Briefly explain the cooling technique provided by a totally enclosed, fan-cooled (TEFC) motor.
What will be an ideal response?
TEFC motors have external fins on the motor that radiate the heat to the motor surface. An external fan then blows ambient air over the fins to cool the motor. The fan is attached to the motor shaft and runs at the same speed as the motor shaft.
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A piece of sheet metal is punched as shown. Find the area remaining after the punching operation. Express the answer to the nearest hundredth.
The property of a material that causes it to oppose the movement of electrons is called ____________.
Fill in the blank(s) with the appropriate word(s).
A proper road test should include which of the following?
A) Driving in reverse while turning B) Driving beside stationary objects C) Driving on bumpy roads D) All of these are useful road test tips
Which of the following has become a nearly universal high-speed serial communications interface?
A. IP telephony B. xDSL C. USB port D. ASCII