單項選擇題The structural members of the hull extending in a fore and aft direction are called （）.

A.frames
B.joiners
C.longitudinals
D.knees


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1.單項選擇題Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.

A.pump bearings in poor condition
B.excessively worn actuator-piston packing
C.broken directional control valve centering springs
D.low hydraulic oil viscosity

2.單項選擇題Most solenoid valves are actuated by （）.

A.a spring
B.an electromagnet
C.the force of gravity
D.refrigerant pressure

3.單項選擇題When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.

A.viscosity will decrease
B.volume will increase
C.volume will decrease
D.pour point will be reduced

4.單項選擇題If the refrigeration compressor crankcase is sweating, the cause may be due to （）.

A.a shortage of refrigerant
B.the compressor running continuously
C.liquid refrigerant returning to the compressor
D.the compressor short cycling on the high pressure cutout

5.單項選擇題The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is （）.

A.evaporation is accomplished in a vacuum
B.due to the higher temperature of the incoming feed
C.due to the latent heat of evaporation principle
D.evaporation in a submerged medium produces more distillate