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