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Test Description :
Name: Fluid Machines & Hydraulic Machine – Assertion & Reasons question 2
Subject: Fluid Machines & Hydraulic Machine
Topic: Mix
Questions: 13
Time Allowed: 15 Minutes
Important for: Chemical Engineering, Civil Engineering and Mechanical Engineering B. tech / M Tech., GATE, IES and Job interviews.
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 Question 1 of 13
1. Question
1 pointsAssertion: Irrotational flow exists when the net rotation of the fluid about its mass centre is zero.
Reason: There is always a possibility of rotation in ideal fluid and therefore, ideal fluids cannot have irrotational flow.
CorrectIncorrectUnattempted  Question 2 of 13
2. Question
1 pointsAssertion: In an open channel flow, the maximum velocity filament does not occur on the free surface.
Reason: There is wind drag on the free surface of an open channel.
CorrectIncorrectUnattempted  Question 3 of 13
3. Question
1 pointsAssertion: For submerged bodies, static forces in the lateral direction are balanced.
Reason: For submerged bodies, static forces in the vertical direction are not balanced.
CorrectIncorrectUnattempted  Question 4 of 13
4. Question
1 pointsAssertion: At the critical state of flow, the specific force is a minimum for the given discharge.
Reason: For a minimum value of the specific force, the first derivation of force with respect to depth should be unity.
CorrectIncorrectUnattempted  Question 5 of 13
5. Question
1 pointsAssertion: Gravity influences the pipe flow.
Reason: Gravity term (g) appears explicitly in DarcyWeisbach formula for pipe flow resistance.
CorrectIncorrectUnattempted  Question 6 of 13
6. Question
1 pointsAssertion: Ψ = 14.14y 10x represents uniform flow at an angle of 45° o the xaxis with a velocity of 24.14 units along the xaxis.
Reason: The velocity component is derivable from the appropriate sum of the partial derivatives.
CorrectIncorrectUnattempted  Question 7 of 13
7. Question
1 pointsAssertion: When friction blocks are provided in a stilling basin to localize and stabilise the jump formation, the downstream depth in the jump is less than without the friction blocks.
Reason: The discharge per unit width at the section where the blocks are located is increased.
CorrectIncorrectUnattempted  Question 8 of 13
8. Question
1 pointsAssertion: The specific speed of a Pelton wheel is generally much less than that of a reaction turbine
Reason: Pelton wheels generally use more than one nozzle and the specific speed is defined for power developed per nozzle.
CorrectIncorrectUnattempted  Question 9 of 13
9. Question
1 pointsAssertion: Flow in the boundary layer is always laminar.
Reason: In turbulent flow on a smooth boundary, a laminar sublayer still exists within the boundary layer.
CorrectIncorrectUnattempted  Question 10 of 13
10. Question
1 pointsAssertion: A loss of head at a sudden constraction in a pipe is smaller than that at a sudden expansion.
Reason: When the flow contracts, tends to become irrotational.
CorrectIncorrectUnattempted  Question 11 of 13
11. Question
1 pointsAssertion: In Rayleigh’s method of dimensional analysis, the dependent variable is written as the function of exponential terms of independent variables.
Reason: In Rayleigh’s method, when the number of independent variables exceeds three, the exponents of nonrepeating variables are expressed as the exponents of repeating variables.
CorrectIncorrectUnattempted  Question 12 of 13
12. Question
1 pointsAssertion: If laminar flow of oil between two points of a given pipeline is doubled, then the power consumption is increased to four times the original power.
Reason: In laminar flow through circular pipes, head loss varies directly as the discharge.
CorrectIncorrectUnattempted  Question 13 of 13
13. Question
1 pointsAssertion: A hydraulic jump cannot be expected on a long steep slope (fed by a large reservoir) when it is followed by a short reach of adverse slope terminating in a vertical drop into a deep and wide reservoir.
Reason: The terminal depth in such an adverse slope reach will be critical and the flow in the steep slope may be nearly at or at normal depth.
CorrectIncorrectUnattempted