Electrical Engineering Questions and Answers


41)

The most common type of ac motor is the

Answer: Option C

Explanation:

Because of variable speed 3-phase induction motors are mostly used.
42)

In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of

Answer: Option B

Explanation:

As we know the phase difference between any 2 phase is 120 deg, the phase angle between line voltage and phase voltage is 30 degree.
43)

Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by

Answer: Option A

Explanation:

Because the electrical difference in 3phase is 120degrees.
44)

Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω.

Answer: Option B

Explanation:

i=v/r
=120/15
=8A
but in single phase=  2*3phase current
=2*8
=16A
45)

A single-phase sinusoidal voltage of 120 V is connected to a 90 Ω load. Current in the circuit is

Answer: Option C

Explanation:

I=V/R=120/90=1.333A

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