Answer the following statement(s) true (T) or false (F)
1. If two phases of the supply to a three-phase induction motor are interchanged, the motor will stop.
2. The sensing network continuously monitors the motor line currents.
3. A built-in delay of five cycles prevents nuisance dropouts caused by fluctuating line voltages.
4. Motor protector modules feature phase forward.
5. Motor protector modules feature instantaneous fault protection.
1. FALSE
2. TRUE
3. TRUE
4. FALSE
5. TRUE
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Air flows at steady state through a horizontal, insulated pipe with inside diameter of 4 cm. A pressure drop results from flow through a partially opened valve. Just upstream from the valve, the pressure is 7 bar, the temperature is 45°C, and the average velocity is 20 If the pressure just downstream from the valve is 1.3 bar, what is the temperature? Assume for air that PV/T is constant,
= (5/2)R, and
= (7/2)R.
What will be an ideal response?
Which of the following describes a color temperature of 4,100K and higher?
a. Warm in tone enhancing reds and yellows b. Moderate in tone with a balance between warmth and coolness c. Cool in tone with a bias toward blues and greens d. Daylight simulating
The term R&R means _______
A) Remove and recondition B) Remove and repair C) Remove and replace D) None of these
Slip-form paving machines can place pavement at a rate of between _____
a. 3 to 5 feet per minute b. 6 to 12 feet per minute c. 16 to 20 feet per minute d. 24 to 28 feet per minute