Engineering Questions with Answers - Multiple Choice Questions

# Mechanical Operations MCQ’s – Energy Utilisation

1 - Question

What is the relation between Kb and Wi?
a) Kb = Wi
b) Kb = √DWi
c) KbWi = √D
d) Kb/Wi = √D

Explanation: The relation between Kb and Wi can be mathematically defined as Kb = √DWi, where D is the diameter size of the particle.

2 - Question

What is the value of x, if Kb = x*Wi?
a) 0.3162
b) 0.666
c) 0.5
d) 0.133

Explanation: As Kb= √(100*10-3 Wi ) = 0.3162*Wi, hence the value of x is 0.3162.

3 - Question

Which of the following is a type of coarse crusher?
a) Rod mill
b) Stamp battery
c) Jaw crusher
d) Dicer

Explanation: The jaw crusher is one of the major type of the coarse crushing equipment, while stamp and rod mill are of the fine crushers category.

4 - Question

Which of the following works principle of compression?
a) Knife cutter
b) Blake jaw crusher
c) Gyratory Crusher
d) Rod mill

Explanation: The jaw crusher works on the principle of the compression, it consists of a pair of jaw between which the feed is crushed.

5 - Question

The stationary and moveable jaw in a jaw crusher are called as ____
a) Cramp and Anvil
b) Moving and Stay
c) Anvil and Swinging
d) Trace and Find

Explanation: In a jaw crusher, the pair of jaw is available where one of the jaw is fixed, called anvil and the other jaw is called as the swinging jaw.

6 - Question

The maximum feed size for jaw crusher is ____
a) 6 feet in diameter
b) 10 feet in diameter
c) 20 feet in diameter
d) 5 feet in diameter

Explanation: The maximum feed size for jaw crusher is 6 feet in diameter and the product size thus obtained is either ¼ or 10 inches of diameter.

7 - Question

The capacity of a jaw crusher is ____
a) 10 to 20 tons/hour
b) 50 to 60 tons/hour
c) 100 to 500 tons/hour
d) 9 to 900 tons/hour

Explanation: The capacity of a jaw crusher is 9 to 900 tons/hour, during this time the jaw open and closes 250 to 400 times per minutes.

8 - Question

In a dodge crusher, the moveable jaw is fixed at _____
a) Bottom
b) Top
c) Right
d) Left

Explanation: A dodge crusher also consist of two jaws, which are moveable and are fixed at the bottom of the crusher body.

9 - Question

Which of the following shows the tendency to choke?
a) Jaw crusher
b) Dodge Crusher
c) Rod mill
d) Gyratory crusher

Explanation: The dodge crusher is the most prone to the tendency of choking and thus is less widely used due to the same reason.

10 - Question

Calculate D. If Kb = 105.6 and Wi = 5?
a) 449.44
b) 500.2
c) 21.12
d) 101.2