RCDD Ch9 Power Distribution Exam Questions and Answers Solved Correctly
Calculate the real power in watts needed to deliver 5 amperes of current in a 120 Volt ac circuit. The
power factor for the circuit is 0.8.
A - 480 W
B - 600 W
C - 750 W
D - 900 W
Page 9-13 - Answers A
If the real power consumed by a load is 2000 W and the power factor is 0.8, how many tons of air
conditioning is required to maintain ambient temperature in the space where the load is located?
A - ≈ 0.3 tons
B - ≈ 0.6 tons
C - ≈ 0.75 tons
D - ≈ 1 tons
Page 9-13 - Answers B
What type of fluctuation is caused by an increase in the nominal voltage or current lasting from 0.5
cycles to one minute?
A - Swell
B - Sag
C - Overvoltage
D - Transients/Surge
, Page 9-20 Table 9.3 - Answers A
Which of the following is a method of connection for primary or secondary windings of a three-phase
transformer bank in which similar ends of each phase winding are connected together at a common
point, which forms the electrical neutral and is grounded (earthed) at the building grounding (earthing)
electrode system?
A - Wye
B - Delta
C - Split
D - Monocyclic
Page 9-3 - Answers A
You are designing a system that requires an uninterruptible load transfer of small branch circuits. What
type of transfer switch would be needed for this transfer requirement?
A - Point of use switch
B - Standalone transfer switch
C - Integral isolation transformer and power PDU
Page 9-54 - Answers A
You have been asked to review specifications for the conductors and protection devices for a project.
Upon calculating the information you notice that the feeder and branch circuits have been sized
correctly to support the non continuous load plus:
A - 25% of the continuous load
B - 50% of the continuous load
C - 100% of the continuous load
D - 125% of the continuous load
Calculate the real power in watts needed to deliver 5 amperes of current in a 120 Volt ac circuit. The
power factor for the circuit is 0.8.
A - 480 W
B - 600 W
C - 750 W
D - 900 W
Page 9-13 - Answers A
If the real power consumed by a load is 2000 W and the power factor is 0.8, how many tons of air
conditioning is required to maintain ambient temperature in the space where the load is located?
A - ≈ 0.3 tons
B - ≈ 0.6 tons
C - ≈ 0.75 tons
D - ≈ 1 tons
Page 9-13 - Answers B
What type of fluctuation is caused by an increase in the nominal voltage or current lasting from 0.5
cycles to one minute?
A - Swell
B - Sag
C - Overvoltage
D - Transients/Surge
, Page 9-20 Table 9.3 - Answers A
Which of the following is a method of connection for primary or secondary windings of a three-phase
transformer bank in which similar ends of each phase winding are connected together at a common
point, which forms the electrical neutral and is grounded (earthed) at the building grounding (earthing)
electrode system?
A - Wye
B - Delta
C - Split
D - Monocyclic
Page 9-3 - Answers A
You are designing a system that requires an uninterruptible load transfer of small branch circuits. What
type of transfer switch would be needed for this transfer requirement?
A - Point of use switch
B - Standalone transfer switch
C - Integral isolation transformer and power PDU
Page 9-54 - Answers A
You have been asked to review specifications for the conductors and protection devices for a project.
Upon calculating the information you notice that the feeder and branch circuits have been sized
correctly to support the non continuous load plus:
A - 25% of the continuous load
B - 50% of the continuous load
C - 100% of the continuous load
D - 125% of the continuous load
