Deck 9: Boiler Technology and Operation: Salts, Features, Difficulties, and Draught Systems

Question 1

Why are salts deposited on the evaporator drum?

A)due to continuous circulation of water
B)due to usage of hard water containing calcium content
C)due to circulation of impure water
D)due to the chemicals added in water

Answer 1

due to circulation of impure water

Question 2

What is feature of the Loffler boilers?

A)evaporating water by super heated steam
B)provide better efficiency by re-circulating gas coming out of turbine
C)produce better steam quality by heating the boiler furnace above critical degrees
D)eliminate the extra components used

Answer 2

evaporating water by super heated steam

Question 3

What is the major difficulty of the La-Mont boiler?

A)unstable water circulation
B)deposition of salts
C)overheating of the components
D)boiler working is slow

Answer 3

deposition of salts

Question 4

Which is the most recent economical method of power generation from boilers?

A)natural circulation boiler
B)fire tube boiler
C)forced circulation
D)super critical boiler

Question 5

Which of the following boilers has the highest heat transfer capacity?

A)subcritical boiler
B)critical boiler
C)forced circulation boiler
D)supercritical boiler

Question 6

Why boiler draught is most essential part of the thermal plants?

A)serves combustion by supplying ample amount of air
B)helps in maintaining air ventilation
C)required to maintain constant air flow
D)stabilizes the boiler system

Question 7

Which is the correct formula of total draught loss?

A)ht = hv + hb + hc + hcd
B)ht = hv + hb - hc + hcd
C)ht = hv - hb + hc + hcd
D)ht = hv - hb - hc - hcd

Question 8

By what is natural draught produced?

A)air duct
B)chimney
C)locomotive exhaust
D)air blower

Question 9

Which of the following given below as the affect on amount natural draught?

A)boiler operation
B)size of the furnace
C)grade of the fuel
D)dust content in the fuel is used

Question 10

When is artificial draught preferred?

A)when quick evacuation of flue gases is required
B)when we choose large power plant systems
C)when draught produced by chimney is not sufficient
D)when there are many components inside the boiler

Question 11

Artificial draught is also called as _______

A)force draught
B)induced draught
C)balanced draught
D)mechanical draught

Question 12

What is installed to transfer air into furnace in forced draught system?

A)air blower
B)tuyeres
C)draft gauges
D)cyclone separator

Question 13

Where is blower installed in induced draught system?

A)near the boiler
B)base of the chimney
C)above the boiler
D)between economizer and air preheater

Question 14

How can exhaust gas be recovered in the induced draught?

A)by installing the forced draught fan at the starting point
B)by extending the chimney's height
C)by inletting high amount of air from multiple air ducts
D)by installing air preheater and economizer along the gas path

Question 15

Which is most preferred type of draught system?

A)chimney draught
B)fan draught
C)force draught
D)balanced draught

Question 16

Which type of draught system is used in the locomotives?

A)natural draught system
B)balanced draught system
C)forced draught system
D)induced steam draught system

Question 17

Which draught system is also known as turbine draught?

A)forced steam draught
B)induced steam draught
C)natural draught
D)fan draught

Question 18

Which draught system is used as conjunction with chimney draught?

A)forced steam draught
B)forced draught
C)induced draught
D)balanced draught

Question 19

There are two types of water feeding in a boiler, they are ________ and _________

A)open feed system and closed feed system
B)condensed and raw
C)feed-water and clean water
D)hot and cold water

Question 20

In a fire tube boiler, the water to be heated is kept in the ________

A)tubes of the setup
B)shell of the setup with hot gas in tubes
C)tank with a fire chamber that conducts heat by steel rods
D)tank and heated by fire below it

Question 21

Which of the following statement is wrong?

A)water tube boilers are internally fired
B)locomotive boiler is a water tube boiler
C)la-mont boiler is a low pressure water tube boiler
D)all of the mentioned

Question 22

An air preheater is installed ___________

A)between the economiser and chimney
B)before the superheater
C)before the economiser
D)none of the mentioned

Question 23

What is the length of shell of a Locomotive boiler?

A)2m
B)3m
C)4m
D)6m

Question 24

What is the function of a flywheel?

A)to convert reciprocating motion of the piston into rotary motion
B)to prevent fluctuation of speed
C)to keep the engine speed uniform at all load conditions
D)to convert rotary motion of the crankshaft into to and fro motion of the valve rod

Question 25

The shell diameter of a Locomotive boiler is?

A)1.5m
B)1m
C)2m
D)2.5m