Deck 15: Boiler Systems and Fluid Dynamics

Question 1

The exit velocity in the nozzle increases as per______________  

A)stagnation point
B)continuity equation
C)prandtl number
D)newton's law

Answer 1

continuity equation

Question 2

Compressible flow is a flow that deals with

A)fluid temperature
B)fluid pressure
C)fluid density
D)fluid geometry

Answer 2

fluid density

Question 3

The coefficient of kinetic friction is less than the coefficient of static friction.

Answer 3

True

Question 4

A cubical block rests on an inclined plane of ? = 1/?3, determine the angle of inclination when the block just slides down the inclined plane?

A)40°
B)50°
C)30°
D)20°

Question 5

When a gas is pushed through a pipe, the gaseous molecules are______________by the pipe's walls

A)attracted
B)absorbed
C)deflected
D)dissipated

Question 6

Gas flows through the nozzle from an area of______________pressure (called the chamber) to one of______________pressure

A)high, low
B)low, high
C)same, same
D)constant, infinite

Question 7

On what basis are fire and water tube boilers are classified?

A)depending the combustion products formed
B)depending the state of fuel
C)depending on the steam formation rate
D)depending tubular heating surface

Question 8

Stirling boiler is an example of which type of boiler?

A)inclined tube boilers
B)mobile boiler
C)fire tube boiler
D)water tube boiler

Question 9

Which of these is a stationary boiler?

A)locomotive boiler
B)marine boiler
C)mobile boiler
D)babcock-wilcox boiler

Question 10

Which of these is a mobile boiler?

A)lancashire boiler
B)stirling boiler
C)locomotive boiler
D)cochran boiler

Question 11

Are boilers defined on the basis of heat source.

Question 12

What is the steam pressure limit of natural circulation boilers?

A)650bar
B)180bar
C)400bar
D)550bar

Question 13

Which of the given boilers operate above critical pressure?

A)natural circulation boilers
B)forced circulation boilers
C)once-through boilers
D)water tube boilers

Question 14

Which type of boilers are called drum-less boilers?

A)natural circulation boilers
B)fire tube boilers
C)positive forced circulation boiler
D)forced circulation boiler

Question 15

Chances of sediments depositing inside the water tubes in the shell is less due to?

A)low working pressure
B)natural circulation of water
C)partial circulation of water
D)high working pressure

Question 16

Out of the given option choose the advantage that supports fire tube boilers?

A)water circulation is cyclic
B)used as a mobile boiler
C)water circulation is limited inside boiler shell
D)bursting of flue tube does not cause any explosion

Question 17

Tubular air preheater of a boiler is also called as______________

A)recuperative air preheater
B)elliptical air preheater
C)ovoid air preheater
D)squarish air preheater

Question 18

What does regenerative air preheater consists of?

A)rotor
B)skewers
C)propeller
D)piston

Question 19

Which fuel is prepared by moulding finely ground coal under pressure?

A)coke
B)charcoal
C)briquette coal
D)lignite

Question 20

Which fuel has the lightest liquid petroleum fraction?

A)diesel
B)petrol
C)distillate
D)kerosene

Question 21

Which statement about impulse turbine is true?

A)steam expands over blades
B)steam expends completely in stationary nozzels
C)steam expends partially over nozzle and turbine blades
D)steam expends over blades incompletely

Question 22

In velocity compounding the steam is expanded from the boiler pressure to condenser pressure in one set of stationary blades on nozzle.

Question 23

In condensing turbines vacuum is obtained by______________      

A)sudden pressure drop
B)removal of non condensable gases
C)sudden drop in pressure and by removal of non condensable gases
D)none of the mentioned

Question 24

Reaction turbine works with the force obtained from change in pressure energy.

Question 25

A turbine having alternate blades and nozzles is called as______________            

A)impulse turbine
B)reaction turbine
C)impulse & reaction turbine
D)none of the mentioned