Deck 4: Turbines, Heat Exchangers, and Refrigeration Cycles

Question 1

Impulse blades are in the shape of

A)rain drop
B)circular
C)half moon
D)none of the mentioned

Answer 1

half moon

Question 2

Astern turbines are used in______________

A)power generation
B)marine purposes
C)aircraft
D)none of the mentioned

Answer 2

marine purposes

Question 3

Cross compound steam turbines are once used in______________        

A)generation of electricity
B)marine ships
C)automobiles
D)none of the mentioned

Answer 3

marine ships

Question 4

When steam reaches turbine blades the type of force responsible for moving turbine blades are______________        

A)axial force
B)shear force
C)longitudinal force
D)none of the mentioned

Question 5

Multi stage arrangement of turbines is called as______________  

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

Question 6

Compounding efficiency at low speed.

A)decrease
B)increase
C)maximizes
D)none of the mentioned

Question 7

In velocity compounded turbines flow passage is from______________      

A)moving blades to fixed nozzles
B)fixed nozzles to moving blades
C)fixed blades to moving nozzles
D)none of the mentioned

Question 8

A velocity compounded impulse turbine is also called as______________  

A)curtis wheel
B)pressure compounded
C)curtis wheel & pressure compounded
D)none of the mentioned

Question 9

Reaction turbine is also called as

A)impulse turbine
B)curtis wheel
C)parsons turbine
D)none of the mentioned

Question 10

A turbine comprising of fixed blades and moving nozzles is called as reaction turbines.

Question 11

Which of these is not an application of back pressure turbine?

A)desalination of sea water
B)filtration of water
C)process industries
D)petrochemical installations

Question 12

Pass-out turbines are used in which of these cases?

A)relatively high back pressure
B)small heating requirement
C)only relatively low back pressure
D)both relatively high back pressure and small heating requirement

Question 13

Heat exchangers are classified into how many categories?

A)1
B)2
C)3
D)4

Question 14

Based upon the nature of heat exchange process, the heat exchangers are classified into how many categories

A)1
B)2
C)3
D)4

Question 15

Which type of flow arrangement is this?

A)counter flow
B)parallel flow
C)regenerator
D)shell and tube

Question 16

Which of the following is not an example of recuperators type heat exchanger?

A)automobile radiators
B)condensers
C)chemical factories
D)oil heaters for an aero plane

Question 17

In how many categories heat exchangers are classified on the basis of direction of flow of fluids?

A)4 categories
B)3 categories
C)2 categories
D)1 categories

Question 18

In how many categories heat exchangers are classified on the basis of physical state of heat exchanging fluids?

A)1
B)2
C)3
D)4

Question 19

Which of the following operations occur in a vapour refrigeration cycle?

A)compression
B)cooling and condensing
C)expansion and evaporation
D)all of the mentioned

Question 20

Compression can be

A)dry compression
B)wet compression
C)both of the mentioned
D)none of the mentioned

Question 21

Wet compression is preferred over dry compression.

Question 22

Why is wet compression not preferred?

A)the liquid refrigerant can be trapped in the head of cylinder
B)this may damage the valves or cylinder head
C)liquid refrigerant can wash away the lubricating oil thus accelerating wear
D)all of the mentioned

Question 23

The expansion process is

A)isentropic
B)reversible
C)adiabatic
D)all of the mentioned

Question 24

The evaporation process is a

A)constant volume reversible process
B)constant pressure reversible process
C)adiabatic throttling process
D)reversible adiabatic process

Question 25

The evaporator produces the cooling or refrigerating effect.