E3AP - EE 25
Electrical Engineering Mastery Quiz
Test your knowledge and skills in Electrical Engineering with our comprehensive quiz designed for aspiring engineers and seasoned professionals alike. This quiz covers a wide range of topics, including circuit theory, transformers, induction motors, and more!
- 12 challenging multiple-choice questions
- Instant feedback on your answers
- Suitable for students and professionals
If both the resistance and the inductance in an LR series circuit are double the new inductive time constant will be ______.
Unchanged
Twice the old
Four times the old
Half the old
During short-circuit test, the iron loss of a transformer is negligible because:
The entire input is just sufficient to meet Cu losses only.
Iron core becomes fully saturated.
Supply frequency is held constant.
Flux produced is a small fraction of the normal flux.
Surge absorbers protect against ___________ oscillations.
Low voltage high frequency
High voltage low frequency
High voltage high frequency
Low voltage low frequency
The main factor which loads to unstable parallel operation of flat- and over-compound dc generators is:
Unequal speed regulation of their prime movers.
Unequal series field resistances.
Their rising voltage characteristics.
Unequal number of turns in their series filed windings.
Which of the following is the disadvantage due to low power factor?
High cost of equipment for a given load
Increased transmission losses
Poor voltage regulation
All of the choices
When the load at the receiving end of a long transmission line is removed, the sending end voltage is less than the receiving end voltage. This effect is known as ____ effect.
Proximity
Kelvin
Ferranti
Faraday
A periodic function has zero average value over a cycle and its Fourier series consists of only odd cosine terms. What is the symmetry possessed by this function?
Even quarter-wave
Odd quarter-wave
Odd
Even
During load shedding:
System frequency is reduced.
Some loads are switched off.
System voltage is reduced
System power factor is changed.
The effect of increasing the length of air-gap in an induction motor will be to increase the _______.
Magnetizing current
Air-gap flux
Speed
Power factor
A cylindrical copper rod has resistance R. It is reformed to twice its original length with no change of volume. Its new resistance is ______.
8 R
4 R
2 R
R
In a 3-ϕ induction motor, the rotor field rotates at synchronous speed with respect to _____.
Stator flux
None of the choices
Rotor
stator
As an externally generated magnetic field through a certain conducting loop increases in magnitude, the field produced at points inside the loop by the current induced in the loop must be:
Decreasing the magnitude
In the same direction as the applied field
Directed opposite to the applied field
Increasing the magnitude
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