Theory Of Machine Question Preview (ID: 51709)


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1. The motion between a pair which takes place in __________ is known as incompletely constrained motion.
a) (A) One direction only
b) B) Two directions only
c) (C) More than one directio
d) (D) None of these

The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
a) (A) (1/2) μ W R
b) (B) (2/3) μ W R
c) (C) (3/4) μ W R
d) (D) μ W R

A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is
a) (A) Kinematically sound
b) (B) Not sound
c) (C) Soundness would depend upon which link is kept fixed
d) D) Data is not sufficient to determine same

The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)
a) (A) sin (θ + φ) + 1/ cos (θ - φ) + 1
b) (B) cos (θ - φ) + 1/ sin (θ + φ) + 1
c) (C) cos (θ + φ) + 1/ cos (θ - φ) + 1
d) (D) cos (θ - φ) + 1/ cos (θ + φ) + 1

If the opposite links of a four bar linkage are equal, the links will always form a
a) (A) Triangle
b) (B) Rectangle
c) (C) Parallelogram
d) (D) Pentagon

The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
a) (A) ωR cosθ
b) (B) ω(R - r₁) cosθ
c) (C) ω(R - r₁) sinθ
d) (D) ωr₁ sinθ

Two systems shall be dynamically equivalent when
a) (A) The mass of two are same
b) (B) C.G. of two coincides
c) (C) M.I. of two about an axis through e.g. is equal
d) (D) All of the above

The motion of a shaft in a circular hole is an example of
a) (A) Completely constrained motion
b) (B) Incompletely constrained motion
c) (C) Successfully constrained motion
d) (D) None of these

A rotary internal combustion engine has __________ cylinders.
a) (A) Four
b) (B) Five
c) (C) Six
d) (D) Seven

A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to
a) (A) Vector sum of radial component and Coriolis component
b) (B) Vector sum of tangential component and Coriolis component
c) (C) Vector sum of radial component and tangential component
d) (D) Vector difference of radial component and tangential component

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