Practice Test: Question Set - 01
1. In case of a hammer crusher, the
- (A) Feed may be
highly abrasive (Moh's scale > 5)
- (B) Minimum
product size is 3 mm
- (C) Maximum feed
size may be 50 mm
- (D) Rotor
shaft carrying hammers can be vertical or horizontal
2. A gravity decanter is meant for the separation of two __________ density.
- (A) Immiscible
liquids of different
- (B) Miscible
liquids of different
- (C) Immiscible
liquids of same
- (D) Miscible
liquids of same
3. Which of the following is not used as filter aid?
- (A) Asbestos
- (B) Diatomaceous
earth
- (C) Purified
wood cellulose
- (D) Rice
husk
4. To get a fine talc powder from its granules, the equipment used is
- (A) Roller
crusher
- (B) Ball mill
- (C) Jaw
crusher
- (D) Gyratory
crusher
5. Which of the following mechanical conveyors does not come under the division ‘carriers’?
- (A) Belt
conveyor
- (B) Bucket
elevator
- (C) Screw
conveyor
- (D) Apron
conveyor
6. As per Taggart's formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms).
- (A) LS
- (B) 93 LS
- (C) 250 LS
- (D) √(LS)
7. Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.
- (A) <
5
- (B) 10 to 25
- (C) <
74
- (D) > 1000
8. With increase in the capacity of screens, the screen effectiveness
- (A) Remains
unchanged
- (B) Increases
- (C) Decreases
- (D) Decreases
exponentially
9. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
- (A) 0.5 D
- (B) D
- (C) 1.5 D
- (D) 2 D
10. Filtration of water in a paper mill is done by a/an __________ filter.
- (A) Open
sand
- (B) Plate
and frame
- (C) Vacuum leaf
- (D) Sparkler
11. Angle of nip of the crushing rolls does not depend upon the
- (A) Diameter
of the rolls
- (B) Speed
of the rolls
- (C) Product
size
- (D) Feed size
12. Reciprocal of sphericity is termed as the
- (A) Specific
surface ratio
- (B) Shape
factor
- (C) Sauter
diameter
- (D) Surface
area per unit mass
13. Which of the following grinding mills has the horizontally arranged rods as the grinding elements thereby delivering more uniform granular products with minimum fines?
- (A) Compartment
mill
- (B) Rod
mill
- (C) Pebble mill
- (D) Tube mill
14. As particle size is reduced
- (A) Screening
becomes progressively more difficult
- (B) Screening
becomes progressively easier
- (C) Capacity
and effectiveness of the screen is increased
- (D) None
of these
15. Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
- (A) Kozeny-Carman
- (B) Hagen-Poiseuille’s
- (C) Fanning's
- (D) Kremser