If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should _____.

A:increase the flow of the cooling water through the condenser B:adjust the high pressure cutout to maintain the desired pressure C:open the hot gas bypass temporarily to reduce capacity D:purge non-condensable gases to reduce the excess pressure

Which of the following best describes the thermodynamic effect on the pressure and volume relationship with regards to saturated gases?

A:As pressure decreases, volume increases B:As volume increases, pressure increases C:As volume decreases, pressure decreases D:AS pressure increases, volume increases

Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?

A:Pressure-reducing valve B:Unloading valve C:Counterbalance valve D:Pressure-relief valve

If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump _____.

A:capacity will increase B:capacity will decrease C:suction pressure will increase D:suction pressure will decrease

The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which ” means _____.

A:starters B:pressure switches C:pressure D:water

How are the pressure and temperature affected in a diesel engine cylinder during compression?

A:Pressure and temperature decrease B:Pressure and temperature increase C:Pressure decreases and temperature increases D:Pressure increases and temperature decreases

Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?

A:Constant volume B:Constant pressure C:Pulse pressure D:Radial flow

An increase in diesel engine crankcase pressure generally indicates excessive_______.

A:compression pressure B:lube oil header pressure C:scavenge air pressure D:piston ring blow-by

The average pressure exerted on piston during each power stroke is termed__________.

A:indicated horsepower B:mean effective pressure C:exhaust back pressure D:compression pressure

In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary? .

A:its pressure and temperature are both lowered B:its pressure and temperature are both raised C:its pressure is lowered and its temperature is raised D:its pressure is raised and its temperature is lowered