Quiz #3: Q. 76-100

Question 1

Fuel injection pumps using the port and helix metering principle requires the use of a __________.

Answer 1

lapped plunger and barrel

Question 2

Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and an individual pump for each cylinder?
A	Common-rail injection
B	Air injection
C	Jerk pump injection
D	Distributor injection

Answer 2

C Jerk pump injection

Question 3

The amount of fuel delivered by a helical plunger fuel injection pump is controlled by __________.

Answer 3

rotation of the pump plunger

Question 4

Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?
A	Sludge
B	Gasoline
C	Fuel oil
D	Lube oil

Answer 4

A Sludge

Question 5

Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a __________.

Answer 5

high temperature and a low viscosity

Question 6

Valve ‘1’, as shown in Illustration MO-0077, should be operated when __________.

Answer 6

entering or departing port.

Question 7

To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of __________.

Answer 7

monel metal or stainless steel

Question 8

For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because __________.

Answer 8

changing filter elements would not interrupt engine operation

Question 9

Cooling the intake air supplied to a diesel engine will __________.

Answer 9

increase peak power output

Question 10

A large, low-speed, main propulsion diesel engine uses sea water to directly cool the __________.

Answer 10

scavenging air

Question 11

An increase in the air inlet manifold pressure of a diesel engine will result in a/an __________.

Answer 11

decrease in fuel consumption per horsepower-hour

Question 12

What is the function of the after coolers installed in the diesel engine air intake system?

Answer 12

Increase the air density

Question 13

In a naturally aspirated diesel engine, the volume of air intake is directly associated with engine __________.

Answer 13

displacement

Question 14

The section of the turbocharger in Illustration MO-0080 which would be connected to the after cooler inlet is labeled __________.

Answer 14

B

Question 15

Compared to a naturally aspirated diesel engine, a supercharged diesel engine has __________.

Answer 15

a cylinder air charge of higher pressure

Question 16

A naturally aspirated diesel engine at full throttle will have an intake manifold pressure __________.

Answer 16

slightly less than atmospheric pressure

Question 17

Lube oil cannot be efficiently filtered if its __________.

Answer 17

temperature is too low

Question 18

A magnetic strainer is primarily used in diesel engine reduction gear oil systems to remove small particles of __________.

Answer 18

ferrous materials

Question 19

Where would a coarse screen wire-mesh strainer normally be found on a diesel engine lubrication system?

Answer 19

pump suction line

Question 20

The lube oil strainer shown in the illustration is used on the reduction gear of a mid-size diesel engine. The strainer elements consist of __________. MO-0057

Answer 20

metal disks

Question 21

Which of the following statements is true concerning a main diesel engine oil cooler?
A The oil pressure is greater than the cooling water pressure.
B The oil flow control valve is always installed in the oil input line.
C The oil temperature is less than the cooling water temperature.
D The oil pressure is less than the cooling water pressure.

Answer 21

A The oil pressure is greater than the cooling water pressure.

Question 22

The lube oil cooler is located after the lube oil filter in order for __________.

Answer 22

the filter to operate more efficiently

Question 23

Heat exchangers are most commonly found in a small auxiliary diesel engine __________.

Answer 23

lube oil system

Question 24

The purpose of an oil mist detector in a main propulsion diesel engine is to warn of __________.

Answer 24

a possible overheated bearing

Question 25

Which of the following problems could develop due to the accumulation of oil vapors in the crankcase of a diesel engine?
A	Crankcase explosion
B	Poor fuel economy
C	Reduced lubrication
D	Combustion knock

Answer 25

A Crankcase explosion