21. If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be
stable
unstable
isochronous
none of these
✅ The correct answer is option C.
Theory of machines MCQs
22. A rotor supported at A and B carries two masses as shown in the below figure. The rotor is
dynamically balanced
statically balanced
statically and dynamically balanced
not balanced
✅ The correct answer is option C.
23. Balancing of rotating and reciprocating parts of an engine is necessary when it runs at
slow speed
moderate speed
highs peed
any one of these
✅ The correct answer is option C.
24. A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force
the reaction on me inner wheels increases and on the outer wheels decreases
the reaction on the outer wheels increases and on the inner wheels decreases
the reaction on the front wheels increases and on the rear wheels decreases
the reaction on the re
✅ The correct answer is option B.
26. The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.
greater than
less than
✅ The correct answer is option A.
27. Which of the following is a higher pair?
Belt and pulley
Turning pair
Screw pair
Sliding pair
✅ The correct answer is option A.
28. The D-slide valve is also known as
inside admission valve
outside admission valve
piston slide valve
none of these
✅ The correct answer is option B.
29. The coriolis component of acceleration leads the sliding velocity by
45°
90°
135°
180°
✅ The correct answer is option B.
30. In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as
tractive force
swaying couple
hammer blow
none of these
✅ The correct answer is option C.