法国号简谱轮机英语试题二十五

2021年1月19日发(作者：顾非熊)
试题二十五

一、单项选择题：

1.

In an ordinary diesel engine the fuel injection begins ______.

A.
after TDC





B.
before TDC







C.
after BDC















D.
before
BDC

2.

The supercharger takes air out of the surrounding atmosphere and then feeds it to the
engine's___.
A.
inlet valves



B.
exhaust valves



C.
emergency valves



D.
non-return valves

3.

With supercharging a larger mass of air is supplied to the cylinder by blowing it in under
pressure, which is the best means to ______of the engine.

A.
increase the exhaust temperature





B.
increase the power

C.
reduce the speed































D.
increase the fuel consumption

4.

Additives ______protective layers on metal surfaces guarding them against corrosion.

A.
damage








B.
form










C.
dissolve







D.
contaminate

5.

When fuel oil has seriously contaminated a diesel engine lubricating oil, you should ______.
A.
filter to remove the fuel oil
















B.
use the settler to remove the fuel oil

C.
remove the fuel oil by centrifuging



D.
drain and then renew the lube oil supply

6.

About half an hour before the engine is required, cooling water at ______must be circulated
in principle.

A.
more than the working temperature



B.
less than the working temperature

C.
the working temperature



















D.
the same as the surrounding
temperature

7.

The lubricating system for the cylinder walls is different from the bearings in that the oil for
former one is supplied in ______while that for latter one is ______.
A.
sufficient quantity / measured







B.
measured quantity/ sufficient

C.
excessive quantity/ sufficient








D.
the less quantity the better/the more the better

8.

The tendency for lubricating oil to thin out at high temperatures and thicken at low
temperatures will be characterized by a ______.
A.
low viscosity index























B.
high viscosity index

C.
high neutralization number











D.
low demulsibility quality

9.

Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be used if
any pipes are ______or if any soldered joints exit.

A.
chromed












B.
welded

























C.
galvanized






D.
bolted

10.

In the event of the cylinder starting valve leakage ______would pass into the air pipes and
ignite the oil deposited.

A.
cooling water




B.
vapor from the boiler



C.
starting air





D.
hot gases

11.

The difference between a supercharged engine and an un-supercharged engine is that ______
operates at an increased pressure.

A.
the later









B.
the latter








C.
the former







D.
the farmer

12.

______are fitted in the exhaust system and facilitate charge removal and scavenging in each
cylinder.

A.
Diffusers






B.
Compressors






C.
Steam boilers





D.
Soot blowers

13.

The power output of a turbocharged diesel engine will drop if the cooling water flow through
the after-cooler is interrupted because the ______.
A.
turbocharger stalls

























B.
exhaust pressure increases

C.
air charge density decreases










D.
scavenge effect increases

14.

An electrically driven automatically operating auxiliary blower is provided for slow speed
and ______of a low speed diesel engine.

A.
manoeuvring operations




B.
bad combustion




C.
cooling




D.
mooring trial

15.

The volute pump is one in which the impeller ______.
A.
discharges into a gradually widening channel





B.
has stationary diffuser vanes

C.
produces no kinetic energy


































D.
All of the above
are true.

16.

When operating with a negative suction head, which of the following types of pumps will
require priming?

A.
Reciprocating




B.
Centrifugal






C.
Rotary











D.
Gear

17.

In reference to air conditioning, when air attains the maximum amount of moisture it can
hold at a specific temperature, that is said to be ______.
A.
superheated







B.
saturated










C.
condensed






D.
convected

18.

A simple pumping system consists of a suction branch, a pump and______.

A.
a priming device




B.
a discharge branch





C.
a filter






D.
a suction valve

19.

The fire pumps must be capable of delivering a total quantity of water at a defined head , no
less than ______of the total bilge pumping capacity.

A.
one-third












B.
two-thirds









C.
one-fourth















D.

two-fourths

20.

Most marine biological sewage treatment plants consist of all the following statements except
___.
A.
aeration tanks




B.
settling tanks





C.
disinfection agent



D.
anaerobic
bacteria

21.

A donkey boiler is ______.

A.
one to supply steam to the main propulsion turbine



B.
an auxiliary boiler

C.
A and B







































































D.
neither A nor B

22.

Excessive vibration of an automatically fired auxiliary boiler can be caused by ______.
A.
air or water in the furnace


B.
combustion pulses


C.
fuel oil pump failure


D.

flame failure

23.

The amount of moisture in a given sample of air, when compared with the amount of
moisture the air could hold if totally saturated at the existing temperature of the sample, is
called ______.
A.
absolute humidity




B.
specific humidity




C.
effective humidity



D.
relative
humidity

24.

High-speed rotation in a centrifugal purifier can produce a force ______the force of gravity.

A.
many thousand times larger than












B.
the same as

C.
many thousand times smaller than









D.
none of the above

25.

Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture,
which causes them to join and ______in size.

26.

27.

28.

29.

30.

31.

32.

33.

34.

35.

36.

37.

38.

A.
expand












B.
extract



















C.
increase










D.

decrease

If air at 95
℃

dry bulb temperature and 50% relative humidity is conditioned to 75
℃

dry
bulb temperature and 50% relative humidity, it is an example of ______.
A.
cooling only



B.
cooling and humidifying
C.
cooling and dehumidifying

D.
adiabatic
cooling

A class
‘

C
’

fire would occur in ______.
A.
bedding











B.
pipe insulation






C.
paint















D.
a
generator

In a hydraulic system, ______are used to protect the system from over pressure.

A.
stop valves



B.
check valves




C.
safety valves



D.
reducing valves

What color is used to indicate the last shot of anchor chain?

A.
Red















B.
White














C.
Blue

















D.

Yellow

An axial piston pump differs from a radial piston pump as the pistons of an axial piston pump
are positioned______.
A.
radially from the shaft

B.
parallel to each other and to the shaft

C.
parallel to each other but at a right angle to the shaft

D.
at an angle to each other and to the shaft

Which is the pollution prevention equipment?

A.
booster pump




B.
evaporator








C.
incinerator








D.
cooler

In a vacuum boiling evaporator, the fresh water generated is pumped out by ______.
A.
a brine pump





B.
an air ejector




C.
a feed water pump




D.
a condensate
pump

The cooler as the liquid becomes, ______.
A.
the faster it will evaporate














B.
the slower it will condense

C.
the slower it will evaporate












D.
the faster it will flow

Sludge may form in the crankcase of an air conditioning compressor as a result of ______.
A.
bubbling refrigerant
























B.
overheating and oxidation

C.
lowered operating temperatures





D.
reducing the cloud or flash point

Differential pressures can be measured with the use of a ______.
A.
diaphragm type gage




B.
pressure transducer





C.
manometer





D.
all of the
above

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

The staring current of an a.c. motor is ______the rated current.

A.
the same as





B.
much larger than





C.
less than









D.
equals

You are attempting to parallel two AC generators and the synchroscope pointer is revolving
in the slow direction. This indicates that the frequency of the incoming machine is ______.
A.
higher than the bus frequency

B.
lower than the bus frequency

39.

40.

41.

42.

43.

44.

45.

46.

47.

48.

49.

C.
the same as the bus frequency but out of phase with it

D.
the same as the bus frequency, and the circuit breaker may be closed at any pointer
position

The main generators are connected to ______.

A.
distribution boards


B.
section boards


C.
emergency switch boards


D.
main
switch boards

The switchboards for A .C. systems differ from the D.C. switch gear in that the open type
panels are generally ______and the dead-front switch gear is the common rule.

A.
permissibly







B.
permissible











C.
no permissible



D.
not
permissible

Temperature measurement by instruments will give a value in degree Celcius. This scale of
measurement is normally used for all readings and temperature values ______dealing with
theoretical calculations involving the gas laws.

A.
in addition to





B.
in addition that




C.
except that









D.
except when

This arrangement is ______if the elements are directly connected to one another and the
control action takes place without human involvement.

A.
a manual closed loop






















B.
a manual opened loop

C.
an automatic closed loop
















D.
an automatic opened loop

The viscosity regulator controls the fuel oil temperature ______provide oil at the correct
viscosity for combustion.

A.
in order that





B.
because of







C.
in order to














D.
owing to

The resistance of electric wire will decrease as its ______.
A.
length increases























B.
cross-sectional area increases

C.
temperature increases














D.
percent of metallic purities increases

An accidental path of low resistance, allowing passage of abnormal amount of current is
known as a/an ______.
A.
open circuit






B.
short circuit




C.
polarized ground




D.
ground reference
point

Main diesel engine control can be obtained by the bridge ______.
A.
at any time

B.
only after the engine room control station is switched to
‘

bridge control
’


C.
whenever the secondary station is switched to
‘

bridge control
’


D.
whenever the engine side control station is switched to
‘

bridge control
’


Which of the following statements represents the main difference between a relay and a
contactor?

A.
Contactors control current and relays control voltage.

B.
A relay is series connected and a contactor is parallel connected.

C.
Contactors can handle heavier loads than relays.

D.
Contactors are made from silver and relays are made from copper.

Piston No. 2 of main engine has been removed, and it will be ______by noon tomorrow.

A.
lifted




















B.
reassembled







C.
dismounted




D.

disassembled

Defective air cooler in a diesel engine will lead to:

A.
smoky exhaust




B.
starting failure




C.
overload









D.
over speed