Electrical Engineering Quiz 28
1 / 50
What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
2 / 50
To detect an over ? current fault condition, the most reliable method is to connect a_____________?
3 / 50
An ammeter is a______________?
4 / 50
Overheating of relay contacts or contact born out is due to_______________?
5 / 50
Which of the following mercury arc rectifier will deliver least undulating current?
6 / 50
Copper as conductor for cables is used as________?
7 / 50
The best place to install a capacitor is___________?
8 / 50
Out of the following which is not a poor conductor__________?
9 / 50
________________directly converts temperature into voltage?
10 / 50
By the use of which of the following power factor can be improved?
11 / 50
Hydrogen evolved during charging produces explosive mixture when it is more than___________?
12 / 50
Zener diode are generally made of _____________?
13 / 50
If ground is applied to the (+) terminal of an inverting op-amp, the (?) terminal will_____________?
14 / 50
In force-voltage analogy, velocity is analogous to______________?
15 / 50
The transient response of a system is mainly due to________________?
16 / 50
Which of the following devices is necessarily required for automatic temperature control in a furnace ?
17 / 50
Losses which occur in rotating electric machines and do not occur in transformers are___________?
18 / 50
The voltage used for suburban trains in D.C. system is usually_______________?
19 / 50
Which of the following motors always starts on load ?
20 / 50
The output impedance of a transistor is____________?
21 / 50
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?
22 / 50
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?
23 / 50
Which of the following does not change in an ordinary transformer ?
24 / 50
Capacitor does not allow the sudden change of ?
25 / 50
The application where one would most likely find a crystal oscillator is____________?
26 / 50
At parallel resonance, the phase angle between the applied voltage and circuit current is _____________?
27 / 50
If the temperature of a crystal diode increases, then leakage current ______________?
28 / 50
The disadvantage of voltage divider bias is that it has _________________?
29 / 50
With a D.C. generator which of the following regulation is preferred ?
30 / 50
In square wave operation mode of 3 phase VSI, the VSI
31 / 50
An induction motor with 1000 r.p.m. speed will have____________?
32 / 50
Which of the following materials does not have covalent bonds ?
33 / 50
An RC low-pass filter consists of a 120 ? resistor and a 0.002 ?F capacitor. The output is taken across the capacitor. The circuit?s critical frequency is___________?
34 / 50
What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it__________ ?
35 / 50
A rotary converter in general construction and design, is more or less like___________?
36 / 50
Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
37 / 50
Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?
38 / 50
The output stage of a multistage amplifier is also called _________________-?
39 / 50
D.C. shunt relays are made of_____________?
40 / 50
In a three-phase induction motor_______________?
41 / 50
A single phase ac ? dc converter is also known as____________?
42 / 50
If the resistance of a tuned circuit is increased, the Q of the circuit _______________?
43 / 50
The number of electrons in the outer most orbit of carbon atom is___________?
44 / 50
cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?
45 / 50
If Amin = 40 and Amax = 60, what is the percentage of modulation?
46 / 50
capacitors are mainly used for radio frequency tuning?
47 / 50
For similar carrier and modulating signals, the line current used in CSI is__________?
48 / 50
Ageing of a selenium rectifier may change the output voltage by__________?
49 / 50
A shell-type transformer has_________?
50 / 50
Which D.C. motor will be preferred for machine tools ?
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