Electrical Engineering Quiz 58
1 / 50
Due to which of the following fact, in India, aluminium is replacing copper ?
2 / 50
Series motor is not suited for traction duty due to which of the following account ?
3 / 50
Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity
4 / 50
The PIV rating of a crystal diode is _______________ that of equivalent vacuum diode
5 / 50
The power mentioned on the name plate of an electric motor indicates____________?
6 / 50
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials
7 / 50
The input impedance of a JFET is _____________that of an ordinary transistor?
8 / 50
A condenser suitable for D.C. only is________?
9 / 50
Electrical machines having a power output up to about 750 W may be called__________machines?
10 / 50
In series motor which of the following methods can be used for changing the flux per pole ?
11 / 50
ICs are used in ______________?
12 / 50
Overload capacity of diesel engines is usually restricted to_______________?
13 / 50
The superhetrodyne principle provides selectivity at ______________stage?
14 / 50
The voltage gain of an emitter follower is _____________?
15 / 50
In an electric press mica is used_____________?
16 / 50
When load on an over-excited or under excited synchronous*motor is increased, rate of change of its armature current as compared with that of power factor is___________?
17 / 50
A control system in which the control action is somehow dependent on the output is known as____________?
18 / 50
A hole and electron in close proximity would tend to________________?
19 / 50
For an SCR gate – cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance_____?
20 / 50
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be_____________?
21 / 50
In cables the charging current__________?
22 / 50
For the same peak value which of the following wave will ?have the highest r.m.s. value?
23 / 50
In steam turbines the reheat factor_____________?
24 / 50
At 100% modulation, the power in each sideband is _____________ of that of carrier?
25 / 50
Spring constant in force-voltage analogy is analogous to_____________?
26 / 50
Which of the following motors is used for elevators ?
27 / 50
An automatic toaster is a ___________ loop control system?
28 / 50
When a pentavalent impurity is added to a pure semiconductor, it becomes________________?
29 / 50
A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density when the radius of the coil increases from r1 to r2 in time ?t then what is the emf induced in the coil ?
30 / 50
Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________?
31 / 50
In D.C. generators on no-load, the air gap flux distribution in space is______________?
32 / 50
A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?
33 / 50
A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is______________?
34 / 50
Which of the following happens when star-delta starter is used ?
35 / 50
In TV transmission, sound signal is ______________modulated?
36 / 50
The unit of reluctance is_____________?
37 / 50
The source terminal of a JEFT corresponds to _____________ of a vacuum tube?
38 / 50
Constant voltage transmission entails the following disadvantage?
39 / 50
Arc in a circuit behaves as_______________?
40 / 50
A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8 The potential on its surface will be_________________?
41 / 50
IC = [a / (1 ? a )] IB +_____________?
42 / 50
Inductance of coil___________?
43 / 50
When a transistor is connected in common emitter mode, it with have__________?
44 / 50
The field coils of D.C. generator are usually made of_____________?
45 / 50
Negative feedback is employed in __________________?
46 / 50
A crystal diode has______________?
47 / 50
Form factor for a sine wave is________?
48 / 50
A voltage follower _____________?
49 / 50
If an electrons is allowed to move along the field in a non uniform electric field then it will follow__________________?
50 / 50
The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to ?
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