Engineering Questions with Answers - Multiple Choice Questions
Mechanical Operations MCQ’s – Equipments
1 - Question
For the transportation of the ultrafine particles the equipment used is a _____ conveyor.
a) Belt
b) Screw
c) Pneumatic
d) Apron
View Answer
Answer: c
Explanation: For a pneumatic the size of particles allowed is 1 micrometer, for example paint pigments, dirt, fogs.
2 - Question
Which of the following filter may prove unsuitable for filtering volatile liquid?
a) Pressure
b) Gravity
c) Vacuum
d) Centrifugal
View Answer
Answer: c
Explanation: Volatile liquid are tend to evaporate in such conditions pressure filter may be best option to use than the vacuum filter.
3 - Question
Helical screw agitator is used for _________
a) Mixing highly viscous paste
b) Blending immiscible liquid
c) Mixing liquids at very high temperature
d) Mixing solids
View Answer
Answer: a
Explanation: Helical screw agitator is used for mixing highly viscous pastes, due to the structure of the blade which is heical
4 - Question
A propeller agitator ____________
a) Produces mainly axial flow
b) Used for mixing high viscous pastes
c) Runs at slow speed
d) Used for low viscous fluids
View Answer
Answer: a
Explanation: A propeller agitator produces mainly axial flow as the shaft is set at an angle of less than 90 degrees to the horizontal.
5 - Question
Highly viscous liquids and pastes, are agitated by ________
a) Propellers
b) Turbine agitators
c) Multiple blade paddles
d) Blenders
View Answer
Answer: c
Explanation: As the operation involves material like pastes and viscous things, normal mixing cannot be preached as they stick to material and can give less efficiency.
6 - Question
Float and sink test determines the possibility of cleaning of coal by a process based on the ___________
a) Gravity separation
b) Wet ability
c) Particle shape
d) Size
View Answer
Answer: a
Explanation: The coal which has the best properties will float on the layer of water, whereas which contains other minerals will sink at bottom.
7 - Question
Colloidal mills are used for _________ grinding.
a) Course
b) Fine
c) Intermediate
d) Ultrafine
View Answer
Answer: d
Explanation: The best mixing for ultrafine particles can be achieved in colloidal mills having range of particles from less than 10 micrometer.
8 - Question
Which of the following conveyors cannot be recommended for transportation of abrasive material?
a) Belt
b) Apron
c) Flight
d) Chain
View Answer
Answer: c
Explanation: Abrasive material are tend to chip and tear during the flight conveying process and thus may prove inefficient for the work.
9 - Question
For sizing of the materials, the most suitable equipment is a _________
a) Trammel
b) Grizzly
c) Shaking screen
d) Vibrating screen
View Answer
Answer: d
Explanation: For a basic start process the vibrating screen are the best that can be used, it can separate particles ranging from 10 mm to 500 mm.
10 - Question
Which of the following can be the most effectively used for clarification of lube oil and printing ink?
a) Sparkler filter
b) Precoat filter
c) Disc bowl centrifuge
d) Sharpness super centrifuge
View Answer
Answer: d
Explanation: The super centrifuges operates at a speed of at least 15,000 rpm which are suitable for separation of ultrafine particles.