Electrical Engineering Quiz 71
1 / 50
Which of the following statements regarding single-phase induction motors correct?
2 / 50
The armature current of the synchronous motor has higher values for_____________?
3 / 50
A differential amplifier has a differential gain of 20,000. CMMR=80d The common mode gain is given by_______________?
4 / 50
Switching frequency of SITH is____________?
5 / 50
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be_____?
6 / 50
Over charging______________?
7 / 50
An SCR is made up of silicon because_____________?
8 / 50
If I2 be the armature current, then speed of a D.C. shunt motor is_______________?
9 / 50
In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
10 / 50
To meet high current demand we use SCRs in______________?
11 / 50
The rate of rise of current through an inductive coil is maximum_____________?
12 / 50
Which of the following has lower specific gravity V__________?
13 / 50
Iron losses in a D.C. machine are independent of variations in______________?
14 / 50
A.C cannot be used for_______________?
15 / 50
Substances whose specific resistance abruptly decreases at very low temperature are called___________?
16 / 50
A keeper is used to_____________?
17 / 50
Which of the following loss in a D.C. generator is dissipated in the form of heat?
18 / 50
When an additional resistor is connected across an existing parallel circuit, the total resistance____________?
19 / 50
The viscous friction co-efficient, in force-voltage analogy, is analogous to______________?
20 / 50
In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3
21 / 50
In a regenerative surface condenser_____________?
22 / 50
The capacity of a lead-acid cell depends on
23 / 50
In direct cooled system using hydrogen both stator and rotor conductors are made____________?
24 / 50
A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor_______________?
25 / 50
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?
26 / 50
The voltage gain of a tuned amplifier is____________at resonant frequency
27 / 50
A parallel AC circuit in resonance will__________?
28 / 50
The single phasing relays are used for the protection of_____________?
29 / 50
The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of___________?
30 / 50
The time of closing the cycle, in modern circuit breakers is_____________?
31 / 50
If a transformer is switched on to a voltage more than the rated voltage______________?
32 / 50
Electric intensity being a vector quantity always points_______________?
33 / 50
An advantage of RC coupling scheme is the___________?
34 / 50
A potentiometer may be used for_________________?
35 / 50
A n-channel D-MOSFET with a positive VGS is operating in _______________?
36 / 50
Overhead telephone wires are made of_____________?
37 / 50
If any two phases for an induction motor are interchanged_______?
38 / 50
Directional relays are based on flow of____________?
39 / 50
Which one of the following does not have negative temperature co-efficient ____________?
40 / 50
The unit of magnetic flux is______________?
41 / 50
A region around a stationary electric charge has__________?
42 / 50
During rheostat braking of D.C. series motors_____________?
43 / 50
Conduit pipes are normally used to protect _______ cables
44 / 50
With which of the following, a circuit breaker must be equipped for remote operation ?
45 / 50
For which of the applications a reluctance motor is preferred ?
46 / 50
A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
47 / 50
A crystal diode is used as______________?
48 / 50
The magnetism left in the iron after exciting field has been removed is known as____________?
49 / 50
Which of the following motors is used in mixies ?
50 / 50
Which of the following statements is correct ?
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