# Hydraulic Machines-Fluid Machineries – Set 08

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(A) μπ²NR/60t
(B) μπ²NR²/60t
(C) μπ²NR³/60t
(D) μπ²NR⁴/60t

## Q2. Practical fluids

(A) Are viscous
(B) Possess surface tension
(C) Are compressible
(D) Possess all the above properties

Answer: (D) Possess all the above properties

## Q4. The pressure measured with the help of a pressure gauge is called

(A) Atmospheric pressure
(B) Gauge pressure
(C) Absolute pressure
(D) Mean pressure

## Q5. In a static fluid

(A) Resistance to shear stress is small
(B) Fluid pressure is zero
(C) Linear deformation is small
(D) Only normal stresses can exist

Answer: (D) Only normal stresses can exist

(A) Rectangular
(B) Triangular
(C) Trapezoidal
(D) Circular

(A) Newton-sec/m
(B) Newton-m/sec
(C) Newton/m
(D) Newton

## Q8. The surface tension of mercury at normal temperature is __ that of water.

(A) Same as
(B) Lower than
(C) Higher than
(D) None of these

(A) v²/2g
(B) 0.5v²/2g
(C) 0.375v²/2g
(D) 0.75v²/2g

## Q10. Alcohol is used in manometers because

(A) It has low vapour pressure
(B) It is clearly visible
(C) It has low surface tension
(D) It can provide longer column due to low density

Answer: (D) It can provide longer column due to low density

## Q11. The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

(A) π w ω² r²/4g
(B) π w ω² r³/4g
(C) π w ω² r⁴/4g
(D) π w ω² r²/2g

Answer: (C) π w ω² r⁴/4g

(C) Uniform
(D) Laminar

(A) 2.89 kN
(B) 8.29 kN
(C) 9.28 kN
(D) 28.9 kN

## Q14. Dynamic viscosity of most of the liquids with rise in temperature

(A) Increases
(B) Decreases
(C) Remain unaffected
(D) Unpredictable

## Q15. The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

(A) (μπ²N/60t) × (R₁ – R₂)
(B) (μπ²N/60t) × (R₁² – R₂²)
(C) μπ²N/60t) × (R₁³ – R₂³)
(D) (μπ²N/60t) × (R₁⁴ – R₂⁴)

Answer:(D) (μπ²N/60t) × (R₁⁴ – R₂⁴)

(A) ML°T⁻²
(B) ML°T
(C) ML r²
(D) ML²T²

(A) Velocity
(B) (Velocity)2
(C) (Velocity)3
(D) (Velocity)4

## Q18. Dynamic viscosity of most of the gases with rise in temperature

(A) Increases
(B) Decreases
(C) Remain unaffected
(D) Unpredictable

## Q19. A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by

(A) l/d² = (l₁/d₁²) + (l₂/d₂²) + (l₃/d₃²)
(B) l/d³ = (l₁/d₁³) + (l₂/d₂³) + (l₃/d₃³)
(C) l/d⁴ = (l₁/d₁⁴) + (l₂/d₂⁴) + (l₃/d₃⁴)
(D) l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)

Answer: (D) l/d⁵ = (l₁/d₁⁵) + (l₂/d₂⁵) + (l₃/d₃⁵)

## Q20. The viscosity of water at 20°C is

(A) One stoke
(B) One centistoke
(C) One poise
(D) One centipoise