Quiz #5: Q. 126-150

Question 1

The most common instrument used to measure diesel engine exhaust pressure is the __________.

Answer 1

manometer

Question 2

In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in __________.

Answer 2

sulfuric acid corrosion

Question 3

One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the __________.

Answer 3

exhaust temperature

Question 4

Exhaust pipes for separate main propulsion diesel engines can be combined only when __________.

Answer 4

they are arranged to prevent gas backflow to each engine

Question 5

The exhaust system for a turbocharged diesel engine functions to __________.

Answer 5

power the turbocharger

Question 6

Auxiliary boilers are divided into several classifications, one of which is __________.

Answer 6

water-tube forced circulation

Question 7

In a coil-type forced circulation auxiliary water-tube boiler, __________.

Answer 7

steam demand response is comparatively rapid

Question 8

Which of the following statements concerning fire-tube boilers is correct?
A Combustion gases flow through the tubes.
B Flames impinge on the tubes.
C Combustion occurs in the tubes.
D Water flows through the tubes.

Answer 8

A Combustion gases flow through the tubes.

Question 9

Bottom blow valves are installed on auxiliary water-tube boilers to __________.

Answer 9

remove settled solids from the water drum

Question 10

The purpose of try-cocks used on an auxiliary boiler is to __________.

Answer 10

provide an alternate means of determining the water level, if the gauge glass fails

Question 11

An exhaust gas bypass is installed on a waste heat boiler in order to __________.

Answer 11

minimize moisture condensation in the boiler gas passages at low loads

Question 12

The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust __________.

Answer 12

gas temperature

Question 13

Casing drains may be required on a waste heat boiler gas passage side to __________.

Answer 13

drain off condensation

Question 14

As shown in the illustration, the function of component “1” is to ________. MO-0128

Answer 14

evaporate circulating boiler water into saturated steam

Question 15

As shown in the illustration, what component would normally be installed at location “D? MO-0128

Answer 15

Oil fired mechanical burner

Question 16

The boiler shown in the illustration would be classed as __________. MO-0064

Answer 16

single-pass, fire-tube, scotch marine

Question 17

The tube sheets installed in a fire-tube auxiliary boiler are normally connected by __________.

Answer 17

fire-tubes and stay-tubes

Question 18

Fusible plugs are installed in fire-tube boilers to __________.

Answer 18

warn the engineer of low water level

Question 19

Constant capacity, pressure atomizing, fuel burners designed to meet a wide variation in steaming loads on an auxiliary boiler, are __________.

Answer 19

cycled on and off in response to steam demand

Question 20

The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent __________.

Answer 20

explosions in the boiler furnace

Question 21

A photoelectric cell installed in an automatically fired auxiliary boiler burner management system __________.

Answer 21

opens the burner circuit upon sensing a flame failure

Question 22

The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and __________.

Answer 22

automatically regulates the quantity of oil and air flow to the burner

Question 23

A variable capacity, pressure atomizing, fuel oil burner functions to __________.

Answer 23

provide a wide range of combustion

Question 24

The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler, are automatically closed by __________.

Answer 24

high steam pressure