Machine Kinematics Multiple Choice Questions on “Chain Drives”.
1. What is the purpose of using steel chains?
a) To avoid slipping
b) To avoid friction
c) To avoid accelerated motion
d) To avoid jerks
Answer: a
Clarification: In belt and rope drives, it is observed that slipping may take place. In order to avoid the issue of slipping, steel chains are being used.
2. The chains are made up of rigid links which are hinged together in order to avoid flexibility for warping around the driving and driven wheels.
a) True
b) False
Answer: b
Clarification: The chains are made up of rigid links which are hinged together in order to provide the necessary flexibility for warping around the the two sets of wheels, i.e. driving and driven wheels.
3. The toothed wheels in chain drives are known as ______
a) Sprockets
b) Sprockers
c) V-belt
d) V- chain
Answer: a
Clarification: The wheels and the chain are subjected to a constraint to move together without slipping and ensures perfect velocity ratio. The toothed wheels are known as sprocket wheels or sprockets.
4. Which of the following is true regarding chain drives?
a) The chain drives may be used when the distance between the shafts is less
b) The production cost of chains is relatively low
c) The chain drive needs low maintenance
d) The chain drive has no velocity fluctuations
Answer: b
Clarification: The chain drives may be used when the distance between the shafts is less. This is an advantage of using a chain drive over belt or rope drives.
5. The distance between hinge centres of two corresponding links is known as _______
a) Pitch
b) Pitch circle diameter
c) Sprocket length
d) Sprocker diameter
Answer: a
Clarification: Pitch ‘p’ of the chain is the linear distance between the hinge centre of a link and the corresponding hinge centre of the adjacent link. It is usually denoted by p.
6. In the figure given below, what the quantity ‘p’ is known as _________
a) Pitch
b) Pitch circle diameter
c) Sprocket length
d) Sprocker diameter
Answer: a
Clarification: In the given figure the quantity p is the Pitch. Pitch of the chain is the distance between the hinge centre of a link and the corresponding hinge centre of the adjacent link.
7. The diameter of the circle on which the hinge centres of the chain lie is known as _______
a) Pitch
b) Pitch circle diameter
c) Sprocket length
d) Sprocker diameter.
Answer: a
Clarification: Pitch circle diameter of the chain sprocket is the diameter of the circle on which the hinge centres of the chain lie, when the chain is wrapped round a sprocket.
8. Pitch of the chain lies on the arc of the pitch circle.
a) True
b) False
Answer: b
Clarification: Since the links of the chain are rigid, therefore pitch of the chain does not lie on the arc of the pitch circle. Thus, the given statement is false.
9. Which of the following chains fall under the category of hoisting and hauling chains?
a) Chain with oval links
b) Closed joint chain
c) Detachable chain
d) Block chain
Answer: a
Clarification: Chains with oval links are used only at low speeds such as in chain hoists and in anchors for marine works. Hence it falls under the above mentioned category.
10. Which of the following chain is used to provide elevation continuosly?
a) Conveyor chains
b) Power transmitting chains
c) Hoisting chains
d) Hauling chains
Answer: a
Clarification: Conveyer chains are are used for elevating and conveying the materials continuously. The conveyor chains are of the following two types : Detachable or hook joint type chain and Closed joint type chain.
11. Which of the following chains are used for transmission of power, when the distance between the centres of shafts is short?
a) Chain with oval links
b) Closed joint chain
c) Detachable chain
d) Block chain
Answer: d
Clarification: Block chains are used for transmission of power, when the distance between the centres of shafts is relatively short. These chains provide efficient lubrication.