网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
Reducing the clearance between a valve stem and rocker arm will result in the valve （）
A
having a shorter duration of opening
B
having a longer duration of opening
C
closing sooner
D
opening later
参考答案
参考解析
解析：
暂无解析
更多 “单选题Reducing the clearance between a valve stem and rocker arm will result in the valve （）A having a shorter duration of openingB having a longer duration of openingC closing soonerD opening later” 相关考题
考题
Reducing the gap between rich and poor is one of the main _______ facing the government.A、chancesB、challengesC、chainsD、changes
考题
单选题The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）A
clogged fuel injection pumpsB
increased cylinder liner wearC
intake valve stem corrosionD
varnish deposit on pistons
考题
单选题Reducing the clearance between a valve stem and rocker arm will result in the valve （）A
having a shorter duration of openingB
having a longer duration of openingC
closing soonerD
opening later
考题
单选题If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）A
valve will open laterB
valves will close laterC
amount of fuel injected will be increasedD
amount of fuel injected will be decreased
考题
单选题The（） is fitted in pair one is the main valve, the other the auxiliary or standby.A
main stem stop valveB
auxiliary steam stop valveC
feed check or control valveD
blow down valve
考题
单选题A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.A
a pressure reducing valveB
a pilot valveC
an operating pistonD
downstream pressure
考题
单选题Air or noncondensable gas is removed from a refrigeration system by a （）A
separating chamberB
system of bafflesC
purge valveD
vacuum reducing valve
考题
单选题The scale trap is located between the （）A
king valve and the expansion valveB
solenoid valve and expansion valveC
evaporator and receiverD
compressor and evaporator
考题
单选题If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）A
excessively late injection timing for each cylinderB
incorrectly adjusted intake valve timingC
incorrectly adjusted fuel injectorD
incorrectly adjusted intake valve clearance
考题
单选题With the shell and cap assembled as for running, a check must be made that the clearance between the cap and the housing （）.A
has a nipB
is large enoughC
is zeroD
are suitable
考题
单选题The（）enables water to be blow down or emptied from the boilerIt may be used when partially or completely emptying the boiler.A
main stem stop valveB
auxiliary steam stop valveC
feed check or control valveD
blow down valve
考题
单选题When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）A
overloading the engineB
low exhaust valve liftC
excessive cylinder coolingD
insufficient mechanical clearance
考题
单选题Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening （）A
later and closing earlierB
later and closing laterC
earlier and closing earlierD
earlier and closing later
考题
单选题A gate valve installed in a pipeline should be （）.A
used in either the fully dosed or fully opened positionB
installed with the stem downC
used for steam service onlyD
used to throttle or regulate the flow of liquid
考题
单选题What is the purpose of a striker plate? （）A
Provides surface for applying force on machineryB
Provides landing surface for the sounding bobC
Absorbs machinery vibrationD
Prevents valve stem over-travel
考题
单选题The clearance volume for a single stage compressor is defined as the space created between the （）.A
top of the piston and bottom side of head, with the piston at BDCB
piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCC
bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placementD
top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
考题
单选题The（） is a smaller valve fitted in the auxiliary steam supply line, and is usually of the non-return type.A
main stem stop valveB
auxiliary steam stop valveC
feed check or control valveD
blow down valve
考题
单选题Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.A
during the valve overlap periodB
with only the exhaust valve openC
at a pressure below atmosphericD
without cooling the cylinders or pistons
考题
单选题A built-up exhaust valve is one in which （）.A
the stem and heads are made of different materialB
low-alloy steel is used throughoutC
a replaceable valve disk is welded to the headD
the self-centering action comes from motion of the valve stem in the guide
考题
单选题Valve lash, or clearance refers to the （）A
clearance between the top of the valve stem and the rocker armB
compression of the valve springsC
clearance between the valve seat inserts and the headD
out of roundness of the fuel injection cams
考题
单选题The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）A
the firing pressure in the cylinderB
a metering helix inside the pumpC
varying the physical length of the plunger strokeD
varying the clearance between the injector cam and the injector rocker arm
考题
单选题Please draw out a 01 mm （） between the two halves of the bearing to reduce the clearance.A
shimB
gasketC
washerD
packing
考题
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）A
worn valve seatsB
worn main bearingC
excessive valve clearanceD
weak rocker arm springs
考题
单选题An air compressor can be unloaded at start-up by （）.A
holding the discharge valve openB
relieving the intercooler pressure to the atmosphereC
using an enlarged, permanently opened clearance expansion spaceD
a pre-charged accumulator
考题
单选题Which of the following problems may occur if the clearance between a piston and cylinder liner is insufficient?（）A
Excessive wearB
Scuffing of the linerC
Piston seizureD
All of the above
考题
单选题Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）A
closing laterB
opening soonerC
staying open for a shorter period of timeD
staying open for a longer period of time
考题
单选题During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by （）A
chief engineerB
surveyorC
the engineerD
the technique personnel of the shipyard
考题
单选题Which of the listed devices would be installed at a control system air pressure reducing station?（）A
Moisture separatorB
Vacuum breakerC
LubricatorD
Non-return valve
热门标签
最新试卷