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# Unit Operations and Mass Transfer Online Exam Quiz

Important questions about Unit Operations and Mass Transfer. Unit Operations and Mass Transfer MCQ questions with answers. Unit Operations and Mass Transfer exam questions and answers for students and interviews.

### Statement 1: Bernoulli’s equation can be applied to flow through pipes both, with and without friction. Statement 2: Air is an incompressible fluid.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

### What is Kinetic Energy Factor in the Bernoulli’s equation?

Options

A : a. It is because friction varies

B : b. It is because friction stays constant

C : c. It is because the velocity in every layer varies and only the average velocity is accounted hence a correction factor is a need

D : d. None of the mentioned

### In Bernoulli’s equation, the friction correction factor is added to the LHS and the energy contributed by the pump is written on the RHS.

Options

A : a. True

B : b. False

C : c. May be True or False

D : d. Can't say

### Statement 1: Reynolds number is the ratio of viscous force to Inertial Force. Statement 2: The thickness of Boundary layer increases with the increase in distance from the surface.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

### The energy loss due to the friction at the walls of a pipe is called _____

Options

A : a. Kinetic friction

B : b. Skin friction

C : c. Static friction

D : d. None of the mentioned

### Statement 1: Friction factor ‘f’ is an important factor in turbulent flow. Statement 2: ‘f’ is the ratio of shear stress (?w) to kinetic energy head ((?v²)?2g).

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

### Which of the following pumps is this pump- It has no rotating or reciprocating parts involved. No leakage. Air/gas used to impart energy.

Options

A : a. Piston pump

B : b. Diaphragm pump

C : c. Gear pump

D : d. Air-lift pump

### Statement 1: Non-Newtonian fluids have a linear relationship between shear stress and shear strain. Statement 2: Tubes are larger than pipes in diameter and have thicker walls.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

### Pipes are described in the form of _____

Options

A : a. None of the mentioned

B : b. Formation Number

C : c. All of the mentioned

D : d. Schedule Number

### Statement 1: Two pipes are joined using _____ Statement 2: The sealing material between two pipes to be joined is called _____

Options

A : a. Union Joint, Coupling

C : c. Coupling, Thread cuttings

### Statement 1: When an additional connection such as a valve/ tap is to be added, _____ is used. Statement 2: Bents have more pressure drop than elbows.

Options

A : a. Union joint, True

B : b. Union joint, False

C : c. T- joint, True

D : d. T- joint, False

### Which of the following is true about On-Off Control?

Options

A : a. On-Off valves are called Plug Cocks

B : b. The size of the valve path is as big as the pipe itself

C : c. Pressure drop in these is the least compared to all other valves

D : d. All of the mentioned

### Statement 1: For rough control of flow _____ are used. Statement 2: For fine control of flow _____ are used.

Options

A : a. Needle valves, Globe valves

B : b. Needle valves, Gate valves

C : c. Globe valves, Needle valves

D : d. Gate valves, Globe valves

### Which of the following is untrue about non-return valves?

Options

A : a. They’re also called foot valves as they’re present at the foot of centrifugal pumps to prevent priming

B : b. They prevent flow in the opposite direction even if the pressure increases in the opposite direction

C : c. All of the mentioned

D : d. None of the mentioned

### Statement 1: Generally needle valves are not used for liquids. Statement 2: For a unidirectional flow, non return valves are used.

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

### Which of the following is true about Centrifugal pumps?

Options

A : a. It’s suitable for corrosive and toxic fluids

B : b. It has a high pressure head

C : c. Priming is not needed

D : d. None of the mentioned

### Which of the following is true about Rotary pumps?

Options

A : a. These consist of gear pumps which create high pressures

B : b. In internal gear pumps, a pinion gear is driven by a motor which is eccentric and the ring gear is co-axial and is driven by the pinion gear

C : c. In Spur gears, vacuum created allows liquid to flow from suction to delivery line

D : d. All of the mentioned

### Statement 1: Diaphragm pumps can handle corrosive material and do not have leakage problems, but, they only vibrate hence the output is low. Statement 2: Diaphragm pump is an example of _____

Options

A : a. True, negative displacement pump

B : b. True, positive displacement pump

C : c. False, negative displacement pump

D : d. False, positive displacement pump

### Statement 1: Fans and blowers create pressure energy whereas compressors don’t. Statement 2: In food processing various liquids like milk and juices are transported by pumps

Options

A : a. True, False

B : b. True, True

C : c. False, False

D : d. False, True

### Drain pipes are present to remove _____

Options

A : a. Waste

B : b. Urea

C : c. Condensate

D : d. None of the mentioned