Theory of Machines
JKSSB Junior Engineer (Mechanical) · Theory of Machines and Machine Design · 46 practice questions with answers and explanations: 14 Easy, 32 Medium, 0 Hard.
Sample questions
Sample Easy question 1
A gear train in which the axis of at least one gear itself rotates about another axis is called an:
- epicyclic (planetary) gear train
- compound gear train
- reverted gear train
- simple gear train
Show answer
Answer: A. The arm carries the planet gears around the sun gear.
Sample Easy question 2
A follower whose line of motion passes through the centre of the cam is called a:
- radial follower
- offset follower
- roller follower only
- flat-faced follower only
Show answer
Answer: A. A radial follower has no offset.
Sample Easy question 3
The number of degrees of freedom of a rigid body moving in a plane is:
- 1
- 3
- 2
- 6
Show answer
Answer: B. Two translations and one rotation.
Sample Medium question 4
For a planar mechanism with n links and j simple (full) joints, the Grübler–Kutzbach criterion gives the degrees of freedom as:
- 2(n − 1) − 3j
- 3(n + 1) − 2j
- 3n − 2j
- 3(n − 1) − 2j
Show answer
Answer: D. F = 3(n − 1) − 2j for a planar mechanism with only lower pairs.
Sample Medium question 5
A cam follower moving with uniform velocity during rise has a displacement diagram that is a:
- straight line
- parabola
- cubic curve
- sine curve
Show answer
Answer: A. Constant velocity means displacement increases linearly with time.
Sample Medium question 6
In a simple gear train of two gears, the speed ratio N1 / N2 equals:
- T1 + T2
- T2 / T1
- T1 × T2
- T1 / T2
Show answer
Answer: B. Speeds are inversely proportional to the numbers of teeth.