Mechanical Operations Questions and Answers – Materials of Construction

This set of Mechanical Operations Multiple Choice Questions & Answers (MCQs) focuses on “Materials Of Construction”.

1. _____are commonly used to control product on a horizontal or inclined conveyor.
a) Magnet
b) Cleated
c) Clamped
d) Stock
View Answer

Answer: b
Explanation: Cleated belt conveyors are commonly used to control product on a horizontal or inclined conveyor, the key attributes for cleated conveyors are the accuracy.

2. What does the below equation represent?

Type of fluidization by criteria of Froude number where Vmf is minimum velocity of flow
a) Froude number
b) Reynold’s number
c) Sherwood number
d) Kick’s number
View Answer

Answer: a
Explanation: The type of fluidization can be predicted by criteria of Froude number, where Vmf is minimum velocity of flow over the whole cross section area.
advertisement
advertisement

3. Fluidization occurs when, Fr is _____
a) 1.5
b) Zero
c) Infinite
d) Unity
View Answer

Answer: d
Explanation: When the Froude number is less than unity, particulate fluidization occurs and at higher values aggregative fluidization takes place.

4. If the particle are small, the flow is ______
a) Transient
b) Laminar
c) Turbulent
d) Eddy
View Answer

Answer: b
Explanation: If the particles is very small, the flow through the channels between the particles will be laminar and pressure drop increases.
Note: Join free Sanfoundry classes at Telegram or Youtube

5. As the velocity increases, pressure drop ____
a) Increases
b) Decreases
c) Is constant
d) Diverted
View Answer

Answer: a
Explanation: As the velocity is gradually increased, the pressure drop increase but the particles do not move and the bed height remains same.

6. At the fluidizing point, pressure gradient _____
a) Falls
b) Increases
c) Is zero
d) Is unity
View Answer

Answer: a
Explanation: At the fluidizing point, the pressure gradient begins to fall because the porosity of the bed increases.
advertisement

7. Minimum fluidization velocity is calculated by _____
a) Reynold’s equation
b) Dom’s equation
c) Crump equation
d) Ergun’s equation
View Answer

Answer: d
Explanation: An equation for the minimum fluidization velocity can be obtained by settling the pressure drop across the bed equal to weight of the bed per unit area.

8. What does the below equation represent?

advertisement

The equation is Ergun’s equation where dependence of minimum fluidization velocity on DP

a) Reynold’s equation
b) Schmidt equation
c) Ergun’s equation
d) Froude’s equation
View Answer

Answer: c
Explanation: The above equation is called as the Ergun’s equation, where the dependence of minimum fluidization velocity on Dp.

9. For low Reynold’s number, the terminal velocity ____
a) Falls
b) Increases
c) Is zero
d) Is unity
View Answer

Answer: a
Explanation: The terminal velocity for individual particles falling in the still air shows that, for low Reynold’s number.

10. The following equation depends upon ______

The ratio of terminal velocity & fluidization velocity depend on void fraction

a) Void fraction
b) Velocity gradient
c) Entropy
d) Enthalpy
View Answer

Answer: a
Explanation: The ratio of the terminal velocity and the fluidization velocity mainly depend mainly on the void fraction at minimum fluidization.

Sanfoundry Global Education & Learning Series – Mechanical Operations.

To practice all areas of Mechanical Operations, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.