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Test: Compressible Flow & Flow Through Open Channel - 1


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20 Questions MCQ Test RRB JE for Mechanical Engineering | Test: Compressible Flow & Flow Through Open Channel - 1

Test: Compressible Flow & Flow Through Open Channel - 1 for Mechanical Engineering 2022 is part of RRB JE for Mechanical Engineering preparation. The Test: Compressible Flow & Flow Through Open Channel - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Compressible Flow & Flow Through Open Channel - 1 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 - 1 below.
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Test: Compressible Flow & Flow Through Open Channel - 1 - Question 1

Net force on a control volume due to uniform normal pressure alone

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

Ans. (c)

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

In adiabatic flow with friction, the stagnation temperature along a streamline.................. 

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 3

Acoustic velocity in an elastic gaseous medium is proportional to:

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 3

Ans. (c)

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 4

Assertion (A): In a supersonic nozzle, with sonic condition at the throat, any reduction of down stream pressure will not be felt at the inlet of the nozzle. 
Reason (R): The disturbance caused downstream of supersonic flowstravels at sonic velocity which cannot propagate upstream by Machcone.

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 4

Ans. (a)

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 5

Consider the following statements pertaining to isentropic flow:
1. To obtain stagnation enthalpy, the flow need not be decelerate disentropically but should be decelerated adiabatically.
2. The effect of friction in an adiabatic flow is to reduce the stagnation pressure and increase entropy.
3. A constant area tube with rough surfaces can be used as a subsonicnozzle.
Of these correct statements are:  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 5

Ans. (d) To obtain stagnation enthalpy, the flow must be decelerated isentropically.

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 6

The Mach number at inlet of gas turbine diffuser is 0.3. The shape of the diffuser would be:  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 6

Ans. (b)

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 7

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 - 1 - Question 7

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

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 8

Consider the following statements: 
A convergent-divergent nozzle is said to be choked when
1. Critical pressure is attained at the throat.
2. Velocity at the throat becomes sonic.
3. Exit velocity becomes supersonic.
Of these correct statements are

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 8

Ans. (b) A convergent divergent nozzle is said to be choked when critical pressure
is attained at the throat and velocity at the throat becomes sonic.

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 9

Consider the following statements :
Choked flow through a nozzle means:
1. Discharge is maximum
2. Discharge is zero
3. Velocity at throat is supersonic
4. Nozzle exit pressure is less than or equal to critical pressure.
Which of the above statements is/are correct?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 9

Ans. (d)

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 10

Consider the following statements in relation to a convergent divergent steam nozzle operating under choked conditions:  
1. In the convergent portion steam velocity is less than sonic velocity
2. In the convergent portion steam velocity is greater than sonicvelocity
3. In the divergent portion the steam velocity is less them sonicvelocity
4. In the divergent portion the steam velocity is greater than sonicvelocity
Which of the above statements are correct?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 10

Ans. (b)

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 11

Which one of the following is correct?  
For incompressible flow a diverging section acts as a diffuser for upstream flow which is:

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 11

Ans. (c) For incompressible flow a diverging section acts as a diffuser for both
subsonic and supersonic. For compressible flow a diverging section acts as a diffuser for subsonic flow only.

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 12

In turbulent flow over an impervious solid wall  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 12

Ans. (d)

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 13

Match List-I (Flow depth) with List-II (Basic hydraulic condition associated there with) and select the correct answer:  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 13

Ans. (c) Only one matching (B with 3) will give us ans. (c) The depth of flow at which specific energy is minimum is called critical depth.

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 14

How is the best hydraulic channel cross-section defined? 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 14

Ans. (c)

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 15

Assertion (A): To have maximum hydraulic efficiency, the trapezoidal section of an open channel should be a half-hexagon 
Reason (R): For any cross-section, a hexagon has the lest-perimeter.

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 15

Ans. (c) We all knows that for any cross-section, a circular section has the lestperimeter.
So R is false.

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 16

A hydraulic jump occurs in a channel 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 16

Ans. (a) If the flow changes from supercritical to sub-critical. The hydraulic jump is defined as the sudden and turbulent passage of water from a supercritical state.

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 17

Consider the following statements: 
A hydraulic jump occurs in an open channel
1. When the Froude number is equal to or less than one.
2. At the toe of a spillway.
3. Downstream of a sluice gate in a canal.
4. When the bed slope suddenly changes.
Which of these are correct?

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 17

Ans. (c) Only 1 is wrong so (a), (b) and (d) out.

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 18

A sluice gate discharges water into a horizontal rectangular channel with a velocity of 12 m/s and depth of flow of 1 m. What is the depth offlow after the hydraulic jump?  

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 18

Ans. (c)




Test: Compressible Flow & Flow Through Open Channel - 1 - Question 19

An open channel flow encounters a hydraulic jump as shown in the figure. The following fluid flow conditions are observed between A andB: 
1. Critical depth
2. Steady non-uniform flow
3. Unsteady non-uniform flow
4. Steady uniform flow.
The correct sequence of the flow conditions in the direction of flow is:

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 19

Ans. (b)

Test: Compressible Flow & Flow Through Open Channel - 1 - Question 20

A hydraulic jump is formed in a 5.0 m wide rectangular channel with sequent depths of 0.2 m and 0.8 m. The discharge in the channel, inm3/s, is: 

Detailed Solution for Test: Compressible Flow & Flow Through Open Channel - 1 - Question 20

Ans. (c)


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