單項(xiàng)選擇題A compound gauge is typically installed on the ().

A.suction side of a bilge pump
B.exhaust manifold of an auxiliary diesel
C.discharge line from an air compressor
D.chemical feed tank of an evaporator


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1.單項(xiàng)選擇題Which of the listed statements is correct concerning the starting of centrifugal pumps?()

A.They should always be started with the discharge valve closed
B.They should always be started with the discharge valve opened
C.A priming pump is always required to flood the impeller suction
D.They should always be started with the sealing line valves closed

2.單項(xiàng)選擇題Excessive oil foaming in the crankcase of a refrigeration compressor at start up can cause().

A.compressor damage from improper lubrication
B.refrigerant absorption by the lubricant
C.increased viscosity in the lubricant
D.carbon deposit on the compressor suction valves

3.單項(xiàng)選擇題Which of the valves listed is NOT considered to be a hydraulic system directional control valve?()

A.Spring-centered valve
B.Unloading valve
C.Three-position valve
D.Two-position valve

4.單項(xiàng)選擇題Which of the listed refrigeration system components keeps the refrigerant circulating through the system?()

A.Expansion valve
B.Condenser
C.Evaporator
D.Compressor

5.單項(xiàng)選擇題Which of the listed components is considered to separate the high pressure side of a refrigeration cycle from the low pressure side of the cycle?()

A.The condenser and the expansion valve
B.The king valve and the solenoid valve
C.The compressor and the expansion valve
D.The condenser and the solenoid valve