Power Distribution
Power Distribution
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Question 1 |
For residential areas, substation reduce the voltage from 120,000 volts down to
A | 8,400 volts |
B | 4,800 volts |
C | 5,200 volts |
D | 2,500 volts |
Question 2 |
For commercial areas, substations reduce the voltage from 120,000 volts down to
A | 34,000 volts |
B | 43,000 volts |
C | 52,000 volts |
D | 25,000 volts |
Question 3 |
A step down transformer will reduce the voltage to a common low voltage residential application of
A | 240 volts, single phase, 60 Hz |
B | 240 volts, three phase, 60 Hz |
C | 480 volts, single phase, 60 Hz |
D | 460 volts, three phase, 60 Hz |
Question 4 |
Using a delta transformer, commercial applications will step the voltage down to
A | 240 volts, single phase, 60 Hz |
B | 240 volts, three phase, 60 Hz |
C | 480 volts, single phase, 60 Hz |
D | 208 volts, three phase, 60 Hz |
Question 5 |
Using a wye transformer, commercial application will step down the voltage down to
A | 240 volts, single phase, 60 Hz |
B | 240 volts, three phase, 60 Hz |
C | 480 volts, single phase, 60 Hz |
D | 208 volts, three phase, 60 Hz |
Question 6 |
When measuring voltage using a voltmeter across an two hot legs of a low voltage wye transformer, it should read
A | 120 volts |
B | 240 volts |
C | 208 volts |
D | 40 volts |
Question 7 |
When measuring voltage on a low voltage delta system, what reading would be obtained across any two hot legs?
A | 120 volts |
B | 240 volts |
C | 208 volts |
D | 480 volts |
Question 8 |
Which three phase system, when measuring from L1, L2, and L3 to ground will read 120 volts?
A | 120 volt, three phase delta system |
B | 208 volt, three phase delta system |
C | 480 volt, three phase wye system |
D | 208 volt three phase wye system |
Question 9 |
Which three phase electrical system will measure 120 volts when testing two of the hot leads to ground and 208 on the third hot leg to ground?
A | . 460 volt, three phase delta system |
B | 240 volt, three phase delta system |
C | 480 volt, three phase wye system |
D | 208 volt, three phase wye system |
Question 10 |
On the wye transformer what voltage reading should be from L1 to L2
A | 240 volts |
B | 120 volts |
C | 208 volts |
D | 277 volts |
Question 11 |
On the wye transformer what voltage reading should be from L1 to ground?
A | 240 volts |
B | 120 volts |
C | 208 volts |
D | 480 volts |
Question 12 |
On a delta transformer what voltage reading should be from L1 to L2?
A | 240 volts |
B | 120 volts |
C | 208 volts |
D | 277 volts |
Question 13 |
On the delta transformer, what voltage reading should be from L1 to ground
A | 240 volts |
B | 120 volts |
C | 208 volts |
D | 480 volts |
Question 14 |
When placing a voltmeter across any two legs on a 480 volt three phase system, what voltage reading should be obtained?
A | 240 volts |
B | 208 volts |
C | 480 volts |
D | 277 volts |
Question 15 |
What is the maximum voltage output of a 240 volt single phase power supply?
A | 250 volt |
B | 240 volt |
C | 277 volt |
D | 264 volt |
Question 16 |
The typical electrical power received at a residence is _____.
A | 120VAC |
B | 120VDC |
C | 240VAC |
D | 240VDC |
Question 17 |
If a 9V battery produces a current of 3A through a load, the resistance of the load is _____.
A | 3 watts |
B | 3 ohms |
C | 2.7 ohms |
D | 27 ohms |
Question 18 |
A transformer with an input of 120 volts to the primary and an output of 180 volts from the secondary is a _____
transformer.
A | step-down |
B | step-up |
C | control |
D | induction |
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