What part should be replaced when servicing a wheel bearing on a non-drive wheel?
A) The bearing cup B) The cotter key
C) The grease seal D) Both the grease seal and the cotter key
D
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Which of the following improper operations does not pose a hazard of turbine shutdown?
A. Steam leaks B. High-discharge steam pressure C. Failure to maintain sufficient inlet steam pressure D. Running a turbine at a speed above or below the normal operating conditions
The horticulture business will slowly decline over the next decade
Indicate whether the statement is true or false
Why are split-system installation valves typically NOT used following installation?
A) They do not control flow to service ports. B) They are usually stuck in the closed position. C) They limit flow to the service ports. D) They are usually stuck in the open position.
a. A three-phase, 220-V, 60-Hz induction motor runs at 1,140 r/min. Determine the number of poles (for minimum slip), the slip, and the frequency of the rotor currents.
b. To reduce the starting current, a three-phase squirrel cage induction motor is started by reducing the line voltage to Vs/2. By what factor are the starting torque and the starting current reduced?