Mechanical Operations Questions and Answers – Flow of Filtrate Through Cloth and Cake

This set of Mechanical Operations online quiz focuses on “Flow of Filtrate Through Cloth and Cake”.

1. What does the following represents?
The equation represents Kick’s law where dm/dt across interface of area A
a) Fourier’s law
b) Kick’s law
c) Newton’s law
d) Radiation law
View Answer

Answer: b
Explanation: Where, the rate of transport of mass, dm/dt across an interface of area A is proportional to the concentration gradient, dc/dx, across the interface.

2. As the particle size increases, flow properties also ___
a) Increase
b) Decrease
c) Remain same
d) Constant
View Answer

Answer: a
Explanation: As the particle size increases, flow properties also increases due to the influence of gravitational force on the size.

3. In a ______ the material present in the containers is agitated either by an oscillatory motion.
a) Propeller mixer
b) Shaker mixer
c) Impellor mixer
d) Turbine mixer
View Answer

Answer: b
Explanation: In these mixers, the material present in the containers is agitated either by an oscillatory for small scale mixing or by a rotary movement large scale mixing.
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4. _____ may be used for mixing relatively low viscosity dispersions.
a) Propeller mixer
b) Shaker mixer
c) Impellor mixer
d) Motor mixer
View Answer

Answer: a
Explanation: They are comprising a rotating shaft with propeller blades attached, used for mixing relatively low viscosity dispersions (thicker solutions) and maintaining contents in suspension.

5. At what speed does the propeller mixer rotates?
a) 8000 rpm
b) 7000 rpm
c) 5000 rpm
d) 1000 rpm
View Answer

Answer: a
Explanation: It rotates at a very high speed i.e. up to 8000 r.p.m. due to which mixing is done in a short time, they are much smaller in diameter than paddle and turbine mixers.

6. What viscosity propellers can handle?
a) 2.0 pa.s
b) 1.5 pa.s
c) 5 pa.s
d) 8 pa.s
View Answer

Answer: a
Explanation: Propellers are used when high mixing capacity is needed. These are effective in handling liquids having a viscosity of about 2.0 Pascal second.

7. What are the power requirements of a radial impellor?
a) 50 to 100 hp
b) 1 to 1000 hp
c) 2 to 500 hp
d) 500 to 2000 hp
View Answer

Answer: b
Explanation: Power may range from 1 to 1000 hp, the impellor speed is typically between 50 and 150 rpm but it may be as high as 400 rpm.
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8. The tank diameter to liquid ratio usually is ____
a) 1:1
b) 1:2
c) 2:3
d) 3:4
View Answer

Answer: a
Explanation: Equipment’s such as shaker mixers, propeller mixers, these equipment’s contain a flat bottomed with tank diameter to liquid ratio usually as 1:1.

9. For an impellor, Shearing action is very good at high speed.
a) True
b) False
View Answer

Answer: a
Explanation: It circulates by axial parallel flow to the shaft and its flow pattern is modified by the baffles, which also can cause shearing action at high speeds.
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10. What power requirement’s does an axial impellor requires?
a) = 5 hp
b) > 2 hp
c) < 5 hp
d) > 5 hp
View Answer

Answer: d
Explanation: When a high axial circulation rate is desired, the power consumption is more than 5 horse power.

Sanfoundry Global Education & Learning Series – Mechanical Operations.

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

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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.

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