Agricultural Process Engineering Mid - I, September - 2014

1.The separator which is used to separate mustard from wheat is
  • Disk
  • Air screen cleaner
  • Spiral
  • Destoner
Answer: C
2.The removal of few large particles in initial process is known as
  • Cleaning
  • Scalping
  • Sifting
  • Sorting
Answer: B
3.The operating speeds of ball mill are kept at _____ of critical speed for grinding viscous suspensions.
  • 80%
  • 65%
  • 75%
  • 90%
Answer: B
4.The mixers which are best suited to the gentle blending of powders with similar characteristics are
  • Trough mixers
  • Pan mixers
  • Tumbling mixers
  • None
Answer: A
5.In a air screen cleaner, the length of the screen should be _____ times its width is generally recommended
  • 2 to 3 times
  • 1 to 2 times
  • 3 to 4 times
  • 4 to 5 times
Answer: A
6.Power requirement in case of liquid mixers is given by
  • Re = k(Po)n (Fr)m
  • Po = k(Re)n (Fr)m
  • Fr = k(Po)n (Re)m
  • Po = k(Po)n /(Fr)m
Answer: B
7.Mixing index is given by (M)
  • (So2 – S2)/ (So2 – Sr2)
  • (So2 – Sr2)/ (So2 – S2)
  • (So2 – Sr2)/ (S2 – Sr2)
  • (Sr2 – S2)/ (Sr2 – So2)
Answer: A
8.Commonly used mixing equipment for mixing dough and paste are
  • Ribbon blenders
  • Propeller mixer
  • Double cone blender
  • Kneaders
Answer: D
9.The machinery used for spice grinding and poultry feed grinding is
  • burr mill
  • Hammer mill
  • Ball mill
  • Ritz mill
Answer: B
10.In attrition mill, the size reduction is achieved by
  • Shear
  • Compression
  • Shear and compression
  • Impact
Answer: C
11.Separation of cleaned products into various quality fractions based on quality parameters
like size, shape, density, texture or colour is called _____________
Answer: Sorting / Sifting
12.Standard screens are used to measure particle size ranges in between ___________.
Answer: 76 mm to 36μm
13.Angle of inclination of air screen cleaner usually varies in between_________ degrees
Answer: 4-12
14.The law applicable in size reduction of fine powders is ________.
Answer: Rittingers law
15.The differential speed of sigmoid blades in a kneaders are generally in the ratio
of__________.
Answer: 3:2
16.The type of screen which has horizontal plane motion, which is circular at feed end and
reciprocating at discharge end is called ___________
Answer: Gyratory screens
17.The ratio of surface energy created by crushing to the energy absorbed by the solid is
referred as ________________________
Answer: Crushing efficiency
18.The term _____________ indicates the uniformity of grind in resultant product
Answer: Fineness moduless
19.The velocity at which a particle remains in a suspended state in vertical pipe is
called_________
Answer: Terminal velocity.
20.Power requirement for size reduction in terms of work index is___________
Answer: