Electrical Engineering Quiz 70
1 / 50
The speed of a locomotive is controlled by_______________?
2 / 50
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit____________________?
3 / 50
The multiplier and the meter coil in a voltmeter are in________________?
4 / 50
For increasing the voltage rating, zeners are connected in_____________?
5 / 50
The upper or lower cut off frequency is also called______________frequency?
6 / 50
Alternating current is measured by_______________?
7 / 50
At low value of power factor, the cost of generation of a power station will be____________?
8 / 50
The efficiencies of transformers compared with that of electric motors of the same power are____________?
9 / 50
If three 10 uF capacitors are connected in parallel, the net cararitance is___________?
10 / 50
Dielectric strength _________ with increasing thickness
11 / 50
A zener diode has ______________ breakdown voltage?
12 / 50
For proper amplification by a transistor circuit, the operating point should be located at the_____________ of the d.c. load line?
13 / 50
The lines of force due to charged particles are_________?
14 / 50
The adjustment of position of shading bands, in an energy meter is done to provide______________?
15 / 50
In ________________ method of staging three phase induction motors the starting voltage is not reduced?
16 / 50
The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?
17 / 50
In a series circuit with unequal resistances______________?
18 / 50
A D.C. generator can be considered as____________?
19 / 50
AC power in a load can be controlled by using____________?
20 / 50
Helical windings are used in________________?
21 / 50
In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be______________?
22 / 50
The e.m.f. generated by a shunt wound D.C. generator is
23 / 50
A certain inverting amplifier has a closed-loop voltage gain of 25. The Op-amp has an open-loop voltage gain of 100,000. If an Op-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain________________?
24 / 50
The output power of a transistor amplifier is more than the input power because the additional power is supplied by__________________?
25 / 50
When a transmission line is energized, the wave that propagates on it is____________?
26 / 50
Susceptibility is positive for______________?
27 / 50
The inductance of a coil can be increased by_________?
28 / 50
High load factor indicates
29 / 50
Which of the following are non-conductors of electricity?
30 / 50
In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________?
31 / 50
When two D.C. generators are running in parallel an equilizer bar is used______________?
32 / 50
If the gate voltage of an SCR is removed, then the_______________?
33 / 50
In differential-mode, ______________?
34 / 50
ON state voltage drop across SCR lie between the range_____________?
35 / 50
Most of the high transmission lines in Pakistan are_______________?
36 / 50
Hartley oscillator is commonly used in______________?
37 / 50
Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?
38 / 50
An ideal transformer will have maximum efficiency at a load such that?
39 / 50
Aphasoris________?
40 / 50
A differentiating circuit is a simple RC circuit with output taken across ____________?
41 / 50
Following motor is used where high starting torque and wide speed range control is required?
42 / 50
Most of the common metals have _________ structure?
43 / 50
The under voltage relay can be used for______________?
44 / 50
The maximum firing angle in the half wave controlled regulator is_____________?
45 / 50
Air will not be the working substance in which of the following?
46 / 50
When negative voltage feedback is applied to an amplifier, its voltage gain ____________?
47 / 50
In case of 3-phase induction motors, plugging means__________?
48 / 50
The size of a transformer core will depend on__________?
49 / 50
Direct water cooling of rotor winding presents_____________?
50 / 50
Which of the following motors has highest starting torque ?
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