Wye-delta starting is accomplished by connecting the ____ in wye during the starting period and then reconnecting them in delta for normal run operation.
a. stator windings
b. overload relays
c. timer contacts
d. motor terminals
a. stator windings
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What is the major difference between shell and tube vs. plate and frame heat exchangers?
A) Plate and frame can achieve small temperature difference between fluids. B) Shell and tube exchangers do not need cleaning. C) Plate and frame heat exchangers are less expensive. D) Shell and tube must have equal flows for both fluids.
El radio de doblez máximo para el cable tipo MC con revestimiento corrugado se obtiene al multiplicar _____ veces el diámetro del cable.
a. 2 b. 4 c. 6 d. 8
Aftermarket parts catalogs can be a useful source of information and they are usually ________
A) Available for a fee on a secured Internet site B) Free C) Available on CD or DVD D) Available by paid subscription
How do technicians increase the blower speed in a belt-driven motor?
A) They loosen belt tension. B) They decrease pulley spread. C) They tighten belt tension. D) They increase the pulley spread.