Quiz #4: Q. 101-125

Question 1

high steam pressure

Answer 1

with a leaking crankcase inspection cover gasket

Question 2

If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase __________.

Answer 2

inspection covers should not be opened until the engine has cooled

Question 3

Which of the following methods is normally used to lubricate bearings in a small high- speed diesel engine?
A	Splash lubrication
B	Pressure lubrication
C	Sight feed lubricators
D	Mechanical lubricators

Answer 3

B Pressure lubrication

Question 4

Lube oil pumps taking suction from the sump of most small marine engines are usually __________.

Answer 4

positive displacement type

Question 5

In an auxiliary diesel engine “by-pass type” lubricating oil system, the main lube oil pump forces __________.

Answer 5

some of the oil used by the engine through a filter

Question 6

Lubrication for the main reduction gears used with diesel engines is usually supplied by __________.

Answer 6

an independent lube oil system

Question 7

Which of the routine maintenance procedures listed is required for starting air receivers?

Answer 7

Frequent draining of accumulated moisture.

Question 8

Starting air check valves are held firmly on their seats by __________.

Answer 8

spring force

Question 9

A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine __________.

Answer 9

operates without energy absorbing intake and exhaust strokes

Question 10

Where is the air charge for an air starting system stored?

Answer 10

Pressurized tank

Question 11

An accumulator used in a hydraulic starting system is generally located between the __________.

Answer 11

pump and the starting motor

Question 12

For a diesel engine, approximately how long can an electric starter motor be operated continuously before damage may begin to occur due to overheating?

Answer 12

Not more than 30 seconds

Question 13

Auxiliary diesel engine electric starting motors use __________.

Answer 13

battery power direct current

Question 14

Diesel engine electric starting motors generally require heavier duty motors and operate at higher voltages than comparable starting motors for gasoline engines due to __________.

Answer 14

higher compression pressures

Question 15

Air motors used for starting some auxiliary diesel engines are generally the type known as a/an __________.

Answer 15

vane motors

Question 16

Hydraulic starters are installed on many lifeboat diesel engines instead of comparable air start systems, because __________.

Answer 16

the system can be manually recharged

Question 17

When an engine fitted with a hydraulic starting system starts up, the starter is protected from the higher speed of the engine by __________.

Answer 17

the overrunning clutch

Question 18

The purpose of the engine-driven hydraulic pump in an auxiliary diesel engine hydraulic starting system is to __________.

Answer 18

restore hydraulic pressure in the accumulator after starting

Question 19

A Bendix drive starting motor disengages the drive gear from the flywheel by __________.

Answer 19

having the flywheel impart a torque to the starter pinion

Question 20

The pinion of an auxiliary diesel electric starting motor normally engages the flywheel ring gear by means of a/an __________.

Answer 20

Bendix drive or similar mechanism

Question 21

Auxiliary diesel engine electric starting motors use __________.

Answer 21

battery power direct current

Question 22

Starting systems for large, direct reversing, main propulsion diesel engines are usually __________.

Answer 22

direct air admissions

Question 23

During the starting of a diesel engine, compression gases are prevented from backing into the air starting system, shown in the illustration, by the __________. MO-0046

Answer 23

cylinder air starting check valves

Question 24

When an air started, four-stroke/cycle diesel engine is being cranked over; the starting air is admitted to each cylinder during the beginning of its __________.

Answer 24

power stroke

Question 25

In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without air starting valves fire first because the __________.

Answer 25

cylinders are not chilled by the expansion of the starting air