This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Chain Drives”.
1. A chain drive consist of an endless chain wrapped around two sprockets.
a) True
b) False
View Answer
Explanation: This is the basic definition of chain drive.
2. The chain drive is same as gear drive.
a) Yes
b) No, it is intermediate between belt and gear drive
c) It is superior to gear drive
d) It is inferior to gear drive
View Answer
Explanation: Chain drive is intermediate between belt drive and gear drive.
3. Gear drives are preferred over chain drives for long centre distances.
a) Yes
b) No, they require additional idle gears.
c) No idler gears are required
d) None of the listed
View Answer
Explanation: Gear drive will require additional idler gears.
4. Belt drives have compact construction as compared to chain drives.
a) Yes
b) No, chain drives have compact construction
c) Both have same construction
d) Can’t be cited
View Answer
Explanation: Chain drives have overall small dimensions and hence resulting in compact constructions.
5. The maximum achievable efficiency of the chain drives is about 80%.
a) It is about 50%
b) It is about 96-98%
c) It is about 75%
d) It is always <40%
View Answer
Explanation: Maximum achievable efficiency is around 96-98%.
6. Chain drives suffer from wear problems.
a) Yes, chain might leave the sprocket
b) No, there is no wear problem
c) Wear is insignificant in chain drives
d) None of the listed
View Answer
Explanation: Wear increases pitch of the chain which leads to chain leaving the sprocket.
7. For non-parallel shafts, chain drives are highly recommended.
a) True
b) Gear drive is preferred
c) Depends on the transmission ratio
d) Can’t be stated
View Answer
Explanation: Bevel or worm gears can be used in this case. Chain drives isn’t suitable for this application.
8. The velocity of the chain is always constant in case of chain drive.
a) Yes
b) No, it can never be constant
c) It is constant above a particular value
d) Can’t be stated
View Answer
Explanation: Velocity isn’t constant in chain drive which results in non-uniform speed of the driven shaft.
9. Chain drives require little or no maintenance and creates no noise.
a) True
b) False
View Answer
Explanation: Chain drives require lubrication at proper periods and also generates noise.
10. In roller chains, there is sliding friction between roller and sprocket teeth.
a) True
b) False
View Answer
Explanation: Rollers are freely fitted on the bushes and during engagement turn with teeth. This results in rolling friction.
11. In the designation ‘04B’, pitch of the chain is?
a) 12.7mm
b) 6.35mm
c) 4mm
d) None of the mentioned
View Answer
Explanation: Pitch=[04/16]x25.4mm.
12. The designation ‘04B’ is as per ANSI series.
a) Yes
b) No, it is as par British standards
c) One digit is missing
d) None of the listed
View Answer
Explanation: The letter B indicates British Standard Series.
13. Wear ultimately results in ride in of the chain on sprocket teeth.
a) True
b) Ride out
c) Ride up
d) Ride down
View Answer
Explanation: Wear causes ride out of chain.
14. Galling is a stick slip phenomenon.
a) True
b) No, it is only a stick phenomenon
c) No, it is only a slip phenomenon
d) Can’t be stated
View Answer
Explanation: During high tension, welds are formed at the high spot of contacting area which are subsequently broken due to relative motion.
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