remains constant
decreases
increases
✅ The correct answer is option C.
Theory of machines MCQs
412. The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is
μ W cosec α (r1 + r2)
μ W cosec α (r1 + r2)
μ W cosec α
μ W cosec α
✅ The correct answer is option A.
413. The instantaneous centres which vary with the configuration of mechanism, are called
permanent instantaneous centres
fixed instantaneous centres
neither fixed nor permanent instantaneous centres
none of the above
✅ The correct answer is option C.
414. The virtual or equivalent eccentric for the Meyer’s expansion valve is defined as an eccentric having such a length and angle of advance that will cause cut-off to take place at the same position, as is caused by the combined effect of main eccentric and expansion eccentric.
Right
Wrong
✅ The correct answer is option A.
415. A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis
at the origin
below the origin
above the origin
any one of these
✅ The correct answer is option B.
416. The centre of percussion is below the centre of gravity of the body and is at a distance equal to
h/kG
h2/kG
kG2/h
h x kG
✅ The correct answer is option C.
417. A spring controlled governor is said to be unstable when the controlling force
increases as the radius of rotation decreases
increases as the radius of rotation increases
decreases as the radius of rotation increases
remains constant for a
✅ The correct answer is option C.
418. A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a
structure
mechanism
kinematic chain
inversion
✅ The correct answer is option C.
419. When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a
screw pair
spherical pair
turning pair
sliding pair
✅ The correct answer is option A.
420. A Porter governor can not be isochronous.
Agree
Disagree
✅ The correct answer is option A.