船舶辅助机械题库 - 考试题库

【单选题】

[1/649]Which of the following statements is correct concerning the viscosity of lubricating oil?（）

A.

Viscosity will increase as temperature increases

C.

Viscosity will decrease as temperature decreases

D.

Viscosity is not dependent on temperature

参考答案：

B

参考解析：

无

【单选题】

[2/649]The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pre...

A.

system is low on refrigerant

B.

high pressure cutout switch is improperly adjusted

C.

discharge valves are leaking slightly

D.

discharge valves are leaking excessively

参考答案：

B

参考解析：

无

【单选题】

[3/649]In a ordinary cargo crane, （） is fitted to rotate the crane.

A.

the slewing motor

B.

the lulling motor

C.

the hoisting motor

D.

none of the above

参考答案：

A

参考解析：

无

【单选题】

[4/649]Which of the following pumps will build up a bursting pressure or stall the...

A.

（1）and（2）

B.

（1），（2）and（3）

C.

（1）and（3）

D.

（2）and（3）

参考答案：

C

参考解析：

无

【单选题】

[5/649]In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through ...

A.

a flash generator

B.

a flash evaporator

C.

a vacuum boiling evaporator

D.

a boiler

参考答案：

C

参考解析：

无

【单选题】

[6/649]Increasing the speed of a rotary pump above its rated speed will result in which of the following co...

A.

Loss of suction

B.

Increased clearances

C.

Decreased clearance

D.

creased slippage

参考答案：

B

参考解析：

无

【单选题】

[7/649]The static suction lift of a pump is the difference in elevation between the （）.

A.

centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump

B.

centerline of the pump and the suction liquid level when the source of liquid is above the pump

C.

centerline of the pump and the level of the discharge liquid

D.

liquid levels of the suction and discharge

参考答案：

A

参考解析：

无

【单选题】

[8/649]Among the basic categories of equipment, which of the following is used to convert hydraulic energy ...

A.

Hydraulic pumps

B.

Valve

C.

Hydraulic cylinders

D.

Hydraulic motor

参考答案：

D

参考解析：

无

【单选题】

[9/649]The usual number of single-acting pistons used in a variable stroke axial-piston pump is （）.

A.

3 or 5

B.

5 or 7

C.

7 or 9

D.

9 or 11

参考答案：

C

参考解析：

无

【单选题】

[10/649]A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.

B.

flood the evaporator

C.

open

D.

close

参考答案：

D

参考解析：

无