What are five reasons why electric motors are often the chosen type of power?
What will be an ideal response?
Electric motors are often the chosen type of power because (1) they are adaptable—motors can be used
in almost any location including underwater; (2) they are automatic—motors are easily controlled by
automatic devices; (3) they are compact—a small unit develops a relatively large amount of power; (4)
they are economical—a small motor operating at less than .25¢ per hour can do the work of several
humans; (5) they are dependable—electric motors selected specifically for the job seldom give trouble.
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In the accompanying figure, what does the selector switch permit?
What will be an ideal response?
Technician A says most limited-slip differentials rely on clutches that connect each side gear to the differential case. Technician B says the inward thrust of the side gears increases as wheel slippage increases. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technicians A nor B
Steam at 4 MPa and 400ºC flows through a 2-cm-diameter pipe. If the mass flux is 2 kg/min, the average velocity is nearest:
A) 10.8 m/s B) 9.8 m/s C) 8.8 m/s D) 7.8 m/s
Equipotential planes of electrical installations related to manmade bodies of water must be bonded to the electrical grounding system using an insulated, covered, or bare solid copper conductor no smaller than _____.
a. No. 6 AWG b. No. 8 AWG c. No. 12 AWG d. No. 16 AWG