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

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

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

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

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
d) Idler spacing

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

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

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

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

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