問題一覧
1
Air compressor cylinder unloader enable the compressor to?
start and come up to speed before air compression begins
2
How does a quick closing valve operate?
the valve bridge is collapse remotely allowing the valve to close
3
As found in a basic pneumatic automatic combustion control system, the function of standarizing relay is to ______.
introduce a control for maintaining constant steam pressure regardless of boiler load
4
In order to move the rudder, what must be created by steering gear?
Torque
5
The cooling effect in a refrigeration system is produced by _____.
lowering the pressure of the refrigerant
6
Which of the following purpose of a safety valve fitted in the cylinder cover of a diesel engine?
To release excessive gas pressure from the cylinder
7
In a large, low speed diesel engine the clearance between the piston crown anf cylinder head is found to be excessive. In order to correct for this,you should ______.
insert shims between the crankpin bearing box and the connecting rod foot.
8
What is the reason why steam pressure reduces its pressure while accomplishing work in the engine or turbine?
The steam expands in volume
9
When a fuel injection nozzle overheated which of the problems listed below can be expected?
The fuel metering will vary
10
According to Regulations, a power driven auxiliary steering gear for a vessel capable of a 12 knot service speed, must be able to meet the rudder movement requirements at which of the minimum vessel speeds listed below ?
7 knots
11
Salinity cell is installed in the distilling unit to indicate the ?
quality of water produced
12
An electric motor failure in an electro-hydraulic steering gear system would cause the rudder to _______.
remain locked in its last position
13
If you were operating a centrifugal water service pump with worn wearing rings, the _____.
pump would develop insufficient flow
14
It is possible to mount a double suction centrifugal pump impeller with the vanes facing the wrong direction. This would cause the pump _______.
efficiency to decrease
15
Where is the temperature of the refrigerant highest?
At the compressor discharge.
16
What is the use of steam control valves installed in the auxiliary exhaust line?
Control steam admission and maintain the proper steam spray pattern in the DC heater
17
The difference between the setpoint and the measured parameter in an automatic flow controller is called.
Error
18
The function of a centrifugal pump double volute casing is to?
reduce radial thrust on the impeller
19
The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relationship, the camshaft drive causes the camshaft to rotate at?
crankshaft speed in a two-stroke cycle diesel engine
20
An air compressor can be unloaded at start up by?
relieving the intercooler pressure to the atmosphere
21
In case Engine room is unmanned and Diesel Engine is running, when the temperature cooling water outlet is one degree above the limit in long period of time. What is the next immediate better thing to do?
check the setting of temperature controller
22
What precaution should be observed to prevent damage of the service pump when warming up the fuel system to the boiler is to ?
close the recirculating valve when atomizing temperature is reached
23
At what temperature in degree Celsius will safety devices called fusible plug installed in air compressor or compressed air system melts in order to prevent explosion?
100
24
The bore of a diesel engine describes the ?
diameter of the cylinder
25
The dehydrator of a refrigeration system is located?
before expansion valves
26
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce?
carbon accumulation on the nozzles
27
The boiler feedwater control valve varies the relationship between steam and water flow during periods of ?
steady boiler load
28
Humidity is the measure of the?
water vapour content
29
Which of the following is a function of burner atomizing steam?
impart swirling motion of the oil for efficient combustion
30
The greatest decrease in the temperature of a refrigerant is at the _____
expansion valve
31
Which of the following controls the amount of fuel atomized by a return flow oil burner?
Fuel oil return valve
32
A centrifugal pump may fail to deliver water when first started if the _____.
pump is not primed
33
Breaking the fuel into fine spray to provide good combustion is called ______.
atomizing
34
In the boiler s combustion control system, when the demand for steam is increased ________.
air supply increases before fuel supply increases
35
The function of hydraulic telemotor transmitter used in an electro hydraulic steering gear system is to _____.
transmit the rudder angle to the bridge indicator
36
In a refrigeration system how do you clean the oil filter?
pulling out and clean vwith chemical
37
The capacity of a rotary pump will decrease with an increase in the pump
rotor clearance
38
The set point pressure at which the boiler safety valve is to lift to?
Maximum steam drum pressure
39
In a refrigeration system, the amount of refrigerant admitted to the evaporator is directly related to ______.
the superheatof the refrigerant in the tail coil
40
Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by?
a liquid seal
41
Excess refrigerant in a refrigeration system is normally removed from the _____.
charging connections of the system
42
What will happen if the needle valve in a fuel injection nozzle sticks open?
The nozzle will overheat
43
Increasing the speed of a centrifugal pump will result in an increase in the pump capacity. Another means of increasing the total head pressure of a centrifugal pump is to increase the ?
diameter of the impeller
44
The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the ?
connecting rod or piston rod
45
Which of the following methods is used to counter axial thrust in a single flow reaction turbine?
A dummy piston and cylinder at the turbine inlet end
46
What is the most effective way of detecting any malfunction of machinery during their operation?
Electric siren
47
One of the major components of centrifugal pump is?
impeller
48
Scavenging trunks are more prone to fire because they are?
accumulating oily substance
49
Which of the following will happen if the fuel oil heater attains excessively high temperature ?
Carbon deposits will build up in the surfaces
50
In a diesel engine, an integral liner is one in which the cooling water _______. I through the cylinder liner jackets II. Touches the outer side of the liner
flows through the cylinder liner jackets
51
KPa is equivalent to?
7.5 mm of Hg
52
On a medium pressure, differential piston, reciprocating air compressor, lubrication of the pistons/cylinders is usually accomplished ________.
with metering type cylinder lubricators
53
If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the ______.
control air system
54
The most common diesel engine fuel system problems are caused by ?
dirty fuel
55
The high pressure cut-out switch will stop the refrigeration compressor when there is?
a stoppage of condenser cooling water flow
56
The action should take when water is found in the fuel oil setting tank is to ?
shift pump suction to an alternate settling tank
57
What is the use of follow-up gear on an electro-hydraulic steering gear?
Takes the pump off stroke when the desired rudder angle is attained
58
Gas turbine has operational flexibility. Which of the following is the reason?
Swift start up me warm or idling period required
59
Why should the boiler fire side be kept free from soot accumulations?
soot insulates the boiler heating surfaces
60
What type of pump is used in the steering gear of modern ship?
Vane
61
Which of the following admits air to the piston of a cylinder relay valves in a correct sequence for engine starting?
Starting Air Distributor
62
What type of pump is used in the steering gear of modern ship?
Vane
63
Which of these bearings listed below is preferred by makers for use in the engine room supply blowers?
Ball
64
Main engine lube oil sump tank is located?
at the bottom of the engine
65
What is the function of double-volute casing of a centrifugal pump?
reduce radial thrust to the impeller
66
What is mainly the reason why fuel injectors used in heavy fuel oil systems are provided with cooling?
To reduce carbon accumulation on the nozzles
67
When chemical energy of the fuel is converted to thermal energy during boiler operation, the conversion process occurs where ?
furnace
68
When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labrynith packing to _______.
seal the casing during periods of low casing pressure
69
A pounding noise in a steam cylinder in a mooring winch could be caused by?
excessive bearing clearance
70
Having high exhaust temperature would affect the?
efficiency of the engine
71
Which of the following is the possible cause of fluctuating steam pressure of atomizing steam system is ?
malfunctioning of steam traps in the atomizing steam
72
Increasing the valve clearance of a diesel engine intake valve will cause the valve to open?
later and have greater lift
73
Refrigerant is circulated through a refrigeration systemb y the _______.
compressor
74
A badly leaking refrigeration compressor discharge valves will cause?
constant running of the compressor
75
A diesel engine fails to start due to excessive water in the fuel. Before the engine can be started, the water should be removed from which of the following?
fuel lines
76
What will be the result if carbon deposits accomulates in the burner throat and diffuser rings of boiler?
decrease boiler efficiency
77
If it becomes necessary to clean the spray holes of a fuel injector in a diesel engine which of the following is to be used?
carbon solvent
78
If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably ______.
misalignment or worn main bearings
79
The range of values around a set point of a measured variable where "no action"occurs in an automatic flow controller is called:
Deadband
80
The measure of the amount of salt present in water is called?
Salinity Specific Gravity
81
Fuel oil enters the main engine cylinder through?
fuel oil injectors
82
Which significant combustion elements of fuel oil is a major source of air pollution?
Sulfur
83
Machinery driving fuel oil transfer and fuel oil service pumps must be fitted with a remote means of stopping the machinery from?
outside the space concerned
84
What will be the result io proper atomization of fuel in diesel engine combustion chambers?
improve combustion
85
Distortion of the spray pattern of a nozzle or injector maybe indicated by a/an?
cooling water temperature rise
86
An engineer on duty insepcting an unmanned engine room at night should be aware of which of the following precautions?
Switch on the dead man alarm upon entering the control room
87
If the control pressure for an automatic combustion control system is lost during maneuvering,you should _____.
switch to manual control
88
Which one of the following devices use to control the admission of steam to the steam cylinder of a reciprocating pump?
Pilot valves and operating rod
89
When fuel viscosity in the service tank needs to be reduced before the atomizer, what should be done?
increase the heater steam supply
90
Before loosening pump covers how should the pressure be checked?
air vent valve open and clear
91
In a diesel engine, the fuel consumption is expressed in?
grams per horsepower per hour
92
In air conditioning system, which part of the system where the refrigerant begins to boil and flash into gas?
Evaporator
93
Which of the following cases listed below should soot blowing be applied to avoid soot fires?
Prior to an increase in power
94
Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling temperature from an individual cylinder begins to rise what should you suspect?
That there is an overloading of cylinder
95
While making engine room sounds at sea, you observe excessive steam leaking from the forward gland on the high pressure turbine .This may indicate that the ______.
gland seal leakoff line is obstructed
96
If condensate is accumulated in the steam side of a fuel oil heater, it could result in?
corrosion
97
What part of a refrigeration system reduces the pressure of a liquid refrigerant?
Expansion valve
98
What part of an engine transmits the reciprocating motion of the piston to the driven unit in the form of rotary motion?
crankshaft
99
The boiler water having a pH reading of 7.0 is said to be ?
neutral
100
What cause carbon deposits on the boiler burner throat ring?
A dirty atomizer sprayer plate