GAT Subject Engineering MCQs

Inductive loads draw current that lags voltage.
Motors and transformers commonly produce lagging power factor.

Capacitors supply leading reactive power.
They reduce the reactive current drawn from the source.

KVL follows conservation of energy in a circuit loop.
Voltage rises and drops balance around the loop.

Transformers change voltage and current levels without changing frequency ideally.
They require alternating magnetic flux.

The same current flows through series resistors.
Equivalent resistance equals the sum of individual resistances.

Induced voltage is proportional to the number of turns.
Current changes inversely in an ideal transformer.

Parallel branches share the same voltage.
The equivalent resistance is lower than either branch resistance.

Transformer action requires changing flux to induce voltage.
Steady DC can also cause excessive winding current and heating.

Electrical power is the rate of energy transfer.
For DC circuits, P = VI.

Alternating flux causes hysteresis and eddy-current losses in the core.
Laminations reduce eddy currents.

A kilowatt-hour is energy consumed by one kilowatt for one hour.
It is a unit of energy, not power.

Current flowing through winding resistance produces heat.
Copper loss varies approximately with the square of load current.