Electrical Engineering Quiz 15
1 / 50
Commonly used conducting materials are_____________?
2 / 50
A radio receiver has____________of amplification?
3 / 50
The common-mode voltage gain of a differential amplifier is equal to RC divided by _______________?
4 / 50
________________ coupling is generally employed in power amplifiers?
5 / 50
Which of the following amplifier circuit using junction transistor has the best gain?
6 / 50
Exciters of synchronous machines are______________?
7 / 50
An open resistor, when checked with an ohm-meter reads_____________?
8 / 50
If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking?
9 / 50
Capacitors for power factor correction are rated in_________?
10 / 50
A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?
11 / 50
Which of the following bus-bar schemes has the lowest cost?
12 / 50
The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
13 / 50
relays are used for phase faults on long line?
14 / 50
_________ locomotive has the highest operational availability?
15 / 50
A zener diode is used as ______________?
16 / 50
As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?
17 / 50
Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of_______________?
18 / 50
In a transformer the energy is conveyed from primary to secondary_________?
19 / 50
After proper turn on of thyristor____________?
20 / 50
Four resistors of equal value are connected in parallel. If the total voltage is 15 V and the total resistance is 600 ?, the current through each parallel resistor is____________?
21 / 50
Various adjustments in an energy meter include_______________?
22 / 50
In Hopkinson demand rate or two part tariff the demand rate or fixed charges are__________?
23 / 50
The input stage of an Op-amp is usually a ________________?
24 / 50
Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
25 / 50
A galvanometer in series with a high resistance is called_______________?
26 / 50
If the diversity factor of a power station is high then its generation cost is___________?
27 / 50
The frequency of domestic power supply in Pakistan is_________?
28 / 50
In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?
29 / 50
Which of the following source of power is least reliable?
30 / 50
Which of the following methods is used to start a synchronous motor?
31 / 50
The capacitors used in single-phase capacitor motors have no__________?
32 / 50
Direct arc furnaces have which of the following power factors ?
33 / 50
The type 2 system has __________ at the origin?
34 / 50
Synchronous motor always runs at______________?
35 / 50
In a sine wave the slope is constant_______?
36 / 50
A terminal where three on more branches meet is known as______________?
37 / 50
Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________?
38 / 50
Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?
39 / 50
An electric filament bulb can be worked from____________?
40 / 50
For a differentiating circuit to be effective, the RC product should be ___________ the time period of the input wave?
41 / 50
In an energy meter braking torque is produced to________________?
42 / 50
An RC snubber network used in BJT__________?
43 / 50
When two D.C. series generators are running in parallel, an equilizer bar is used________________?
44 / 50
Delay time is defined by the interval when_______________?
45 / 50
During charging the specific gravity of the electrolyte of a lead-acid battery
46 / 50
The critical resistance of the D.C. generator is the resistance of_____________?
47 / 50
The current gain of a BJT is__________?
48 / 50
A series resistance is connected in the zener circuit to_______________?
49 / 50
Radiant heating is used for which of the following ?
50 / 50
Laminated cores, in electrical machines, are used to reduce____________?
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