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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 points**Assertion:**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.CorrectIncorrect - Question 2 of 13
##### 2. Question

1 points**Assertion:**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.CorrectIncorrect - Question 3 of 13
##### 3. Question

1 points**Assertion:**For submerged bodies, static forces in the lateral direction are balanced.**Reason:**For submerged bodies, static forces in the vertical direction are not balanced.CorrectIncorrect - Question 4 of 13
##### 4. Question

1 points**Assertion:**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.CorrectIncorrect - Question 5 of 13
##### 5. Question

1 points**Assertion:**Gravity influences the pipe flow.**Reason:**Gravity term (g) appears explicitly in Darcy-Weisbach formula for pipe flow resistance.CorrectIncorrect - Question 6 of 13
##### 6. Question

1 points**Assertion:**Ψ = 14.14y -10x represents uniform flow at an angle of 45° o the x-axis with a velocity of 24.14 units along the x-axis.**Reason:**The velocity component is derivable from the appropriate sum of the partial derivatives.CorrectIncorrect - Question 7 of 13
##### 7. Question

1 points**Assertion:**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.CorrectIncorrect - Question 8 of 13
##### 8. Question

1 points**Assertion:**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.CorrectIncorrect - Question 9 of 13
##### 9. Question

1 points**Assertion:**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.CorrectIncorrect - Question 10 of 13
##### 10. Question

1 points**Assertion:**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.CorrectIncorrect - Question 11 of 13
##### 11. Question

1 points**Assertion:**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 non-repeating variables are expressed as the exponents of repeating variables.CorrectIncorrect - Question 12 of 13
##### 12. Question

1 points**Assertion:**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.CorrectIncorrect - Question 13 of 13
##### 13. Question

1 points**Assertion:**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.CorrectIncorrect