更多"In the suction stroke air is induce"的相关试题:
[单项选择]During the suction stroke, the piston is moving （）.
A. inwards
B. outwards
C. downwards
D. upwards
[单项选择]In the suction stroke, the crankshaft is rotating clockwise and the piston is moving （） the cylinderThe inlet valve is （） and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.
A. up；opened
B. down；open
C. up；closed
D. down；closed
[单项选择]Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）
A. supercharging
B. scavenging
C. turbulence
D. swept volume charging
[单项选择]The purpose of compressing the air within the cylinder of a diesel engine is to （）
A. produce the heat for ignition
B. decrease injection lag
C. increase ignition delay
D. aid in exhausting burnt gases
[单项选择](Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）
A. brake horsepower
B. displacement
C. cylinder volume
D. cylinder clearance
[单项选择]Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）
A. The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow
B. The pump packing gland overheats after short operating periods
C. The motor over-current protective device continually shuts the pump down
D. Pounding noises can be heard at the pump suction chest
[单项选择]When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
A. intake stroke
B. compression stroke
C. power stroke
D. exhaust stroke
[单项选择]In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）
A. the inlet port is opened by the up coming piston； the port is closed by the down going
B. the inlet valve is opened by the down going piston；the inlet valve is closed
C. the inlet port is opened by the down going piston；the port is closed by the up coming
D. the inlet valve is opened
[单项选择]The lube oil to lubricate the surfaces of the cylinder liners is spread over by the （）.
A. sliding piston rings
B. engines camshaft
C. small pumps
D. forced feed system
[单项选择]The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.
A. dividing walls
B. divided walls
C. dividing liners
D. divided jackets
[单项选择]The rate of fuel injection in a diesel engine cylinder depends primarily on （）.
A. the size of the holes in the fuel nozzle
B. timing of the pump
C. supply pressure to the pump
D. shape of the combustion chamber
[单项选择]The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the （）.
A. control rack
B. delivery valve
C. governor speed
D. plunger crossbar
[单项选择]During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）
A. piston skirt
B. pinion
C. crosshead
D. compression rings
[单项选择]Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）
A. less even torque
B. higher cylinder head temperatures
C. fewer power strokes per revolution
D. greater weight/size requirements
[单项选择]Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.
A. one size smaller than the pump suction nozzle
B. the same size as the pump suction nozzle
C. one size larger than the pump suction nozzle
D. installed with a short radius elbow at the pump
[单项选择]If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A. refrigerant overcharge
B. overfeeding by the expansion valve
C. a restricted suction strainer
D. due to short cycling of the compressor
[单项选择]The emergency bilge suction or bilge injection valve is used to prevent （） of the ship.
A. proceeding
B. overloading
C. collision
D. flooding
[单项选择]The emergency bilge suction valve is typically used （）.
A. to inject cleaning additives when the bilges are extremely dirty
B. when the main condenser becomes fouled, in order to provide additional cooling water circulation
C. to connect the rose box to the independent bilge suction
D. if the bilges become flooded and they can not be emptied by any other means
[单项选择]A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.
A. have a greater head capacity
B. operate with increased impeller efficiency
C. discharge through the suction side of the pump casing
D. require more power to run the shaft
