更多"Which of the terms listed below rep"的相关试题:
[单项选择]Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）
A. Lube oil passing through the system
B. Moisture or foreign matter collecting at the valve seat and orifice
C. Variable spring tension caused by the changing temperature
D. Frost on the liquid line
[单项选择]Which of the conditions listed represents the greatest effect of excess frost accumulation on the evaporator coils?（）
A. Keeps the refrigerated space cooler
B. Reduces the efficiency of the plant
C. Takes the load off the compressor
D. Has no affect on the system
[单项选择]Which of the listed effects represents the purpose of heat treating steel?（）
A. Develop ductility
B. Improve machining qualities
C. Relieves stresses
D. All of the above
[单项选择]Which of below device has the maximum coverage range（）
A. AIS
B. Radar
C. VHF
D. LRIT
[单项选择]Which conditions will normally cause a SART to operate in the active mode?（）
A. It will respond only to interrogation by 9-Ghz radar signals
B. A SART will normally respond to interrogation from a searching vessel's radar if the radar antenna is at least 15 meters high
C. A SART will normally respond to interrogation from a searching aircraft's radar if the radar's output power is at least 10，000 watts and the aircraft is at a height of 3000 feet and within 30 nautical miles
D. All of the above
[单项选择]Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? （）
A. Hydraulic stress and distortion will develop
B. Hot spots will develop
C. Fuel oil viscosity will increased
D. An increase in trapped deposits of scale and dirt
[单项选择]Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?（）
A. Latent heat of vaporization
B. Heat of compression
C. Superheat
D. All of the above
[单项选择]Which of the following terms would best describe the temperature at which a liquid boils at a given pressure?（）
A. Degree of saturation
B. Saturation temperature
C. Superheated temperature
D. Degree of superheat
[单项选择]Which of the following terms is used to identify the pressure of the liquid entering a pump?（）
A. Suction head
B. Pump head
C. Discharge head
D. Total head
[单项选择]Which of the following terms could be applied to the simple definition the energy of motion?（）
A. Electrical energy
B. Thermal energy
C. Potential energy
D. Kinetic energy
[单项选择]Which of the following conditions can cause below normal air pressure in the intake manifold of a turbocharged diesel engine?（）
A. Excessive piston blow-by to the manifold
B. Insufficient cooling water flow
C. Accumulated water in the air boxes
D. Clogged air intake filters
[单项选择]Which of the motors for the devices listed below is fitted with an instantaneous overload relay?（）
A. Fan
B. Pump
C. Winch
D. Machine tool
[单项选择]A centrifugal pump vibrates excessively during operationUpon disassembling the pump it is found that the impeller is out of balanceWithout an available spare, you should （）.
A. drill holes through the heavy side of the impeller until it balances
B. weld counterweights to the light side of the impeller
C. remove metal from the heavy side by machining in a lathe
D. acid wash and serape the heavy side until it balances
[单项选择]An overcorrecting and unstable engine governor operation is known as（）.
A. droop
B. dead banding
C. dash potting
D. hunting
[单项选择]A portable foam fire extinguisher is placed in operation by（）
A. turning it upside down
B. pressing the foam lever
C. squeezing the grip handle
D. opening the hose valve
[单项选择]The crankcase cover should never be allowed to open for investigation when （）
A. the engine stops
B. the engine is running
C. you repair the engine
D. overhauling the engine
[单项选择]When ship navigating in rough sea, the correct operation is （）
A. navigating with a low diesel engine speed
B. navigating with a stable diesel engine speed
C. increasing the efficiency of propeller
D. increasing fuel injection
[单项选择]The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.
A. crankshaft
B. camshaft
C. piston rod
D. rack and pinion
