Mechanical Operations Mcqs

Q:

The ratio of initial particle size to final particle size is defined as _____

A) Reduction ratio B) Kick’s ratio
C) Rittingers ratio D) Bond’s ratio
 
Answer & Explanation Answer: B) Kick’s ratio

Explanation: Not available for this question

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733
Q:

As the rate of feed increases, the size reduction ____

A) Increases B) Remains constant
C) Equals D) Decreases
 
Answer & Explanation Answer: D) Decreases

Explanation: With high rate of feed, less size reduction is done since the material is retained in the mill for shorter time.

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671
Q:

Which of the following uses impact and attrition?

A) Ball mill B) Tumbling mill
C) Ultra-fine grinders D) Hammer mill
 
Answer & Explanation Answer: C) Ultra-fine grinders

Explanation: Grinding takes place due to impact and attrition, it consists set of swing hammers, rotor, classifier wheels and fan wheels.

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312
Q:

Which of the following is false about conveying systems?

A) An essential factor to consider before choosing the right conveyor system is the environment of operation B) Conveyors cannot be used as feeders
C) The composition of the material being conveyed is very important D) The surrounding temperature is one of the deciding factors
 
Answer & Explanation Answer: B) Conveyors cannot be used as feeders

Explanation: A conveyor can be used as a feeder also. The feeding action is more time sensitive and precise than the conveying action. The tumbling effect of a conveyor also becomes very crucial during the feeding action.

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246
Q:

Which of the following is false about conveyors?

A) Cleats can be used to prevent slipping B) Backstopping brakes are used for straight belts
C) Anti-static belts are used when electric components are conveyed D) Soft starters avoid overloading the motor
 
Answer & Explanation Answer: B) Backstopping brakes are used for straight belts

Explanation: Heavily loaded conveyors that are inclined, are prone to getting slipped backward and therefore, the backstopping brakes engage automatically with the de-energization of motors. Cleats are used to create separation between the products being conveyed and prevent slipping as well.

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229
Q:

Which of the following does an auxiliary equipment not do?

A) Act as a major equipment without which production is not possible B) An auxiliary equipment makes production easier
C) An auxiliary equipment enhances production in some cases D) An auxiliary equipment makes production dynamic
 
Answer & Explanation Answer: A) Act as a major equipment without which production is not possible

Explanation: Auxiliary equipment is an add-on equipment that makes production easier however, is not the main equipment used for production. They can enhance production and help in producing a variety of products for example, using Filling & Weighing station in a chocolate industry can help produce chocolate in different types of boxes.

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225
Q:

Which of the following is a correct description about the different types of conveyors?

A) Belt conveyor transports material in any direction B) Slat conveyor requires high maintenance
C) Vibrating conveyor can convey materials of any friction factor D) Screw conveyors usually handle lightweight materials
 
Answer & Explanation Answer: A) Belt conveyor transports material in any direction

Explanation: One of the major advantages of a belt conveyor is that, it can carry bulk materials in any direction. Slat conveyors are highly reliable and require low maintenance. In a vibrating conveyor, the material being carried should have a high friction factor with respect to steel so that, the conveying action can be transmitted throughout the material. Screw conveyor usually carries bulky materials.

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221
Q:

According to Rittingers law, work required is proportional to _________

A) Energy Consumed B) Surface area created
C) Final Volume D) Initial feed
 
Answer & Explanation Answer: B) Surface area created

Explanation: The Rittingers law states that “The work required in crushing is directly proportional to the new surface area created”.

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