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