Mechanical Operations Questions and Answers – Cutting Machines

This set of Mechanical Operations Multiple Choice Questions & Answers (MCQs) focuses on “Cutting Machines”.

1. Which of the following is best for charging the particles?
a) Splitter
b) Bombardment
c) Striking
d) Abrasion
View Answer

Answer: b
Explanation: Ion bombardment is the strongest and perhaps the most efficient mechanism for charging solid particles.

2. If a dielectric and conductor are placed in path of mobile ions, then it will generate _____
a) Semi charge
b) Brake
c) Charge
d) Ions
View Answer

Answer: c
Explanation: A dielectric and conductor are when placed in path of mobile ions, a portion of the surface of each particle will be given a strong electrical charge.

3. If a particle is placed in a grounded surface, then _____
a) Mobiles ions are stopped
b) Charges get renewed
c) Flow of ions gets retarded
d) End of dielectric
View Answer

Answer: a
Explanation: If a group of particles is placed on a grounded surface in the path of these mobile ions, it will be found that mobile ions are stopped.
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4. What does the below diagram represent?

Plate type consists of plates that are vertical suspended relatively close to each other
a) Cyclone separator
b) Plate type separator
c) Craved separator
d) Twice separator
View Answer

Answer: b
Explanation: The plate type merely consists of two plates that are vertical suspended relatively close to each other grounded one or more positively or negatively charged.
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5. What is the capacity of a rotor type separator?
a) 1500 lb/hr
b) 2000 lb/hr
c) 3000 lb/hr
d) 500 lb/hr
View Answer

Answer: b
Explanation: One rotor gives sufficient type of capacity but the material need more than one pass to make a final product, capacities of these machines ranges from 1000 to 2000 lb/hr.

6. Separation of mixture using flotation depends up on ___
a) Volume
b) Surface
c) Bubble
d) Steep
View Answer

Answer: b
Explanation: Separation of a mixture depends up on the difference in the surface properties of the materials involved in separation.
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7. What agent can hold the particle on the fluid surface?
a) Hold agent
b) Bubble agent
c) Grignard’s reagent
d) Forth agent
View Answer

Answer: d
Explanation: If a suitable frothing agent is added to the liquid, the particles will be held on the surface by means of the forth.

8. _____ can increase the angle of contact.
a) Promoters
b) Fainter’s
c) Terminators
d) Forthers
View Answer

Answer: a
Explanation: The affinity of particle should be increased towards the fluid these can be done by increasing the angle of contact by adding suitable promoters.
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9. Which of the following is a known promoter?
a) Sodium ethyl Xanthate
b) Caustic soda
c) Soda Ash
d) M.M.A
View Answer

Answer: a
Explanation: A commonly used promoter is sodium ethyl xanthate has the formula Na(S) COC2H5, and
structure shown below.

Commonly used promoter is sodium ethyl xanthate has the formula Na(S) COC2H5

10. In sodium ethyl Xanthate, the Xanthate ions are ____
a) Positively charged
b) Negatively charged
c) Neutral
d) Van der Waal forces
View Answer

Answer: b
Explanation: In solution this material ionizes giving negatively charged Xanthate ions, the polar end of Xanthate ions is absorbed on new surface.

Sanfoundry Global Education & Learning Series – Mechanical Operations.

To practice all areas of Mechanical Operations, 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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