chemical engineering mechanical operations MCQs – Page 4

Practise multiple-choice questions from chemical engineering mechanical operations for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mechanical operations Mcqs

61. Which of the following is not categorised as a mechanical operation?
0

A. Filtration

B. Humidification

C. Agitation

D. Size enlargement

62. Width and speed of a conveyor belt depends upon the ______________ of the material?
0

A. Lump size

B. Bulk density

C. Both A. & B.

D. Neither A. nor B.

63. In filtration, the use of filter aid helps in__________________?
0

A. Accelerating the rate of filtration

B. Enhancing the cake porosity in case of a dense impermeable cake

C. Deplugging the filter medium

D. Reducing the filtration pressure

64. The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ?
0

A. Df/Dp

B. Df Dp

C. Dp/Df

D. None of these

65. Which of the following clay mixing devices is vacuum operated for deairation of clay ?
0

A. Muller-mixer

B. None of these

C. Pug mill

D. Banbury mixer

66. ____________ mills fall in the category of tumbling mills ?
0

A. All A., B. & C.

B. Compartment

C. Ball and pebble

D. Rod and tube

67. Toothed roll crushers achieve size reduction by___________________?
0

A. Tearing (shear) and compression

B. Impact and attrition

C. Both A. & B.

D. Neither A. nor B.

68. For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?
0

A. 1/d

B. d2

C. d

D. ?d

69. Supporting legs of a plate and frame filter is normally made of________________?
0

A. Cast iron

B. Stainless steel

C. High speed steel

D. Wooden plank

70. Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?
0

A. Plate and frame filter press

B. Vacuum filter

C. Batch basket centrifuge

D. Sand bed filter

71. Power consumption during turbulent flow in agitation tank is proportional to the ______________ of the liquid?
0

A. Density

B. Viscosity

C. Thermal conductivity

D. Surface tension

72. Critical Speed (Nc) of a ball mill is given by (where R1 and R2 are radii of ball mill and the ball respectively) ?
0

A. Nc = (1/2?). ?(R1 R2/g)

B. Nc = (1/4?). ?(g/R1 R2)

C. Nc = (1/?). ?(g/R1 R2)

D. Nc = (1/2?). ?(g/R1 R2)

73. Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about________________?
0

A. 5 to 10

B. 1 to 2

C. 2 to 5

D. 10 to 15

74. The energy consumed by a ball mill depends on__________________?
0

A. Its speed

B. Its ball load

C. The density of the material being ground

D. All A., B. and C.

75. General mechanism of size reduction in intermediate and fine grinder is by __________________?
0

A. Compression

B. Compression and tearing

C. Impact and attrition

D. Cutting action

76. 200 mesh screen means 200 openings per_____________________?
0

A. cm

B. cm2

C. inch

D. inch2

77. Length/diameter ratio of a ball mill is __________________ ?
0

A. 1.5

B. 1

C. > 1

D. < 1

78. During the washing of cake_________________?
0

A. Filter medium resistance increases

B. Cake resistance decreases

C. All the resistances are constant

D. Filter medium resistance decreases

79. Two particles are called to be equal settling, if they are having the same ?
0

A. Terminal velocities in the same fluid & in the same field of force

B. Specific gravity

C. None of these

D. Size

80. Grinding efficiency of a ball mill is of the order of _______________ percent?
0

A. 90-95

B. 40-50

C. 75-80

D. 1-5

Previous Next

Showing 61 to 80 of 445 mcqs