Quiz #6: Q. 151-175

Question 1

Control of the fuel oil metering valve in an automatically fired auxiliary boiler is accomplished by a __________.

Answer 1

steam pressure sensing device with linkage to the damper air vanes

Question 2

If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be __________.

Answer 2

excessive wear of the cooling water pump

Question 3

If the raw water supply pressure for a diesel engine cooling system is below normal, you should check for a __________.

Answer 3

clogged sea strainer

Question 4

Antifreeze solutions containing ethylene glycol, should not be mixed with corrosion protection oils, as the resultant mixture __________.

Answer 4

may cause frothing

Question 5

In a closed cooling water system, which of the following problems can cause the water pressure to fluctuate?
A An open vent in the cooling system.
B A restricted water passage in the engine.
C A fouled sea chest.
D Air entrained in the cooling water.

Answer 5

D Air entrained in the cooling water.

Question 6

How is the illustrated strainer element cleaned during engine operation? Illustration MO-0057

Answer 6

The T-handle is rotated

Question 7

In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the __________.

Answer 7

combustion by-products removed from the cylinder walls

Question 8

A dirty diesel engine oil filter element can best be detected by __________.

Answer 8

the pressure drop across the filter

Question 9

The color of the diesel engine detergent type lube oil in an operating diesel engine is black, this indicates __________.

Answer 9

normal oil condition

Question 10

A dirty lube oil strainer can result in \_\_\_\_\_\_\_\_\_\_.
A	crankcase dilution
B	low lube oil temperature
C	low bearing oil pressure
D	excessive oil consumption

Answer 10

C low bearing oil pressure

Question 11

When a leak has developed in the lube oil cooler of an operating diesel engine, which of the listed operating conditions can be expected to occur?
A Lube oil level decreases
B Lube oil level increases
C Lube oil contaminated with fresh water coolant
D Lube oil contaminated with saltwater

Answer 11

A Lube oil level decreases

Question 12

Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil __________.

Answer 12

temperature

Question 13

On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter cartridge indicates __________.

Answer 13

piston ring blow-by

Question 14

In an operating diesel engine, pre-ignition can be caused by __________.

Answer 14

oil in the air charge

Question 15

Irregular engine speed in a diesel generator can be caused by __________.

Answer 15

binding in the fuel control linkage

Question 16

If fuel oil were being discharged from the waste water outlet of a fuel oil disk type centrifuge, operated as a separator, you should __________.

Answer 16

re-prime the purifier with sealing water

Question 17

A modern centrifuge, similar to the device shown in the illustration, is opened for periodic cleaning. The most common cause of operating failure after reassembling, is due to __________. MO-0012

Answer 17

not replacing the bowl O-rings that have taken a permanent set

Question 18

Heat damage to fuel injection nozzles can be prevented by avoiding __________.

Answer 18

long periods of engine overload

Question 19

One cause of diesel engine surging can be a result of __________.
A injection pump fuel rack binding or sticking
B low compression
C solenoid stuck open
D fuel booster pump pressure too high

Answer 19

A injection pump fuel rack binding or sticking

Question 20

Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?

Answer 20

Corrosion and eventual failure of the tank.

Question 21

On a diesel engine with direct-cylinder admission air starting, a leaking air starting valve would be indicated by __________.

Answer 21

an overheated starting air supply pipe

Question 22

Which of the following conditions is most likely to occur if the electric starter motor pinion gear fails to disengage from the flywheel of a diesel engine after the engine has started?
A Engine will stop
B Starting motor will dangerously over-speed
C Flywheel will be damaged
D Combustion gases will enter the air starting system

Answer 22

B Starting motor will dangerously over-speed

Question 23

When starting air is admitted, a diesel engine turns over very slowly without firing. The cause may be __________.

Answer 23

low starting air pressure

Question 24

When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, you can expect __________.

Answer 24

overheating because of slipping shoes

Question 25

Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or __________.

Answer 25

feeler gauge