Electrical Engineering Quiz 72
1 / 50
The photo-electric effect occurs only when the incident light has more than a certain critical____________?
2 / 50
A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will___________?
3 / 50
If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is_____________?
4 / 50
Which of the fpllowing inductor will have the least eddy current losses ?
5 / 50
High voltage transmission lines use__________________?
6 / 50
The power gain in a transistor connected in___________arrangement is the highest?
7 / 50
Reciprocal of permeability is____________?
8 / 50
Example of a voltage clamping device______________?
9 / 50
The synchronous motor is not inherently self-starting because_______________?
10 / 50
The signal voltage induced in the aerial of a radio receiver is of the order of_____________?
11 / 50
Thermal runaway occurs when_________________?
12 / 50
The following indicate that battery on charge has attained full charge___________?
13 / 50
In repulsion motor, zero torque is developed when___________?
14 / 50
The information to the circuit breaker under fault conditions is provided by____________?
15 / 50
The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as____________?
16 / 50
Local action in a battery is indicated by____________?
17 / 50
The torque angle, in a synchronous motor, is the angle between_______________?
18 / 50
Dielectric constant for mica is nearly_____________?
19 / 50
Most of the linear ICs are based on the two-transistor differential amplifier because of its___________?
20 / 50
A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have_____________?
21 / 50
The watt-hour efficiency of a lead-acid cell varies between________?
22 / 50
Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity ?
23 / 50
It is noticed that durum charging___________?
24 / 50
Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
25 / 50
There is a need of transformer for__________________?
26 / 50
For which motor the speed can be controlled from rotor side ?
27 / 50
For a particular application the type of electric-and control gear are determined by which of the following considerations ?
28 / 50
In a hysteresis motor, the rotor must have____________?
29 / 50
The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?
30 / 50
Specific gravity of electrolyte in Edison cell is_____________?
31 / 50
The circuit whose properties are same in either direction is known as__________?
32 / 50
In tramways which of the following motors is used ?
33 / 50
As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?
34 / 50
Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of _____________?
35 / 50
The leakage current in a pn junction is of the order of________________?
36 / 50
The direction of magnetic lines of force is________________?
37 / 50
As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately______________?
38 / 50
Slip rings are usually made of___________?
39 / 50
Resistance variation method of temperature control is done by connecting resistance elements in_____________?
40 / 50
?In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources?. The above statement is associated with:
41 / 50
Which of the following motor will give the highest starting torque ?
42 / 50
If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is____________?
43 / 50
An ideal diode is___________?
44 / 50
The position and velocity errors of a type-2 system are_____________?
45 / 50
In a radio receiver, noise is generally developed at _______________?
46 / 50
The shaded pole motor is used for__________?
47 / 50
_____________can generate power at unpredictable or uncontrolled times?
48 / 50
A synchronous machine with low value of short-circuit ratio has___________?
49 / 50
The output stage of a multistage amplifier usually employs _________________?
50 / 50
Which of the following capacitors has relatively shorter shelf life____________?
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