# Theory of Machines MCQ Question with Answer

## Theory of Machines MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 1
The type of gears used to connect two non parallel and non intersecting shafts is

Spur gear
Helical gear
Bevel gear
Spiral gear

Question No : 2
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

m.ω².r sinθ
m.ω².r cosθ
m.ω².r (sin 2θ/n)
m.ω².r (cos 2θ/n)

Question No : 3
In order to double the period of a simple pendulum, the length of the string should be

Halved
Doubled
None of these

Question No : 4
In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.

Equal to
Directly proportional to
Inversely proportional to
Independent of

Question No : 5
The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)

m/(m + M)
M/(m + M)
(m + M)/m
(m + M)/M

Question No : 6
Which of the following mechanism is an approximate straight line motion mechanism?

Watt's mechanism
Grasshopper mechanism
Robert's mechanism
All of these

Question No : 7
The height of a Watt's governor is

Directly proportional to speed
Directly proportional to (speed)²
Inversely proportional to speed
Inversely proportional to (speed)²