A gear type coupling is used:
A. for extremely heavy loads.
B. when the unit can't be moved.
C. where alignment is not critical.
D. none of the above.
B
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The framing component used to prevent joists from crippling at the load transfer point is a _____.
a. flange b. header c. web stiffener d. clip angle
A pressure-operated piston is used to open the ____ and permit more air to flow.
a. shutters b. valves c. contacts d. switches
To construct a confidence interval for each of the following quantities, say whether it would be better to use paired samples or independent samples.
a. The mean difference in height between identical twins. b. The mean difference in height between men and women. c. The mean difference in apartment rents between apartments in two different cities. d. The mean difference in apartment rents in a certain town between this year and last year.
A power factor of 1 indicates that the circuit phase angle is ________
A) 45° B) 90° C) 180° D) 0°