Deck 1: Nozzles, Fountains, and Compressible Flow

Question 1

Nozzle is used to control direction or characteristics of flow.

Answer 1

True

Question 2

 In fountains the type of nozzle used is

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

Answer 2

laminar jet

Question 3

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

Answer 3

subsonic flow

Question 4

The steam leaves the nozzle at a

A)low pressure and a high velocity
B)high pressure and a high velocity
C)high pressure and a low velocity
D)low pressure and a low velocity

Question 5

When mach number is greater than one the flow is______________      

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

Question 6

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 7

De-Laval turbine is a______________      

A)multi rotor impulse turbine
B)impulse reaction turbine
C)single rotor impulse turbine
D)none of the mentioned

Question 8

The Parsons' reaction turbine has

A)only moving blades
B)only fixed blades
C)fixed and moving blades of different shape
D)identical fixed and moving blades

Question 9

What is the critical pressure ratio for initially wet steam?

A)0.582
B)0.546
C)0.577
D)0.601

Question 10

The ratio of the useful heat drop to the isentropic heat drop is called______________      

A)condenser efficiency
B)nozzle efficiency
C)vacuum efficiency
D)boiler efficiency

Question 11

Rateau turbine is______________      

A)pressure-velocity compounded turbine
B)simple reaction turbine
C)velocity compounded turbine
D)pressure compounded turbine

Question 12

When the cross-section of a nozzle increases continuously from entrance to exit, it is called a______________      

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

Question 13

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 14

Aeroderivative engines are larger.

Question 15

Aeroderivative engines release higher emissions.

Question 16

Critical pressure ratio is ratios of pressures at discharge.

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

Question 17

Ratio of critical pressure to inlet pressure in known as______________    

A)none of the mentioned
B)pressure ratio
C)critical pressure ratio
D)isoentropic pressure ratio

Question 18

In De Laval Nozzle critical pressure ratio is given by (2/y+1)^(y/y-1).

Question 19

With the increase in pressure, the exit velocity______________

A)decreases
B)increases
C)same
D)independent

Question 20

The Prandtl Number approximates

A)momentum diffusivity to thermal diffusivity
B)thermal diffusivity to momentum diffusivity
C)shear stress to thermal diffusivity
D)thermal diffusivity to kinematic viscosity

Question 21

Pumps increase______________  

A)pressure
B)velocity
C)momentum
D)heat

Question 22

Which among the following is the formula for volumetric flow rate?

A)q = v/a
B)q = av
C)q = a+v
D)q = a-v

Question 23

Which among the following is the formula for mass flow rate?

A)q = m/p
B)q = mp
C)q = m + p
D)q = m - p

Question 24

Compressible flow mainly deals with

A)solid dynamics
B)liquid dynamics
C)gas dynamics
D)solid and liquid dynamics

Question 25

Which among the following is an assumption of the compressible flow?

A)resistance to flow of object
B)no-slip condition
C)known mass flow rate
D)resistance to flow of heat