Electrical Engineering Quiz 1
1 / 50
The hot resistance of the bulb?s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?
2 / 50
Approximate estimation of power demand can be made by_____________?
3 / 50
Maximum power loss occurs during_________________?
4 / 50
In a glass bulb mercury arc rectifier the maximum current rating is restricted to___________?
5 / 50
Which of the following motors is inherently self starting ?
6 / 50
To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them?
7 / 50
Oil switches are employed for_____________?
8 / 50
The value of ? for a transistor is generally____________?
9 / 50
In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then _______________?
10 / 50
Number of PN junction in an SCR is____________?
11 / 50
Direct conversion of heat into electrical energy is possible through____________?
12 / 50
A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy_______________?
13 / 50
A closed switch has a resistance of_____________?
14 / 50
Regenerative cycle thermal efficiency_______________?
15 / 50
Temperature co-efficient of resistance is expressed in terms of___________?
16 / 50
The first order control system, which is well designed, has a_______________?
17 / 50
N/C =_____________?
18 / 50
If/, R and t are the current, resistance and time respectively, then according to Joule?s law heat produced will be proportional to_______________?
19 / 50
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?
20 / 50
In medium sized induction motors, the slip is generally around___________?
21 / 50
The efficiency of diesel locomotives is nearly_______________?
22 / 50
In a transformer the resistance between its primary and secondary should be_____________?
23 / 50
Which of the following is the disadvantage of electric traction over other systems of traction ?
24 / 50
The most costly coupling is _______________ coupling?
25 / 50
?The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface?. The above statement is associated with_______?
26 / 50
The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________?
27 / 50
At the base-emitter junctions of a transistor, one finds___________?
28 / 50
Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them_____________?
29 / 50
There is a greater possibility of occurence of corona during______________?
30 / 50
Power transistor are type of___________?
31 / 50
Due to which of the following factors the brush wear rate is altered ?
32 / 50
During the idle period of the battery, strong electrolyte tends to change the active material of the cell into____________?
33 / 50
A rectifier with an external low pass filter is an example of______________?
34 / 50
The units of capacitance are____________?
35 / 50
In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of______________?
36 / 50
In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?
37 / 50
A synchronous motor can be made self starting by providing?
38 / 50
A _________ is used to measure the stator % winding temperature of the generator?
39 / 50
Harmonics in 3 phase inverters can be reduced by using___________?
40 / 50
A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is__________?
41 / 50
The core used in high frequency transformer is usually___________?
42 / 50
International ohm is defined in terms of the resistance of________________?
43 / 50
For cost and safety, the outdoor substations are installed for voltages above_________________?
44 / 50
Which of the following is the disadvantage of a synchronous condenser?
45 / 50
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?
46 / 50
A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement ?
47 / 50
Belted slip ring induction motor is almost invariably used for_________________?
48 / 50
An SCR combines the features of ____________?
49 / 50
Wave trap is used to trap waves of__________________?
50 / 50
The PIV rating of each diode in a bridge rectifier is ___________that of the equivalent center-tap rectifier?
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