ball mill of mcq

the ball class 10 mcq questions with answers english poem 5 learn cram

the ball class 10 mcq questions with answers english poem 5 learn cram

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ball mill critical speed

ball mill critical speed

A Ball Mill Critical Speed(actually ball, rod, AG or SAG) is the speed at which thecentrifugal forces equal gravitational forces at the mill shells inside surface and no balls will fall from its position onto the shell.

The mill speed is typically defined as the percent of the Theoretical Critical Speed, often abbreviated as %Cs. The Theoretical Critical Speed (Cs) of rotation is the speed (in RPM) at which an infinitely small particle will cling to the inside of the liners for a complete revolution. The percent of critical speed is the ratio (expressed as a percentage) of the actual mill speed and the Theoretical Critical Speed of that mill. The critical speed of a rotating mill is the RPM at which a grinding medium will begin to centrifuge, namely will start rotating with the milland therefore cease to carry out useful work.

Ball and SAG Mills are driven in practice at a speed corresponding to 60-81% of the critical speed, the choice of speed being influenced by economical considerations. Within that range the power is nearly proportional to the speed.

ball mill - mechanical operations questions and answers - sanfoundry

ball mill - mechanical operations questions and answers - sanfoundry

1. What is the average particle size of ultra-fine grinders? a) 1 to 20 m b) 4 to 10 m c) 5 to 200 m d) 50 to 100 m View AnswerAnswer: a Explanation: The particle averaging 1 to 2 m in size with substantially all particles through a standard 325 mesh screen. advertisement 2. Which of the following uses impact and attrition? a) Ball mill b) Tumbling mill c) Ultra-fine grinders d) Hammer mill View AnswerAnswer: c Explanation: Grinding takes place due to impact and attrition, it consists set of swing hammers, rotor, classifier wheels and fan wheels. 3. What is the feed size for a Ultra-Fine grinder? a) > 34 inches b) < 34 inches c) > 12 inches d) < 12 inches View AnswerAnswer: b Explanation: The feed size of ultra-fine grinder is less than 34 inches and the product sizes between 1 to 20 micro meter passing through 100 mesh. advertisement advertisement 4. The fluid energy mill involves __________ a) Pressure b) Temperature c) Fluid d) Density View AnswerAnswer: a Explanation: The fluid energy mill usually uses compressed air and super-heated steam admitted at a pressure of 7 atm through nozzles. 5. At what speed stirred mill operates? a) 50 to 500 rpm b) 5 to 10 rpm c) 10 to 500 rpm d) 100 to 1500 rpm View AnswerAnswer: d Explanation: In a stirred mill, a central paddle wheel or impellor armature stirs the media at speed from 100 to 1500 rpm. advertisement 6. What does colloid mill produces? a) Emulsions and Solid dispersions b) Wet and dry products c) Coarse and fine particles d) Broad particles View AnswerAnswer: a Explanation: Colloidal suspensions, emulsions and solid dispersions are produced by means of colloid mills or dispersions mills. 7. The clearance between rotor and stator is ______ a) 5 to 10 mm b) 1 to 2.5 mm c) 0 to 1.25 mm d) 5 to 15 mm View AnswerAnswer: c Explanation: The mill consists of a flat rotor and stator, the clearance between the rotor and stator is generally 1 to 1.25 mm. advertisement 8. The power consumption of colloid mill is _______ a) Very low b) Optimum c) Critical d) Very high View AnswerAnswer: d Explanation: The power consumption is very high and the material should therefore be ground as fine as possible before it is fed to mill. 9. The speed of a rotary knife cutter is ___ a) 100 to 500 rev/min b) 200 to 900 rev/min c) 400 to 600 rev/min d) 50 to 60 rev/min View AnswerAnswer: c Explanation: A rotary knife cutter contains a horizontal rotor turning at 200 to 900 revolutions per minute, which is cylindrical chamber. advertisement 10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

2. Which of the following uses impact and attrition? a) Ball mill b) Tumbling mill c) Ultra-fine grinders d) Hammer mill View AnswerAnswer: c Explanation: Grinding takes place due to impact and attrition, it consists set of swing hammers, rotor, classifier wheels and fan wheels.

3. What is the feed size for a Ultra-Fine grinder? a) > 34 inches b) < 34 inches c) > 12 inches d) < 12 inches View AnswerAnswer: b Explanation: The feed size of ultra-fine grinder is less than 34 inches and the product sizes between 1 to 20 micro meter passing through 100 mesh. advertisement advertisement 4. The fluid energy mill involves __________ a) Pressure b) Temperature c) Fluid d) Density View AnswerAnswer: a Explanation: The fluid energy mill usually uses compressed air and super-heated steam admitted at a pressure of 7 atm through nozzles. 5. At what speed stirred mill operates? a) 50 to 500 rpm b) 5 to 10 rpm c) 10 to 500 rpm d) 100 to 1500 rpm View AnswerAnswer: d Explanation: In a stirred mill, a central paddle wheel or impellor armature stirs the media at speed from 100 to 1500 rpm. advertisement 6. What does colloid mill produces? a) Emulsions and Solid dispersions b) Wet and dry products c) Coarse and fine particles d) Broad particles View AnswerAnswer: a Explanation: Colloidal suspensions, emulsions and solid dispersions are produced by means of colloid mills or dispersions mills. 7. The clearance between rotor and stator is ______ a) 5 to 10 mm b) 1 to 2.5 mm c) 0 to 1.25 mm d) 5 to 15 mm View AnswerAnswer: c Explanation: The mill consists of a flat rotor and stator, the clearance between the rotor and stator is generally 1 to 1.25 mm. advertisement 8. The power consumption of colloid mill is _______ a) Very low b) Optimum c) Critical d) Very high View AnswerAnswer: d Explanation: The power consumption is very high and the material should therefore be ground as fine as possible before it is fed to mill. 9. The speed of a rotary knife cutter is ___ a) 100 to 500 rev/min b) 200 to 900 rev/min c) 400 to 600 rev/min d) 50 to 60 rev/min View AnswerAnswer: c Explanation: A rotary knife cutter contains a horizontal rotor turning at 200 to 900 revolutions per minute, which is cylindrical chamber. advertisement 10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

4. The fluid energy mill involves __________ a) Pressure b) Temperature c) Fluid d) Density View AnswerAnswer: a Explanation: The fluid energy mill usually uses compressed air and super-heated steam admitted at a pressure of 7 atm through nozzles. 5. At what speed stirred mill operates? a) 50 to 500 rpm b) 5 to 10 rpm c) 10 to 500 rpm d) 100 to 1500 rpm View AnswerAnswer: d Explanation: In a stirred mill, a central paddle wheel or impellor armature stirs the media at speed from 100 to 1500 rpm. advertisement 6. What does colloid mill produces? a) Emulsions and Solid dispersions b) Wet and dry products c) Coarse and fine particles d) Broad particles View AnswerAnswer: a Explanation: Colloidal suspensions, emulsions and solid dispersions are produced by means of colloid mills or dispersions mills. 7. The clearance between rotor and stator is ______ a) 5 to 10 mm b) 1 to 2.5 mm c) 0 to 1.25 mm d) 5 to 15 mm View AnswerAnswer: c Explanation: The mill consists of a flat rotor and stator, the clearance between the rotor and stator is generally 1 to 1.25 mm. advertisement 8. The power consumption of colloid mill is _______ a) Very low b) Optimum c) Critical d) Very high View AnswerAnswer: d Explanation: The power consumption is very high and the material should therefore be ground as fine as possible before it is fed to mill. 9. The speed of a rotary knife cutter is ___ a) 100 to 500 rev/min b) 200 to 900 rev/min c) 400 to 600 rev/min d) 50 to 60 rev/min View AnswerAnswer: c Explanation: A rotary knife cutter contains a horizontal rotor turning at 200 to 900 revolutions per minute, which is cylindrical chamber. advertisement 10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

5. At what speed stirred mill operates? a) 50 to 500 rpm b) 5 to 10 rpm c) 10 to 500 rpm d) 100 to 1500 rpm View AnswerAnswer: d Explanation: In a stirred mill, a central paddle wheel or impellor armature stirs the media at speed from 100 to 1500 rpm. advertisement 6. What does colloid mill produces? a) Emulsions and Solid dispersions b) Wet and dry products c) Coarse and fine particles d) Broad particles View AnswerAnswer: a Explanation: Colloidal suspensions, emulsions and solid dispersions are produced by means of colloid mills or dispersions mills. 7. The clearance between rotor and stator is ______ a) 5 to 10 mm b) 1 to 2.5 mm c) 0 to 1.25 mm d) 5 to 15 mm View AnswerAnswer: c Explanation: The mill consists of a flat rotor and stator, the clearance between the rotor and stator is generally 1 to 1.25 mm. advertisement 8. The power consumption of colloid mill is _______ a) Very low b) Optimum c) Critical d) Very high View AnswerAnswer: d Explanation: The power consumption is very high and the material should therefore be ground as fine as possible before it is fed to mill. 9. The speed of a rotary knife cutter is ___ a) 100 to 500 rev/min b) 200 to 900 rev/min c) 400 to 600 rev/min d) 50 to 60 rev/min View AnswerAnswer: c Explanation: A rotary knife cutter contains a horizontal rotor turning at 200 to 900 revolutions per minute, which is cylindrical chamber. advertisement 10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

6. What does colloid mill produces? a) Emulsions and Solid dispersions b) Wet and dry products c) Coarse and fine particles d) Broad particles View AnswerAnswer: a Explanation: Colloidal suspensions, emulsions and solid dispersions are produced by means of colloid mills or dispersions mills. 7. The clearance between rotor and stator is ______ a) 5 to 10 mm b) 1 to 2.5 mm c) 0 to 1.25 mm d) 5 to 15 mm View AnswerAnswer: c Explanation: The mill consists of a flat rotor and stator, the clearance between the rotor and stator is generally 1 to 1.25 mm. advertisement 8. The power consumption of colloid mill is _______ a) Very low b) Optimum c) Critical d) Very high View AnswerAnswer: d Explanation: The power consumption is very high and the material should therefore be ground as fine as possible before it is fed to mill. 9. The speed of a rotary knife cutter is ___ a) 100 to 500 rev/min b) 200 to 900 rev/min c) 400 to 600 rev/min d) 50 to 60 rev/min View AnswerAnswer: c Explanation: A rotary knife cutter contains a horizontal rotor turning at 200 to 900 revolutions per minute, which is cylindrical chamber. advertisement 10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

7. The clearance between rotor and stator is ______ a) 5 to 10 mm b) 1 to 2.5 mm c) 0 to 1.25 mm d) 5 to 15 mm View AnswerAnswer: c Explanation: The mill consists of a flat rotor and stator, the clearance between the rotor and stator is generally 1 to 1.25 mm. advertisement 8. The power consumption of colloid mill is _______ a) Very low b) Optimum c) Critical d) Very high View AnswerAnswer: d Explanation: The power consumption is very high and the material should therefore be ground as fine as possible before it is fed to mill. 9. The speed of a rotary knife cutter is ___ a) 100 to 500 rev/min b) 200 to 900 rev/min c) 400 to 600 rev/min d) 50 to 60 rev/min View AnswerAnswer: c Explanation: A rotary knife cutter contains a horizontal rotor turning at 200 to 900 revolutions per minute, which is cylindrical chamber. advertisement 10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

8. The power consumption of colloid mill is _______ a) Very low b) Optimum c) Critical d) Very high View AnswerAnswer: d Explanation: The power consumption is very high and the material should therefore be ground as fine as possible before it is fed to mill. 9. The speed of a rotary knife cutter is ___ a) 100 to 500 rev/min b) 200 to 900 rev/min c) 400 to 600 rev/min d) 50 to 60 rev/min View AnswerAnswer: c Explanation: A rotary knife cutter contains a horizontal rotor turning at 200 to 900 revolutions per minute, which is cylindrical chamber. advertisement 10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

9. The speed of a rotary knife cutter is ___ a) 100 to 500 rev/min b) 200 to 900 rev/min c) 400 to 600 rev/min d) 50 to 60 rev/min View AnswerAnswer: c Explanation: A rotary knife cutter contains a horizontal rotor turning at 200 to 900 revolutions per minute, which is cylindrical chamber. advertisement 10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

10. ______ indicates the impact of resistance. a) Toughness b) Rigidity c) Brittleness d) Fatigue View AnswerAnswer: a Explanation: Toughness indicates the impact of resistance. It is the inverse of friability and brittleness, it is also a deciding factor for commutation. 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. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Telegram | Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Youtube | LinkedIn | Instagram | Facebook | Twitter | Pinterest Prev - Mechanical Operations Questions and Answers Intermediate and Fine Crushers Next - Mechanical Operations Questions and Answers Advantages of Ball Mill

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