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Electrical Engineering
Three Phase Systems In Power Applications
Quiz 2
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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
0 h : 0 m : 1 s
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