The probability that a computer running a certain operating system crashes on any given day is 0.1. Find the probability that the computer crashes for the first time on the twelfth day after the operating system is installed.
What will be an ideal response?
Let X be the number of the day on which the computer crashes. Then Geom(0.1).
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A spreader bar is needed to lift trusses if the span exceeds _____.
a. 20' b. 30' c. 40' d. 50'
Does a person’s nose and mouth need to be buried in order to suffocate?
What will be an ideal response?
PM motors used in power windows, mirrors, and seats can be reversed by ________
A) Reversing the polarity of the current to the motor B) Sending current to a reversed field coil C) Using a relay and a two-way clutch D) Using a reverse relay circuit
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).