In a balanced three-phase system, the conductors need be only about _____ the size of conductors for a single-phase, two-wire system of the same kilovolt-ampere (kVA) rating.
A. 25 percent
B. 30 percent
C. 50 percent
D. 75 percent
Answer: D
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One-thousand moles of an ideal gas is compressed isothermally at 400 K from 100 kPa to 1000 kPa in a piston-cylinder arrangement. Calculate the entropy change of the gas, the entropy change of the surroundings and the total entropy change of the process for the following two cases:
(a) The process is mechanically reversible and the surroundings consist of a heat reservoir at 400 K. (b) The process is mechanically reversible and the surroundings consist of a heat reservoir at 300 K.
Individual wall spaces of __________ feet or more in width are considered usable for the location of a lamp or appliance, and a receptacle outlet is required.
a. 2 b. 4 c. 6 d. 12
Many people are fascinated by venomous snakes and some individuals keep them as pets. Venomous snakes require special permits, caging, and handling practices and should be kept only by trained professionals
A. True B. False
Technician A says that incandescent trouble lights may be used when working around gasoline. Technician B says that florescent trouble lights should be used when working around gasoline. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B