Chemical Engineering Problems & Solutions Mechanical Operations - Set 24 - ObjectiveBooks

Chemical Engineering Problems & Solutions Mechanical Operations - Set 24

Practice Test: Question Set - 24

1. The grinding in a hammer crusher takes place due to the
    (A) Attrition
    (B) Impact
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

2. Which of the following can be most effectively used for clarification of lube oil and printing ink?
    (A) Sparkler filter
    (B) Pre-coat filter
    (C) Disc-bowl centrifuge
    (D) Sharpies super-centrifuge

3. The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt.
    (A) Speed
    (B) Thickness
    (C) Length
    (D) None of these

4. Half the angle of nip, (α), for a roll crusher is given by (where, drdp and df are diameters of crushing rolls, feed particles and rolls gap respectively).
    (A) cos α = (dr + dp)/(dr + df)
    (B) cos α = (dr + df)/(dr + dp)
    (C) tan α = (dr + dp)/(dr + df)
    (D) sin α = (dr + dp)/(dr + df)

5. Size reduction does not occur due to compression in case of
    (A) Rod mills
    (B) Gyratory crushers
    (C) Jaw crushers
    (D) Smooth roll crushers

6. Mixer used for rubber compounding is
    (A) Mixer-extruder
    (B) Banbury internal mixer
    (C) Muller mixer
    (D) Pug mill

7. Mass flow of granular solid (M) through a circular opening of dia, D follows
    (A) M  √D
    (B) M  D2
    (C) M  D3
    (D) M  D

8. Froth floatation is the most suitable for treating
    (A) Iron ores
    (B) Sulphide ores
    (C) Quartzite
    (D) None of these

9. A pebble mill
    (A) Is a ball mill
    (B) Employs flints or ceramic pebbles as the grinding medium
    (C) Is a tube mill lined with ceramic or other non-metallic liner
    (D) Both (b) and (c)

10. Which of the following must be stored in silos and not in open yard?
    (A) Coke breeze
    (B) High V.M. bituminous coal
    (C) Sand
    (D) None of these

11. In a mixer, the quantity, (vL/D) is termed as __________ number (where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).
    (A) Weber
    (B) Peclet
    (C) Brinkman
    (D) Schmidt

12. Sulphuric acid mist is arrested by using a __________ scrubber.
    (A) Packed wet
    (B) Hollow wet
    (C) Venturi
    (D) Co-current

13. In a roll crusher, both the rolls
    (A) Have the same diameter
    (B) Are rotated towards each other
    (C) Run either at the same or different speeds
    (D) All (a), (b) and (c)

14. Addition of filter aid to the slurry before filtration is done to __________ of the cake.
    (A) Increase the porosity
    (B) Increase the compressibility co-efficient
    (C) Decrease the porosity
    (D) Decrease the compressibility co-efficient

15. In froth floatation, chemical agent added to cause air adherence is called
    (A) Collector
    (B) Frother
    (C) Modifier
    (D) Activator

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