Mechanical Operations Questions and Answers – Continuous Rotary Filters

This set of Mechanical Operations Problems focuses on “Continuous Rotary Filters”.

1. From 300 and 10,000, the pattern is in range of _______
a) Transition
b) Laminar
c) Transient
d) Eddy
View Answer

Answer: a
Explanation: In general, below a Reynold’s number of 300, all impellors give viscous flow mixing between 300 and 10,000 the action is turbulent.

2. _______ is a method of mixing used with deformable plastic.
a) Stumping
b) Threading
c) Kneading
d) Carving
View Answer

Answer: c
Explanation: Kneading is a method of mixing used with deformable plastic, it involves squashing folding it over on itself and squashing again.

3. A masticator is also called as _______
a) Intensive mixer
b) Preventive mixer
c) Gauge mixer
d) Prang mixer
View Answer

Answer: a
Explanation: A two arm kneader handles suspensions, pastes and light plastic masses, these are often called as intensive mixers.
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4. The desired ratio for kneaders is ________
a) 1.5:1
b) 2:1
c) 3:1
d) 4:1
View Answer

Answer: a
Explanation: The circles of rotation of blades are usually tangential, so that the blades overlap in a desired ratio of 1.5:1.

5. To achieve successful mixing, the velocities imparted to the liquid are maximized by _______
a) Shafts
b) Impellors
c) Baffles
d) Turbines
View Answer

Answer: c
Explanation: To achieve successful mixing, the radial and longitudinal velocities imparted to the liquid are maximised by baffles, off-centre or angled mixer shafts, or angled blades.

6. _____ mixing is achieved by creating and recombining fresh surfaces.
a) Efficient
b) Worst
c) Economic
d) Normal
View Answer

Answer: a
Explanation: Efficient mixing is achieved by creating and recombining fresh surfaces in the mixture as often as possible, it is necessary either to move the mixer blades throughout the vessel.

7. ______ are used to avoid buildup of sticky material.
a) Overlapping blades
b) Sigma blades
c) Impellor
d) Propeller
View Answer

Answer: a
Explanation: Overlapping blades are used to avoid the buildup of sticky material on the blades while with tangential blades it is not so.
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8. Which of the following is best for kneading?
a) Sigma
b) Propeller
c) Impellor
d) Agitator
View Answer

Answer: a
Explanation: The common sigma blade is used for general purpose of kneading, it is capable of starting and operating with other solids and liquids.

9. _____ is used for rough and rubber type materials.
a) Exhausting
b) Multiwipping
c) Seeking
d) Multiscraping
View Answer

Answer: b
Explanation: Multiwipping overlapping blades are used for the mixture which are tough and rubber like, the blade cuts the material into pieces.
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10. What is the range impellor diameter?
a) 30 to 60% of diameter
b) 50 to 80% of diameter
c) 100% of diameter
d) 10 to 30% of diameter
View Answer

Answer: a
Explanation: The impellor diameter is usually between 30 to 60% of the tank diameter, usually with two or four blades they may be high.

Sanfoundry Global Education & Learning Series – Mechanical Operations.

To practice all areas of Mechanical Operations Problems, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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