____ motors are designed to be used for jobs requiring minimum torque.
A. Series
B. Brushless DC
C. Stepping
D. Permanent magnet
Answer: C
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Confederate commerce-raiders such as the Alabama
A. were of little value. B. proved effective against Union shipping. C. were supplied by the French. D. lasted less than a year. E. operated mostly off the Atlantic coast.
Calculate the following:
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).
The estimated future market values and M&O costs for an in-place backup generator at MediCare Hospital and a possible replacement are shown below. Mrs. Jamison, Hospital Director, told you that she is interested only in what happens over the next 3 years. If the current generator is to be replaced, it must be done now or kept in-place for the 3 years. Using an interest rate of 10% per year and a 3-year study period, determine whether or not the replacement is economically advantageous now.
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A special-squirrel cage winding, called the ____________________ winding, is used to start a synchronous motor.
Fill in the blank(s) with the appropriate word(s).