Engineering Questions with Answers - Multiple Choice Questions
Mechanical Operations MCQ’s – Continuous Rotary Filters
1 - Question
From 300 and 10,000, the pattern is in range of _______
a) Transition
b) Laminar
c) Transient
d) Eddy
View Answer
Answer: a
Explanation: In general, below a Reynold’s number of 300, all impellors give viscous flow mixing between 300 and 10,000 the action is turbulent.
2 - Question
_______ is a method of mixing used with deformable plastic.
a) Stumping
b) Threading
c) Kneading
d) Carving
View Answer
Answer: c
Explanation: Kneading is a method of mixing used with deformable plastic, it involves squashing folding it over on itself and squashing again.
3 - Question
A masticator is also called as _______
a) Intensive mixer
b) Preventive mixer
c) Gauge mixer
d) Prang mixer
View Answer
Answer: a
Explanation: A two arm kneader handles suspensions, pastes and light plastic masses, these are often called as intensive mixers.
4 - Question
The desired ratio for kneaders is ________
a) 1.5:1
b) 2:1
c) 3:1
d) 4:1
View Answer
Answer: a
Explanation: The circles of rotation of blades are usually tangential, so that the blades overlap in a desired ratio of 1.5:1.
5 - Question
To achieve successful mixing, the velocities imparted to the liquid are maximized by _______
a) Shafts
b) Impellors
c) Baffles
d) Turbines
View Answer
Answer: c
Explanation: To achieve successful mixing, the radial and longitudinal velocities imparted to the liquid are maximised by baffles, off-centre or angled mixer shafts, or angled blades.
6 - Question
_____ mixing is achieved by creating and recombining fresh surfaces.
a) Efficient
b) Worst
c) Economic
d) Normal
View Answer
Answer: a
Explanation: Efficient mixing is achieved by creating and recombining fresh surfaces in the mixture as often as possible, it is necessary either to move the mixer blades throughout the vessel.
7 - Question
______ are used to avoid buildup of sticky material.
a) Overlapping blades
b) Sigma blades
c) Impellor
d) Propeller
View Answer
Answer: a
Explanation: Overlapping blades are used to avoid the buildup of sticky material on the blades while with tangential blades it is not so.
8 - Question
Which of the following is best for kneading?
a) Sigma
b) Propeller
c) Impellor
d) Agitator
View Answer
Answer: a
Explanation: The common sigma blade is used for general purpose of kneading, it is capable of starting and operating with other solids and liquids.
9 - Question
_____ is used for rough and rubber type materials.
a) Exhausting
b) Multiwipping
c) Seeking
d) Multiscraping
View Answer
Answer: b
Explanation: Multiwipping overlapping blades are used for the mixture which are tough and rubber like, the blade cuts the material into pieces.
10 - Question
What is the range impellor diameter?
a) 30 to 60% of diameter
b) 50 to 80% of diameter
c) 100% of diameter
d) 10 to 30% of diameter
View Answer
Answer: a
Explanation: The impellor diameter is usually between 30 to 60% of the tank diameter, usually with two or four blades they may be high