Why do standard design thermostatic expansion valves need a minimum pressure drop to operate correctly?
A) The pressure difference across the pin acts as an opening force.
B) The internal adjustment springs have a minimum required torsion.
C) To insure that the pin seats tightly during operation
D) The bulb will not sense temperatures below 100 psig.
A
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?A rapid-setting acrylic adhesive that polymerizes when pressure is applied to the joint is ____.
A. ?polyvinyl alcohol B. ?N,N-dimethylformamide C. ?cyanoacrylate D. ?polyvinyl butyral
Match each nation on the left with the correct description of the problem it presented for U.S. foreign relations following the Revolutionary War. A. Britain 1. threatened American commerce in the Mediterranean B. France 2. demanded repayment of wartime loans C. Spain 3. occupied a chain of trading forts in the Old Northwest D. Barbary Coast 4. controlled important trade routes from the interior of North America
A. A-1, B-3, C-2, D-4 B. A-2, B-4, C-1, D-3 C. A-2, B-2, C-3, D-4 D. A-3, B-2, C-4, D-1 E. A-4, B-2, C-1, D-3
At what relative speed must an inlet metering, opposed plunger injection pump be driven when used to fuel a 4-stroke cycle diesel engine, with 6 engine cylinders?
A. half engine speed B. engine speed C. two times engine speed D. six times engine speed
Technician A says that to deflate a truck tire, the Schrader valve plunger should be depressed until all of the air pressure is relieved. Technician B says that a Shrader valve is the only common component in vehicles ranging from a bicycle through automobiles and highway trucks. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B