331. Two pulleys of radii r1 and r2 and at distance x apart are connected by means of a cross belt drive. The length of the belt is
✅ The correct answer is option A.
Theory of machines MCQs
332. The angle of the inclined plane at which the body just begins to slide down the plane, is called helix angle.
Right
Wrong
✅ The correct answer is option B.
333. When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than
0.25
0.5
1
2
✅ The correct answer is option D.
334. The distance between the centre of suspension and centre of percussion is equal to the equivalent length of a simple pendulum.
Agree
Disagree
✅ The correct answer is option A.
335. Which of the following is an inversion of a single slider crank chain?
Pendulum pump
Oscillating cylinder engine
Rotary internal combustion engine
all of these
✅ The correct answer is option D.
336. When a point moves along a straight line, its acceleration will have
radial component only
tangential component only
coriolis component only
radial and tangential
✅ The correct answer is option B.
337. The inversion of a mechanism is
changing of a higher pair to a lower pair
turning its upside down
obtained by fixing different links in a kinematic chain
obtained by reversing
✅ The correct answer is option C.
338. In gears, interference takes place when
the tip of a tooth of a mating gear digs into the portion between base and root circles
gears do not move smoothly in the absence of lubrication
pitch of the gears is not same
gear teeth are undercu
✅ The correct answer is option A.
339. In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.
Yes
No
✅ The correct answer is option B.
340. The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)
ω2 x OQ
ω2 x OQ sin θ
ω2 x OQ cos θ
ω2 x OQ tan θ
✅ The correct answer is option A.