Engineering Questions with Answers - Multiple Choice Questions
Mechanical Operations MCQ’s – Propeller
1 - Question
Wire belts have an operating range of _______
a) 160 to 1416 oC
b) 500 to 600 oC
c) 156 to 800 oC
d) 480 to 1000 oC
View Answer
Answer: a
Explanation: They are mainly used at places where reactions are involved like heat treatment where temperature may vary from 160 to 1416 oC.
2 - Question
Carrying idlers are inclined at an angle of ____
a) 5 to 100
b) 10 to 200
c) 3 to 50
d) 1 to 30
View Answer
Answer: d
Explanation: In order to assist the belt alignment the axis of the outer or wing idlers is inclined at 1 to 30 with the axis of center.
3 - Question
The angle of surcharge lies between ______
a) 50 to 60o
b) 10 to 20o
c) 3 to 5o
d) 5 to 15
View Answer
Answer: d
Explanation: As belts starts running, the heap of material starts slipping, and the angle of repose decreases to the angle of surcharge between 5 to 15o.
4 - Question
What does the following equation represents?
Ffb = μr1 Mc g
a) Belt friction resistance
b) Power requirement
c) Belt tension
d) Idler spacing
View Answer
Answer: a
Explanation: This is the resistance to the movement of empty belt that results mainly from the rolling resistances, here Mc is the total effective mass.
5 - Question
What does the following equation represents?
FfL = μr2 mgl
a) Belt friction resistance
b) Power requirement
c) Load friction resistance
d) Idler spacing
View Answer
Answer: c
Explanation: It is the resistance to horizontal movement of the conveyed material, here m is the mass of conveyed material per unit length.
6 - Question
Which of the following mechanical conveyors does not come under the division carriers?
a) Belt
b) Bucket
c) Screw
d) Apron
View Answer
Answer: c
Explanation: The belt, bucket, and apron are used to carry material from one place to another whereas the screw is used to move things
7 - Question
Filter aid is used to _____________
a) Act as a support base for the septum
b) Decrease the pressure drop
c) Increase the porosity of the cake
d) Increase the rate of filtration
View Answer
Answer: c
Explanation: With the filtration operation, the cake resistance increases to control the resistance filter aids are used to reduce porosity
8 - Question
Filter medium resistance is important during the _______ of filtration.
a) Early stage
b) Final stages
c) Entire process
d) Never in the process
View Answer
Answer: a
Explanation: At early stages the resistance is minimum and thus to maintain the minimum resistance high look up is required.
9 - Question
Fibrous material is broken by________
a) Roll crusher
b) Squirrel cage disintegrator
c) Ball mill
d) Tube mill
View Answer
Answer: b
Explanation: Disintegrators are widely used to operate with fibrous materials such as cotton, wool, and nylon as they can’t be operated in normal mills.
10 - Question
Molten ammonium nitrate is mixed with ground limestone in fertilizer plant in a _____
a) Pug mill
b) Mixer extruder
c) Ban Bury mixer
d) Muller mixer
View Answer
Answer: a
Explanation: A pug mill blend and homogenizes the clay like materials and break up agglomeration as seen in the process of fertilizer plant.