Electrical Engineering Quiz 48
1 / 50
The metallic spheres A and B of radii 2m and 4m respectively carry the same charge 4 x 10 8 If the spheres are connected by a copper wire_______________?
2 / 50
A transformer can have zero voltage regulation at______________?
3 / 50
In case of conductively compensated D.C. series motors, the compensating winding is provided______________?
4 / 50
Transformer coupling is used for__________amplification?
5 / 50
In a simple magnetic field the strength of magnet flux_______________?
6 / 50
For commutation in three phase PAC, normally balanced three phase voltages VR, VY and VB are connected to the three legs of the converter via______________?
7 / 50
A field line and an equipotential surface are____________?
8 / 50
The power factor of a single-phase induction motor is usually?
9 / 50
Life of the batteries is in the following ascending order____________?
10 / 50
If two sine waves of the same frequency have a phase difference of JT radians, then_______?
11 / 50
In a certain low-pass filter, fc = 3.5 kHz.if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?
12 / 50
The purpose of a coupling capacitor in a transistor amplifier is to ___________________?
13 / 50
The diameter of the rotor shaft for an electric motor depends on which of the following ?
14 / 50
In an induction motor if air-gap is increased__________?
15 / 50
For the transmission of heat from one body to another__________?
16 / 50
. If =0.98 ,Ico=6?A and I?=100?A for a transistor,then the value of Ic will be______?
17 / 50
Conductance is reciprocal of____________?
18 / 50
Interruption of large currents by relay requires______________?
19 / 50
Ferrites are materials
20 / 50
Sulphated cells are indicated by____________?
21 / 50
Which method can be used for absolute measurement of resistances _______________?
22 / 50
Transformer coupling is generally employed when load resistance is______________?
23 / 50
Method which is commonly applied for unloading the coal for small power plant is___________?
24 / 50
The efficiency of an electrolytic rectifier is nearly____________?
25 / 50
A rotory converter can also be run as a___________?
26 / 50
It is advisable to avoid line-starting of induction motor and use starter because__________?
27 / 50
Paramagnetic materials have relative permeability________________?
28 / 50
When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?
29 / 50
The minimum dielectric stress in a cable is at_____________?
30 / 50
The purpose of stator winding in the compensated repulsion motor is to_____________?
31 / 50
In case of impulse steam turbine_____________?
32 / 50
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is___________?
33 / 50
The bandwidth of a single stage amplifier is_____________that of a multistage amplifier?
34 / 50
In the circle diagram for induction motor, the diameter of the circle represents____________?
35 / 50
The value of E within the field due to a point charge can be found with the help of___________?
36 / 50
Which of the following is unit of inductance ?
37 / 50
In a capacitor the electric charge is stored in____________?
38 / 50
When a rectangular voltage waveform is applied to a capacitor, then the current waveform is ______________?
39 / 50
Due to which of the following reasons a synchronous motor fails to pull into synchronism after applying D.C. field current?
40 / 50
__________________can be extended to systems which are time-varying ?
41 / 50
A Weston synchronoscope is a________________?
42 / 50
Armature reaction in a generator results in_____________?
43 / 50
Conductivity is analogous to____________?
44 / 50
For forced draught system, the function of chimney is mainly_____________?
45 / 50
Which of following is normally ON device?
46 / 50
An npn BJT has gm=38mA/v, c? =10?14 F, c? =10?13F and DC current gain ?0=90.For this transistor fT & f? are________?
47 / 50
__________ will be least affected due to charge in supply voltage frequency.
48 / 50
At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V.the filter?s bandwidth is____________?
49 / 50
Induction cup relay is operated due to changes in________________?
50 / 50
If d.c. supply of 10 V is fed to a differentiating circuit, then output will be_______________?
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