Using the rules for expressing SI units, correct each of the following if given incorrectly.
(a) 12 amps (f) 6.7 m/s/s
(b) 12.5 cm’s (g) 86.3 j
(c) 250 degrees Kelvin (h) 3 500 K
(d) 125.0 m m (i) 375 n
(e) 152 KW/hours (j) 4 225 pa
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The average sound level is 70 dBA, and the threshold of pain is reached at _____ dBA
a. 80 dBA b. 100 dBA c. 130 dBA d. 150 dBA
A higher SEER means ____.
A. lower efficiency and higher energy bills B. better efficiency and higher energy bills C. lower efficiency and lower energy bills D. better efficiency and lower energy bills
Which of the following is not true of permanent-magnet motors?
A. The main field flux is produced by permanent magnets. B. An electromagnet is used for the secondary field or armature flux. C. They has many of the characteristics of a wound rotor induction motor. D. They consist of permanent magnets mounted on a frame with a rotating armature placed between them.
The typical temperature drop through the chiller evaporator is ____°F.
A. 5 B. 10 C. 15 D. 20