RCDD CHAPTER 9 POWER DISTRIBUTION
TEST 2025
A - ANSWER Find the true power in watts needed to supply 5 amperes of
current in a 120 Volt ac circuit. The power factor of the circuit is 0.8.
A - 480 W
B - 600 W
C - 750 W
D - 900 W
Page 9-13
B - ANSWER If a load consumes 2000 W of real power and the power factor
is 0.8, how many tons of air conditioning would be needed to maintain ambient
temperature in the space in which the load is located?
A - ≈ 0.3 tons
B - ≈ 0.6 tons
C - ≈ 0.75 tons
D - ≈ 1 tons
Page 9-13
A - ANSWER 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
A - ANSWER 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
A - ANSWER 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
TEST 2025
A - ANSWER Find the true power in watts needed to supply 5 amperes of
current in a 120 Volt ac circuit. The power factor of the circuit is 0.8.
A - 480 W
B - 600 W
C - 750 W
D - 900 W
Page 9-13
B - ANSWER If a load consumes 2000 W of real power and the power factor
is 0.8, how many tons of air conditioning would be needed to maintain ambient
temperature in the space in which the load is located?
A - ≈ 0.3 tons
B - ≈ 0.6 tons
C - ≈ 0.75 tons
D - ≈ 1 tons
Page 9-13
A - ANSWER 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
A - ANSWER 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
A - ANSWER 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
