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Test: Compressible Flow & Flow Through Open Channel - 2


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30 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series | Test: Compressible Flow & Flow Through Open Channel - 2

Test: Compressible Flow & Flow Through Open Channel - 2 for Mechanical Engineering 2022 is part of GATE Mechanical (ME) 2023 Mock Test Series preparation. The Test: Compressible Flow & Flow Through Open Channel - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Compressible Flow & Flow Through Open Channel - 2 MCQs are made for Mechanical Engineering 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Compressible Flow & Flow Through Open Channel - 2 below.
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Test: Compressible Flow & Flow Through Open Channel - 2 - Question 1

Subsonic and supersonic diffusers have the following geometry

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 1

Ans. (a)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 2

A correctly designed convergent-divergent nozzle working at a designed load is:  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 2

Ans. (b) Divergent portion will be act as nozzle only if flow is supersonic for that it must be choked.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 3

The concentration of pressure pulses created by an object moving atMach number of 0.5 is: 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 3

Ans. (a) Pressure pulses moves with sonic velocity but object moves with half of sonic velocity so concentration of pressure pulse become larger ahead of the object.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 4

In isentropic flow between two points, the stagnation:[ 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 4

Ans. (d) Stagnation temperature cannot vary

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 5

For one-dimensional is entropic flow in a diverging passage, if the initial static pressure is P1 and the initial Mach number is M1 ( (M1 < 1),then for the down stream flow  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 5

Ans. (b) For down stream flow, M2 < M1 and P2 > P1 for diverging section and
subsonic flow conditions.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 6

Consider the following statements: 
1. De Laval nozzle is a subsonic nozzle.
2. Supersonic nozzle is a converging passage.
3. Subsonic diffuser is a diverging passage.
Which of these statements is/are correct?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 6

(d) Only third statement is correct, i.e. subsonic diffuser is a diverging passage.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 7

The critical pressure ratios for the flow of dry saturated and superheated steam through a nozzle are respectively.  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 7

Ans. (c) Critical pressure ratio for dry saturated and superheated steam through
a nozzle are 0.577 and 0.546.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 8

If the cross-section of a nozzle is increasing in the direction of flow insupersonic flow, then in the down stream direction. 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 8

Ans. (d)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 9

Steam pressures at the inlet and exit of a nozzle are 16 bar and 5·2 barrespectively and discharge is 0·28 m3/s. Critical pressure ratio is 0.5475.If the exit pressure is reduced to 3·2 bar then what will be the flow ratein m3/s?  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 9

Ans. (a) Flow Ratio remains constant for chocked condition. Therefore flow rate
will remain same even when there is decrease in the pressure to 3.2 bar.
∴ Flow rate in m3 / sec = 0.280 m3 / sec

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 10

Assertion (A): For pressure ratio greater than the critical pressure ratio, a convergent-divergent nozzle is required.  
Reason (R): Divergent portion increases the flow area which increasesthe mass flow rate.

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 10

Ans. (c) A is correct but R is wrong.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 11

Shear stress in a turbulent flow is due to:  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 11

Ans. (d)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 12

Reynolds stress may be defined as the 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 12

Ans. (c) Reynolds stress may be defined as additional shear stresses due to fluctuating velocity components in a turbulent flow.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 13

Consider the following statements regarding a hydraulic jump:
1. There occurs a transformation of super critical flow to sub-criticalflow.  
2. The flow is uniform and pressure distribution is due to hydrostatic force before and after the jump.
3. There occurs a loss of energy due to eddy formation and turbulence.
Which of these statements are correct?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 13

Ans. (a)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 14

A convergent divergent nozzle is designed for a throat pressure 2.2MPa. If the pressure at the exit is 2.3 MPa, then the nature of the flow at the exit will be: 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 14

Ans. (c)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 15

Consider the following statements for compressible flow through avarying area passage: 
1. For a convergent nozzle, if the exit pressure is less than critical,external flow will not be isentropic.
2. Supersonic-subsonic diffuser would appear similar to nozzle and works without irreversibility.
Which of the statements given above is/are correct?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 15

Ans. (c)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 16

Which one of the following is proper for a normal shock wave?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 16

Ans. (b)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 17

Which of the following parameters decrease across a normal shock wave?  
1. Mach number
2. Static pressure
3. Stagnation pressure
4. Static temperature
Select the correct answer using the codes given below:

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 17

Ans. (a)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 18

Assertion (A): A convergent-divergent nozzle may give supersonic orsubsonic flow at the exit even if the throat is choked.  
Reason (R): Depending on the back pressure ratio Pb/Po the divergent part of the nozzle may act as a supersonic nozzle or a subsonic diffuser.

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 18

Ans. (a)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 19

In a normal shock in a gas, the:  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 19

Ans. (a)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 20

Across a normal shock wave in a converging-diverging nozzle foradiabatic flow, which of the following relations are valid? 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 20

Ans. (d)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 21

In a normal shock in a gas:  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 21

Ans. (c)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 22

The fluid property that remains unchanged across a normal shockwave is:

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 22

Ans. (a)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 23

A normal shock:  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 23

Ans. (b)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 24

Consider the following statements pertaining to one-dimensional isentropic flow in a convergent-divergent passage  
1. A convergent-divergent passage may function as a supersonicnozzle or a venturi depending on the back pressure.
2. At the throat, sonic conditions exits for subsonic or supersonic flowat the outlet.
3. A supersonic nozzle discharges fluid at constant rate even if the exit pressure is lower than the design pressure.
4. A normal shock appears in the diverging section of the nozzle if the back pressure is above the design pressure but below a certain minimum pressure for venturi operation.
Which of these statements are correct?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 24

Ans. (a) At the throat, sonic conditions not exits for subsonic flow when it is venture.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 25

Consider the following statements: 
Across the normal shock, the fluid properties change in such a mannerthat the
1. Velocity of flow is subsonic
2. Pressure increases
3. Specific volume decreases
4. Temperature decreasesOf these correct statements are

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 25

Ans. (d)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 26

Which one of the following is correct?  
In a normal shock wave in one dimensional flow,

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 26

Ans. (b) Entropy increases across a shock with consequent decrease in stagnation
pressure and stagnation density across the shock.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 27

Assertion (A): A normal shock wave can occur at any section in aconvergent-divergent nozzle. 
Reason (R): A normal shock wave occurs only when the flow of the fluidis supersonic and the subsequent flow after the shock is subsonic.

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 27

Ans. (d) A shock wave takes place in the diverging section of a nozzle, in a diffuser, throat of a supersonic wind tunnel, in front of sharp-nosed bodies.

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 28

Assertion (A): A normal shock always makes a supersonic flow of acompressible fluid subsonic, but an oblique shock may not ensure subsonic flow after the shock.  
Reason (R): A normal shock reduces the stagnation pressure and stagnation enthalpy considerably whereas the loss at oblique shock isminimized.

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 28

Ans. (c)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 29

A converging diverging nozzle is connected to a gas pipeline.  
At the inlet of the nozzle (converging section) the Mach number is
2. Itis observed that there is a shock in the diverging section.
What is thevalue of the Mach number at the throat?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 29

Ans. (b)

Test: Compressible Flow & Flow Through Open Channel - 2 - Question 30

Introduction of a Pitot tube in a supersonic flow would produce 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 2 - Question 30

Ans. (a)

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