6090 test 2 F+F

what is a non serviceable compressor called?

• semi-hermetic

• reciprocating

• hermetic

• open Drive

in the heat pump system where does the single connection pipe of the reversing valve connect?

• outdoor unit

• discharge line

• suction line

• indoor unit

what is the functioning of a thermostatic expansion valve?

• to maintain set superheat at the evaporator outlet

• to maintain constant evaporating temperature

• to equalize high and low pressure is during off cycle

• to maintain a constant evaporating Pressure

how is the liquid receiver sized?

• to provide adequate pump down capacity

• to contain overcharges of liquid refrigerant

• to balance system operating pressures

• to prevent liquid return it to the compressor

what type of condenser has the lowest condensing temperature?

• natural convection air cooled

• water cooled

• forced convection air cooled

• evaporative

what will the broken capillary tube of a TEV cause the valve to do?

• remain closed

• remain open

• open and close erratically

• flood the evaporator with liquid

what will be will be the effect, if the evaporating temperature on a DX evaporator is decreased from 0° C to -25° C?

• the cooling capacity will increase, rate of coil frosting will decrease

• the cooling capacity will increase, rate of coil frosting Will increase

• the cooling capacity will decrease, rate of coil frosting will increase

• the cooling capacity will decrease, rate of coil frosting will decrease

what does a dirty condenser in an air-conditioning system lead to?

• higher discharge pressure and high efficiency

• lower discharge pressure and low efficiency

• higher discharge pressure and lower efficiency

• lower discharge pressure and higher efficiency

what happens when the heat load on any evaporator decreases?

• the discharge pressure would increase

• the oil pressure will increase

• the suction pressure would increase

• the suction pressure would decrease

how can the evaporating temperature of a forced convection air cooling evaporator be estimated?

• air off evaporator 10° C

• air on to evaporator 10°

• air off evaporator -10 K

• air onto evaporator -10 K