Mechanical Operations

381. Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids (> 50000 centipoise)?

1. Propeller
2. Helical screw
3. Flat blade turbine
4. Curved blade turbine

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382. Which of the following can be most effectively used for clarification of lube oil and printing ink?

1. Sparkler filter
2. Pre-coat filter
3. Disc-bowl centrifuge
4. Sharpies super-centrifuge

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383. Which of the following clay mixing devices is vacuum operated for deairation of clay?

1. Banbury mixer
2. Pug mill
3. Muller-mixer
4. None of these

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384. Which of the following comes in the category of primary crusher for hard and tough stone?

1. Jaw crusher
2. Cone crusher
3. Gyratory crusher
4. None of these

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385. Which of the following conveyors cannot be recommended for transportation of abrasive materials?

1. Belt conveyor
2. Apron conveyor
3. Flight conveyor
4. Chain conveyor

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386. Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?

1. Rod mill
2. Fluid energy mill
3. Gyratory crusher
4. Ball mill

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387. Which of the following crushing laws is most accurately applicable to the fine grinding of materials?

1. Bond's crushing law
2. Kick's law
3. Rittinger's law
4. None of these

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388. Which of the following gives the crushing energy required to create new surface ?

1. Taggarts rule
2. Fick's law
3. Rittinger's Law
4. None of these

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389. Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?

1. Rittinger's law
2. Kick's law
3. Bond's law
4. None of these

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390. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?

1. Compartment mill
2. Rod mill
3. Pebble mill
4. Tube mill

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