Plunger to barrel clearances are lapped in manufacture in port-helix metering injection pumps to tolerances between:
A. one half and one micron
B. two and four microns
C. six and eight microns
D. ten and twelve microns
Answer: B
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A simple insulated concentric tube heat exchanger is used to cool hot oil by transferring heat to water. Hot oil enters the center tube at 120°C, and a mass flow rate of 5.0 kg/s. The oil exits the heat exchanger at 80°C. Liquid water flows through the annulus surrounding the central tube. The water enters at 10°C.
(a) If the water exits at 50°C, determine the mass flow rate of the water. (b) Using your heat exchanger model to acquire the data, plot the required mass flow rate of the water for water exit temperatures ranging from 15°C to 75°C. Consider the specific heat of the oil to be 1.90 kJ/kg-K, and the specific heat of the liquid water to be 4.18 kJ/kg-K. Consider State 1 to be the oil inlet and State 2 to be the oil outlet. Consider State 3 to be the water inlet and State 4 to be the water outlet. Given: T1 = 120°C; m?oil = 5.0 kg/s; T2 = 80°C T3 = 10°C, T4 = 50°C Assume: Q?=0 (insulated). Also, given no other information regarding the heat exchanger, make the following common heat exchanger assumptions: W?=?KE=?PE=0 Also, assume the heat exchanger is a multiple-inlet, multiple-outlet, steady-state, steady-flow device. What will be an ideal response?
In residential applications, the available ground fault circuit current is seldom higher than _____.
a. 5,000A b. 10,000A c. 15,000A d. 65,000A
Which of the following sensors is commonly used on a Bosch Motronic system to allow the PCM to distinguish between engine misfire and an erratic crankshaft signal caused by rough road surfaces?
A. Chassis accelerometer B. MEMS gyrometer C. Yaw sensor D. VSS
Why do air conditioning evaporators normally operate at 40°F?
What will be an ideal response?