Here is the "Electricity - Basic Navy Training Courses"
(NAVPERS 10622) in its entirety. It should provide one of the Internet's
best resources for people seeking a basic electricity course - complete with examples
worked out. See
copyright. See
Table of
Contents. • U.S. Government Printing Office; 1945 - 618779
Chapter 7 QUIZ
ELECTRICAL POWER
1. Does an empty lamp socket have force?
2. Is any work done by an open circuit?
3. Is any power consumed by an open circuit?
4. A generator supplies a 72 ampere load at 600 volts. What is the power consumed
by
the load in watts? In kilowatts? In hp?
5. A 50 hp motor draws 80 amperes at 600 volts. What is the power input? Power
output
in watts? Efficiency?
6. The prime mover of a generator furnishes 37 hp to the generator. The electrical
load on
the generator is 70 amperes at 440 volts. What is
the power input in watts? Power
output in watts? Efficiency?
7. A power line has a drop of 18 volts in transmitting a load of 75 amperes.
How much
power is lost in this line?
8. What is the resistance of the line in problem 7?
9. If a line consumes 650 watts in transmitting 55 amperes, what is the potential
drop?
10. How much power will be consumed by a 75 hp motor operating at 80 percent
efficiency?
In hp? In watts? In kilowatts?
Return to Chapter
7
Chapter 7 ANSWERS
ELECTRICAL POWER
1. Yes. There is an EMF present. It tries to force current
across the open circuit but cannot.
2. No, as long as no current flows it is a case of force
but no motion.
3. No. Again, force but no motion.
4.* 43,200 w. 43.2 kw.
57.9 hp.
5. 48,000 w. 37,300
w. 77.7 percent.
6. 27,602 w. 30,800
w. 89.6 percent.
7. 1,350 w.
8. 0.24 ohm.
9. 11.8 v.
10. 93.75 hp. 69,937.5
w. 69.94 w.
* The original manual gave this as an
incorrect answer: 16,128 w. 16,128
kw. 2.16 hp.
Thanks to Lou Nickles
for finding the error.
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