Practice Three Phase Systems In Power Applications Multiple Choice Questions with Answers Quiz-2

Q.1.

In a ∆-connected source feeding a Y-connected load

Each phase voltage equals the difference of the corresponding load voltages
Each phase voltage equals the corresponding load voltage
Each phase voltage is one-third the corresponding load voltage
Each phase voltage is 60° Ωut of phase with the corresponding load voltage

Q.2.

In a three-phase system, when the loads are perfectly balanced, the neutral current is

Zero
One-third of maximum
Two-thirds of maximum
At maximum

Q.3.

The most common type of ac motor is the

Single-phase induction motor
Two-phase induction motor
Three-phase induction motor
Two-phase squirrel-cage motor

Q.4.

In a ∆-connected generator, all of the phase voltages are

Zero
Equal in magnitude
One-third of total
One-sixth of total

Q.5.

Power is measured in a three-phase load by using an ammeter.

True
False

Q.6.

A two-phase generator is connected to two 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

1.33 A
1.88 A
2.66 A
1.77 A

Q.7.

A three-phase generator is connected to three 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?

0 A
1.33 A
3.99 A
2.66 A

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