351. An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called
addendum circle
dedendum circle
pitch circle
clearance circle
✅ The correct answer is option C.
Theory of machines MCQs
352. The primary unbalanced force of reciprocating masses is inversely proportional to the crank radius.
Yes
No
✅ The correct answer is option B.
353. In a reciprocating engine, usually __________ of the reciprocating masses are balanced.
one-half
two-third
three-fourth
whole
✅ The correct answer is option B.
354. The ratio of the pitch circle diameter in millimetres to the number of teeth, is called circular pitch.
Yes
No
✅ The correct answer is option B.
355. The factional torque for square thread at the mean radius r while raising load W is given by
T = W.r tan(φ – α)
T = W.r tan(φ + α)
T = W.r tan α
T = W.r tan φ
✅ The correct answer is option B.
356. Sensitiveness of the governor is defined as the ratio of the
mean speed to the maximum equilibrium speed
mean speed to the minimum equilibrium speed
difference of the maximum and minimum equilibrium speeds to the mean speed
sum of the maximum and
✅ The correct answer is option C.
357. A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is
ωv
2 ωv
ω2v
2 ωv2
✅ The correct answer is option B.
358. When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.
remains constant
decreases
increases
✅ The correct answer is option B.
359. The relation between number of links (l) and number of joints (j) in a kinematic chain is
l = (j + 2)
l = (j + 2)
l = (j + 3)
l = j + 4
✅ The correct answer is option B.
360. The height of a Watt’s governor is
directly proportional to speed
directly proportional to (speed)2
inversely proportional to speed
inversely proportional
✅ The correct answer is option D.