Chapter 14 Electrical Design and Wiring
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which of the following voltages might be used for lighting? Select all that apply. 1) _______
A) 120 V. B) 480 V. C) 208 V. D) 277 V.
2) During the 1980s, lighting power densities were higher than today. Which is a good comparison? 2) _______
A)
1980 4 W/ft2, 1990 2 W/ft2, now 1 W/ft2.
B)
1980 6 W/ft2, 1990 3 W/ft2, now 1 W/ft2.
C)
1980 6 W/ft2, 1990 3 W/ft2, now 2 W/ft2.
3) What is an appropriate power allowance for convenience outlets? 3) _______
A) 140 VA per duplex. B) 100 VA per duplex. C) 180 VA per duplex.
4) What is “connected load”? 4) _______
A) Loads that are expected to be in use at one time.
B) Sum of all electrical loads connected to the system, on or off.
C) Loads that are plugged in, excluding hardwired devices.
5) What factor might make a 120/208 V 3-phase 4-wire system more economical than a 120/240 V
single-phase 3-wire system?
5) _______
A) The 120/240 V system requires larger neutrals.
B) The neutral can serve up to 3 single-phase loads.
C) Most equipment is designed for 208 V.
6) Which of the following voltage selections are reasonable in a large building with a 277/480 utility
service? Select all that apply.
6) _______
A) 208 V, 1-phase appliances. B) 480 V, 3-phase motors.
C) 277 V, 1-phase lighting. D) 277 V, 1-phase receptacles.
7) Authoritative rules for electrical design and installation are contained in which of the following
documents?
7) _______
A) ASHRAE Handbook of Fundamentals.
B) NFPA 101.
C) NEC.
