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).
h. Overall efficiency: Ignoring the rotational losses and the core losses.
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All of the following statements are true EXCEPT:
A. diodes must be in good condition if the AC generator is to function correctly. B. one or more leaking diodes will decrease generator output. C. if more than 0.2 AC volt is found in the B+ output, defective diodes are indicated. D. diodes prevent AC from leaving the AC generator in the B+ output wire.
A(n) ____________________ spring is made of a long, flat strip of spring steel or composite fiber rolled at both ends to accept a pressed-fit rubber insulating bushing.
Fill in the blank(s) with the appropriate word(s).
Give the decimal equivalent of 4%.
A. 0.0004 B. 0.004 C. 0.04 D. 4
A data acquisition system is generally a(n) ____ that allows for the direct connection of process sensors.
a. output device b. self-contained circuit c. fiber optic cable d. EtherNet network