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Transmission And Distribution
Electronic Devices And Circuits
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A.C Fundamentals
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Voltage
Questions
The size of a transformer core will depend on
ক
frequency
খ
area of the core
গ
flux density of the core material
ঘ
(A) and (B) both
Short circuit test on transformers is conducted to determine
ক
hysteresis losses
খ
copper losses
গ
core losses
ঘ
eddy current losses
An electric filament bulb can be worked from
ক
D.C. supply only
খ
A.C. supply only
গ
Battery supply only
ঘ
All above
Ohm's law is not applicable to
ক
Semiconductors
খ
D.C. circuits
গ
Small resistors
ঘ
High currents
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
ক
9 times
খ
$$\frac{1}{9}$$ times
গ
$$\frac{1}{3}$$ times
ঘ
3 times
The speed regulation of a synchronous motor is always
ক
1%
খ
0.5%
গ
positive
ঘ
zero