C9
1A fixed displacement pump is a hydraulic pump in which the________.
Discharge pressure is constant
Discharge capacity is changing
Discharge capacity is dependent on the consumption
Discharge capacity is constant
2 The following are parts of the main bowl of purifier except___________.
Hood
Nut
Bolt
Body
3 In hydraulic system, all machines which are consumers of hydraulic power equipped with ________.
Pump
Relief valve
Motor
Tank
4Which of the following statements concerning braze welding is/are correct?
Braze welding is an exceptionally good method of repairing malleable (special heattreated) iron.
A braze welded joint should be cooled immediately with cold water or forced air draft to reduce the intensity of the heat path.
Repairs to working parts or containers used in chemical processes, especially strong alkaline solutions, are effectively accomplished with braze welding.
All of the above.
5Which of the following statements concerning braze welding is/are correct?
A braze welded joint should be cooled immediately with cold water to obtain the highest strength.
Repairs to containers used in chemical processes, especially strong alkaline solutions, are effectively accomplished with braze welding.
Braze welding is an acceptable method of repairing malleable iron and mild steel.
All of the above.
6 If the intercooler relief valve lifts while an air compressor is operating under load, you should check for _____.
A defective pressure switch or pilot valve
A leak in the intercooler piping
Leakage through the low pressure unloaded control diaphragm
Leaking high pressure discharge valves
7Acetylene should never be used at pressures in excess of 15 psig because the _____.
Acetylene cylinders have a maximum allowable pressure of 15 pisg
Slightest shock could cause an explosion
Fusible plug will blow out
Relief valve will lift
8 The tool used to makeup connection fittings for small diameter copper tubing is called a/an _____.
Adjustable tube roller
Adjustable belling tool
Flaring tool
Tubing expander
9 If a small auxiliary diesel engine will not crank but can be barred over, the trouble may be due to _________.
Air bound fuel injectors
A leaky fuel pump relief valve
A defective engine governor
Corrosion of starting battery terminal connections
10 You should never watch the arc generated during electric arc welder with the naked eye because _____.
Serious flash burns will result
Arc blow will burn our face
The fumes are highly toxic
Slag and metal splatter will get in your eyes
11When a waste heat boiler is installed in the exhaust gas bypass would be used _____.
At high loads to prevent overheating
During periods of high steam demand
When the turbocharger is in operation
At low loads to prevent corrosion in the boiler
12An exhaust gas bypass is installed on a waste heat boiler in order to ______.
Bypass exhaust gas at high loads to prevent excessive back pressure
Bypass a portion of the exhaust gas at peak loads for better efficiency
Recycle exhaust gas to the turbocharger
Minimize moisture condensation in the boiler gas passages at low loads
13Which of the following problems would be the probable cause for the faulty operation of a
Reciprocating air compressor suction valve?
Faulty operation of a cylinder unloader
Carbon build up in the piston ring belt
Compressor operation in an area of high relative humidity
Lifting of intercooler relief valve
14 If the drive belts on an air compressor were squealing during start up, you should _____.
Check the air filter
Check for a receiver outlet valve which may be partially closed
Check the operation of the unloaders
Check for a defective high‐pressure cut‐out switch
15 Thermocouple pyrometers are sued on large, main propulsion diesel engines to indicate the temperature of the ______.
Cooling water leaving each cylinder
Fuel oil entering the injector
Exhaust gases at various locations
Lube oil at the bearing supplies
16 Flux is used when soldering, in order to _____.
Decrease the melting point of the solder
Ensure proper tinning
Control the soldering iron temperature
Decrease the surface tension of the solder
17A dirty intercooler inn the ship service air compressor will result in _____.
Decreased compression ratio
Higher than normal power consumption
Unloader malfunction
Water in the lubricating oil
18 Protective equipment to be used while carrying out oxy‐acetylene welding should always include _____.
Ear plugs
Non‐sparking tools
Steel toe safety shoes
Tinted goggles
19 Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an _________.
Definer or viscous fluid damper
Engine support vibration isolator
Lightened crankshaft flywheel
Spherically seated crankshaft bearing
20 The leaking valves in a low pressure, reciprocating, air compressor can result from _____.
Abrasion by dust and dirt
Excessive compressor discharge pressure
Operating the compressor at excessive speed
21 Black smoke exhausting from a diesel engine may be caused by ______.
Excessive scavenging air pressure
High coolant temperature
Insufficient fuel
A clogged air cleaner
22 Cylinder inlet valve failure in a low pressure air compressor can be caused by _____.
Mechanical failure in the unloader
Flywheel misalignment with the driving motor
Insufficient rocker arm clearance
Excessive moisture build‐up in the receiver
23White smoke exhausting from a diesel engine can be caused by a _______.
High combustion temperature
High compression pressure
Fuel with a high vanadium content
Cracked cylinder liner
24 Combustion knock occurring in a diesel engine can be caused by ______.
Insufficient fuel
Low coolant temperature
High ambient temperature
Carbon buildup on the nozzle holder
25 If a diesel engine is smoking excessively under load, the cause could be ________.
Plugged injector holes
Low exhaust back pressure
Early fuel injection in one of the cylinders
Compression pressure in one of the cylinders
26Which of the following statements is correct concerning welding sequences?
First, weld the joints that will tend to contract the most.
First, weld attachments which will restrain the points of maximum contraction.
Make a weld across an unwelded plate joint in adjoining members.
Each successive welded part should be restrained to lock in stresses and avoid cracking.
27 In certain circumstances, weldments are preheated before each pass to _____.
Increase the temperature gradients in the weld areas
Allow the user the use of smaller welding rods
Eliminate the need for post heating
Reduce internal stresses
28 Excessive lube oil consumption by a reciprocating air compressor can be caused by _____.
Increasing the operating pressure differential
Carrying the oil level higher than normal
Using oil having an excessive viscosity
Intercooler or aftercooler leaks
29When welding or burning with an oxy‐acetylene torch, _____.
Never allow more than 15 PSIG pressure in the acetylene hose
It is important to remember that the oxygen cylinder and hose thread connections are left handed
Never allow more than 10 PSIG pressure in the oxygen hose
It is important to remember that the acetylene hose thread connections are right handed
30 If an electric motor driven air compressor fails to start, it may be due to a _____.
Leaking discharge valve
Jammed suction valve
Broken discharge unloader
Tripped overload relay
31 The loss of a diesel engine cylinder air charge through leaky valves, pistons rings, worn or scored liners, would be indicated by which of the following sets of exhaust of conditions?
Low compression pressure and high exhaust temperature
Low firing pressure and high mean effective pressure
Low compression pressure and low exhaust temperature
Low firing pressure and low exhaust temperature
32 4/3 Way valve is a type of directional valve with ___________ .
4 ports and 3 positions
4 positions and 3 ports
4 positions and 3 method of operation
2 ports and 3 positions
33A welding procedure used for joining dissimilar metals used in the construction of a MODU would be recorded in the
ASTM specifications
Construction portfolio
Welding plan
Coast Guard file
34Which of the following will speed up the recovery process when performing maintenance on a refrigeration system _______?
Chilling the recovery vessel only
Heating the appliance only
Close the cooling water valve of condenser
Chilling the recovery vessel and heating the appliance
35An aligning punch is used to_______________.
Line up corresponding holes in adjacent parts
Completely loosen a jammed bolt
Mark centers and lines in layout work
Make a starting mark for a drill
36What factors shorten the life of valve springs?
Corrosion and fatigue
Compression and corrosion
Misalignment and compression
Fatigue and compression
37Which of the fittings listed should be used for the installation of piping to permit removal of the pump for servicing?
Union
Coupling
Quick disconnect
Nipple
38 Expansion valve maintenance should include which of the following procedures?
Ensuring that the thermal bulb is in good contact with the suction line.
Lapping the seat
Clean the seat with abrasive
Heat up the expansion valve
39A dial indicator is used to measure________.
Positive readings only
Scribed layout lines on vertical surfaces
Torque of a shaft
Shaft eccentricity
40 Important check to be done during overhauling of the pump is the______.
Pump shaft condition
Mechanical seal condition
Impeller condition
Wear ring clearance against impeller
41An oil film of a lubricant is affected by the______.
Thinner grade of oil
Excessive "drag" of the moving parts of the engine
Thicker grade of oil
Working temperature of the engine
42 Engine operating conditions may be indicated by the color of the exhaust smoke. Black smoke could indicate ________.
An insufficient speed droop setting
Clogged drain holes in the oil control rings
Complete combustion
An overloaded engine
43A reciprocating air compressor is running roughly and vibrating excessively, indicating that the _____.
Compressor is overloaded
Motor is overloaded
Belts are too tight
Foundation bolts are loose
44When arc welding, the flux that covers the electrode is used to _____.
Reduce oxidation
Control penetration
Reduce metal fatigue and warpage
Increase heat transfer
45 In order to minimize distortion in a weldment due to shrinkage, you should _____. I. use intermittent welds rather than continuous welds wherever possible II. Make fewer passes with large electrodes as opposed to many passes with small electrodes III. use
I only
I & II
I, II & III
II & III
46A flare‐type tubing connector is used in the hydraulic hatch‐cover system and has developed a slight leak. To stop the leak you should __________.
Keep the system in operation and tighten the flare nut
Replace both the tubing sections and the fitting
Stop the system and use only one wrench to tighten the flare nut
Shut down the power unit and use two wrenches to avoid damaging the tubing when tightening
47 If the electric motor driving an air compressor fails to start, the cause may be a _____.
Leaking unloader
Tripped circuit breaker
Control line leak
Defective pop valve
48 The nut of the bowl assembly is confirmed tight___________.
By a torque wrench
When the nut is no longer move after several hammer blows
By hand only
When marks on the body and nut are aligned
49 The size of flexible hose used in a hydraulic system is indicated by______________.
A color code on the armor
The thickness of the tube wall
The inside diameter of the tube
The numerical designation found on the 'skin' of the hose
50Good maintenance is decisive and best be achieved in the engine room if there is________________.
All engine personnel are present
Natural routine work
Maintenance work
High degree of safety
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