Free Fluid Flow Operations MCQs with Answers
909 Fluid Flow Operations MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Last updated
909 questions · page 46 of 46
- A. gm . cm2 . sec-2
- B. gm .cm-1 sec-1
- C. gm .cm-2, sec-1
- D. gm . cm . sec-1
Explanation: Dynamic viscosity has dimensions mass per length per time, so in CGS units it is g cm⁻¹ s⁻¹, called the poise.
Correct answer: gm .cm-1 sec-1902. Good design of the casing of a centrifugal pump aims at minimising the __________________________?
- A. Cavitation
- B. Frictional losses
- C. Kinetic energy loss
- D. Static head
Explanation: The casing of a centrifugal pump converts much of the impeller discharge velocity into pressure through gradual deceleration.
Correct answer: Kinetic energy loss- A. Vg
- B. 1/V2
- C. 1/Vg
- D. V2
Explanation: Newton’s law gives shear stress as τ = μ(dV/dy), so it is proportional to the velocity gradient, represented here by Vg.
Correct answer: Vg- A. Upward thrust due to air
- B. Viscous force exerted by air
- C. Surface tension effects of water
- D. Force of gravity
Explanation: As a raindrop accelerates, air resistance increases until it balances the effective downward force, so the drop stops accelerating and…
Correct answer: Viscous force exerted by air- A. Newton's second law of motion
- B. Law of projectiles
- C. Newton's third law of motion
- D. Archimedes principle
Explanation: A rocket ejects gases backward at high velocity, producing an equal and opposite forward reaction on the rocket.
Correct answer: Newton's third law of motion- A. Weight
- B. Head developed
- C. Overall efficiency
- D. Flow output
Explanation: A double-acting reciprocating pump delivers liquid during both strokes, whereas a single-acting pump delivers during only one stroke.
Correct answer: Flow output- A. Density
- B. Surface tension
- C. Viscosity
- D. Buoyancy
Explanation: Hydrostatic pressure increases with liquid density according to p = ρgh, for a specified depth and gravitational field.
Correct answer: Density- A. To increase the pump discharge rate
- B. To increase the pump efficiency
- C. To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at
- D. constant velocity
- E. To reduce the head loss in discharge
Explanation: A volute collects liquid leaving the impeller and converts part of its velocity head into pressure head, improving recovery and…
Correct answer: To increase the pump discharge rate- A. Unsteady uniform
- B. Steady uniform
- C. Unsteady non-uniform
- D. Steady non-uniform
Explanation: During a flood, the river discharge and depth change with time, so the flow is unsteady.
Correct answer: Unsteady non-uniform