# Machine Kinematics Questions and Answers – Kinematic Chain

This set of Machine Kinematics Multiple Choice Questions & Answers (MCQs) focuses on “Kinematic Chain”.

1. The relation between the number of links(l) and the number of binary joints(j) for a kinematic chain having constrained motion is given by j = 3/2 (l – 2). If the left hand side of this equation is greater than the right hand side, then the chain is
a) locked chain
b) completely constrained chain
c) successfully constrained chain
d) incompletely constrained chain

Explanation: If the L.H.s. > R.H.S., then the chain is called a locked chain and forms a frame or structure which is used in bridges and trusses.

2. In a kinematic chain, a quaternary joint is equivalent to
a) one binary joint
b) two binary joints
c) three binary joints
d) four binary joints

Explanation: When four links are joined at the same connection, the joint is called a quaternary joint. It is equivalent to three binary joints.

3. A chain consisting of four links and four joints is called a kinematic chain.
a) True
b) False

Explanation: A kinematic chain is defined as a combination of kinematic pairs, joined in such a way that each link forms a part of two pairs and the relative motion between the links or elements is completely or successfully constrained.

4. In a steam engine, the link constitutes a
a) piston, piston rod and cross-head
b) connecting rod with big and small end brasses, caps and bolts
c) crank pin, crankshaft and flywheel
d) all of the mentioned

Explanation: None

5. A mechanism is a assemblage of
c) four or more than four links
d) all of the mentioned

Explanation: When one of the links of a kinematic chain is fixed, the chain is known as mechanism. A simple mechanism consists of minimum four links.

6. A mechanism consisting more than four links is called a compound mechanism.
a) True
b) False

Explanation: A mechanism with four links is known as simple mechanism, and the mechanism with more than four links is known as compound mechanism.

7. A mechanism consisting of four links is called a _____________ mechanism.
a) simple
b) compound
c) inversion
d) none of the mentioned

Explanation: A mechanism with four links is known as simple mechanism, and the mechanism with more than four links is known as compound mechanism.

8. A mechanism ______________ for transmitting or transforming motion.
a) can be used
b) can not be used
c) both of the mentioned
d) none of the mentioned

Explanation: A mechanism is used for transmitting or transforming motion e.g. engine indicators, typewriter etc.

9. When a mechanism is required to transmit power or to do some particular type of work, then it becomes a machine.
a) True
b) False

Explanation: When a mechanism is required to transmit power or to do some particular type of work, then it becomes a machine. In such cases, the various links or elements have to be designed to withstand the forces safely.

10. When one of the links of a kinematic chain is fixed, the chain is known as a
a) structure
b) mechanism
c) inversion
d) machine

Explanation: When one of the links of a kinematic chain is fixed, the chain is known as mechanism. It may be used for transmitting or transforming motion.

Sanfoundry Global Education & Learning Series – Machine Kinematics.
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