11. The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called
radial component
tangential component
coriolis component
none of these
✅ The correct answer is option A.
Theory of machines MCQs
12. In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to
log
loge
log(x1.x2)
✅ The correct answer is option B.
13. The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)
ω(r1 – r2)sin θ
ω(r1 + r2)sinθ sec2θ
ω(r1 – r2)cos θ
ω(r1 + r2)cos θ cosec2
✅ The correct answer is option B.
15. In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)
P = W tan(α – φ)
P = W tan(α + φ)
P = W tan(φ – α)
P = W cos(α + φ)
✅ The correct answer is option B.
16. The centre of gravity of a coupler link in a four bar mechanism will experience
no acceleration
only linear acceleration
only angular acceleration
both linear and angula
✅ The correct answer is option D.
17. When the sleeve of a Porter governor moves upwards, the governor speed
increases
decreases
remains unaffected
first increases and th
✅ The correct answer is option A.
18. The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is
equal to 1
less than 2
equal to 2
greater than 2
✅ The correct answer is option D.
19. The coriolis component of acceleration depends upon
velocity of slider
angular velocity of the link
both (a) and (b)
none of these
✅ The correct answer is option C.