the base resistor RB ?
7 / 50
To produce cathode spot in a mercury arc rectifier______________?
8 / 50
In an LC oscillator, the frequency of oscillator is____________L or C?
9 / 50
The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?
10 / 50
The early effect in a bipolar junction transistor is caused by_______________?
11 / 50
The hfe parameter is called ______________in CE arrangement with output shorted?
12 / 50
Which is the most superior dielectric out of the following ?
13 / 50
A commutating rectifier consists of commutator driven by___________?
14 / 50
COOLMOS device can be used in application up to power range of___________?
15 / 50
Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?
16 / 50
An ideal OP-AMP is an ideal______________?
17 / 50
An H.R. fuse is_______________?
18 / 50
An ideal OP-AMP is an ideal___________?
19 / 50
Class_____________ power amplifier has the highest collector efficiency ?
20 / 50
Which of the following happens in Kando system ?
21 / 50
When both the inductance and resistance of a coil are doubled the value of________________?
22 / 50
Temperature of the stator winding of a three phase induction motor is obtained by___________?
23 / 50
In the transformer the function of a conservator is to_______________?
24 / 50
have maximum unbalanced forces_______________?
25 / 50
Single phase VSI are mainly used in___________?
26 / 50
The thermal conductivity of hydrogen is _____________ times that of air?
27 / 50
Multicore cables generally use________________?
28 / 50
The type 1 system has _________ at the origin?
29 / 50
In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is________________?
30 / 50
Which of the following is the demerit of a ?constant voltage transmission system? ?
31 / 50
Modulation refers to a low-frequency signal controlling the ________________?
32 / 50
Which of the following is the unit of magnetic flux density ?
33 / 50
Which of the following plants is almost inevitably used as base load plant?
34 / 50
The ampere-hour efficiency of a lead acid cell is normally between_________?
35 / 50
If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as___________?
36 / 50
power plant is expected to have the longest life?
37 / 50
Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
38 / 50
For driving high inertia loads best type of induction motor suggested is_____________?
39 / 50
The voltage drop, for constant voltage transmission is compensated by installing__________?
40 / 50
Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?
41 / 50
The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?
42 / 50
The same signal in Problem 2 is applied to an RC high-pass filter. If the reactance is zero at the input frequency, the output voltage is____________?
43 / 50
The voltage regulation in magnetic amplifier type voltage regulator is effected by__________?
44 / 50
A 5 ?F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?
45 / 50
The corona is considerably affected by which of the following _______________?
46 / 50
_____________ filter circuit results in the best voltage regulation?
47 / 50
Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?
48 / 50
Reduction in core losses and increase in permeability are obtained with transformer employing__________?
49 / 50
As the modulation level is increased, the carrier power__________________?
50 / 50
In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies
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