When refrigerants are exposed to glowing metal surfaces or flames:
A) Best practices require the use of proper eye protection.
B) Lethal phosgene gas is produced.
C) A respirator capable of filtering fine dust must be worn.
D) Carbon monoxide is produced and should be vented.
B
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____ are drawings that show height.
A. Plans B. Prints C. Elevations D. Topographies
Convert a pressure of 10 psi to inches of mercury. How many mercury inches is the pressure?
A) 50 inches of mercury B) 100 inches of mercury C) 20 inches of mercury D) 15 inches of mercury
__________ is the current, in amperes, that a conductor can continuously safely carry.
What will be an ideal response?
Calculate the following:
A three-phase, 480 V, six-pole, Y-connected, 60 Hz, 10 kW induction motor is
driving a constant torque load of 60 Nm. The parameters of the motor are:
a. Motor torque.
b. Motor current
c. Starting torque
d. Starting current
A voltage is injected in the rotor circuit to reduce the motor speed by 40%.
e. Calculate the magnitude of the injected voltage.
f. Repeat (a) to (d) for the motor with injected voltage.
g. Calculate the power delivered to the source of injected voltage.
h. Determine the overall efficiency of the motor (ignore rotational and
core losses).