Deck 6: Cooling Systems and Nozzles in Engineering

Question 1

What are used in the direct flow system to transverse the pond before uniting at intake?

A)separators
B)filters
C)baffle walls
D)porous pipes

Answer 1

baffle walls

Question 2

What type of cooling system is used in the large power plants?

A)cooling ponds
B)natural flow system
C)cooling towers
D)single deck system

Answer 2

cooling towers

Question 3

How does outside air enter into the wet cooling system?

A)air vents
B)louvers
C)tuyeres
D)vacuum

Answer 3

louvers

Question 4

Why is exhaust steam coming out of turbine is admitted to a steam header?

A)to increase the pressure
B)to decrease the velocity
C)to decrease the pressure drop
D)to control the pollution

Question 5

In which system is Cooling of hot water is done on tray as step by?

A)mechanical draught cooling system
B)hyperbolic cooling tower
C)atmospheric cooling tower
D)wet cooling tower

Question 6

How is air produced in mechanical draught cooling tower?

A)air tuyeres
B)propeller fans
C)air blowers
D)louvre

Question 7

Why is induced draught considered better than the forced draught?

A)because power requirement is high for forced draught
B)maintenance of induced draught fan is costlier
C)forced draught is less efficient
D)forced draught produces less amount of speed of air

Question 8

Nozzles are used to control the ___________

A)temperature
B)rate of flow
C)mass flow rate
D)none of the mentioned

Question 9

A nozzle used to send fluid in coherent stream is called as ________

A)jet
B)high velocity nozzle
C)every nozzle sends fluid in coherent stream
D)none of the mentioned

Question 10

In fountains the type of nozzle used is _______

A)none of the mentioned
B)turbulent jet
C)high speed nozzle
D)laminar jet

Question 11

Nozzles used in blast furnaces are called as _______

A)jet
B)hot blast
C)tuyeres
D)none of the mentioned

Question 12

If mach number is less than one then its flow is ______________

A)subsonic flow
B)turbulent flow
C)laminar flow
D)none of the mentioned

Question 13

Nozzle used in rocket engine is __________

A)convergent nozzle
B)divergent nozzle
C)convergent - divergent nozzle
D)none of the mentioned

Question 14

In rocket engine the flow in the throat of the nozzle is __________

A)subsonic
B)laminar
C)turbulent
D)none of the mentioned

Question 15

When mach number is greater than one the flow is ________

A)subsonic
B)supersonic
C)laminar
D)none of the mentioned

Question 16

In rocket engines the amount of expansion in Nozzle determines the __________

A)exit temperature
B)exit pressure
C)exit temperature & pressure
D)none of the mentioned

Question 17

Pressure ratios below 20 are used in _____________ engines.

A)steam turbine
B)aero derivative engines
C)heavy frame engines
D)none of the mentioned

Question 18

Aeroderivative engines have pressure ratios ___________

A)greater than 30
B)lesser than 30 and greater than 20
C)greater than 50
D)none of the mentioned

Question 19

Aeroderivative engines are used where ____________ power units are required.

A)larger
B)smaller
C)optimum
D)none of the mentioned

Question 20

Gas turbines operate at pressures ________ than critical pressure ratio.

A)higher
B)lesser
C)does not depend on pressure ratio
D)none of the mentioned

Question 21

Critical pressure ratio is ratios of pressures at _________ discharge.

A)minimum
B)none of the mentioned
C)optimum
D)maximum

Question 22

Coefficient of velocity of nozzle is _______________

A)theoretical velocity/actual velocity
B)actual velocity/theoretical velocity
C)it is an experimental value
D)none of the mentioned

Question 23

Coefficient of discharge of Nozzle is _______

A)cd = cc/cv
B)cd = cc*cv
C)cd = cv/cc
D)none of the mentioned

Question 24

Coefficient of contraction is the__________

A)ratio of actual cross sectional area to geometric cross sectional area
B)ratio of geometric cross sectional area to actual cross sectional area
C)ratio of pressure exerted to cross sectional area
D)none of the mentioned

Question 25

Pressure loss occurs in nozzle due to __________

A)due to viscous force
B)when fluid flows from convergent to divergent
C)frictional forces
D)none of the mentioned