Idler pulley is used
A. For changing the direction of motion of the belt
B. For applying tension
C. For increasing velocity ratio
D. All of the above
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Sense of tangential acceleration of a link
A. Is same as that of velocity
B. Is opposite to that of velocity
C. Could be either same or opposite to velocity
D. Is perpendicular to that of velocity
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When a point at the end of a link moves with constant angular velocity, its acceleration will have
A. Radial component only
B. Tangential component only
C. Coriolis component only
D. Radial and tangential components both
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When a point moves along a straight line, its acceleration will have
A. Radial component only
B. Tangential component only
C. Coriolis component only
D. Radial and tangential components both
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For a kinematic chain to be considered as mechanism
A. Two links should be fixed
B. One link should be fixed
C. None of the links should be fixed
D. There is no such criterion
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In a simple train of wheels, the velocity ratio __________ the intermediate wheels.
A. Depends upon
B. Is independent of
C. Either A or B
D. None of these
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The power of a Porter governor is equal to
A. ( 1 + 2c c 2 ) ( m + M ) g .h
B. ( 1 + 2c 2 c 2 ) ( m + M ) g .h
C. ( 1 + 2c 3 c 2 ) ( m + M ) g .h
D. ( 1 + 2c 4 c 2 ) ( m + M ) g .h
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According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a
A. Straight line
B. Parabolic curve
C. Triangle
D. Rectangle
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Which gear is used for connecting two coplanar and intersecting shafts?
A. Spur gear
B. Helical gear
C. Bevel gear
D. None of the above
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In the below figure, PC is the connecting rod and OC is the crank making an angle
θ with the line of stroke PO and rotates with uniform angular velocity at
ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.
A. Infinity
B. Zero
C. Any +ve value
D. Any -ve value
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The train value of a gear train is
A. Equal to velocity ratio of a gear train
B. Reciprocal of velocity ratio of a gear train
C. Always greater than unity
D. Always less than unity
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A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is
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To connect two parallel and coplanar shafts the following type of gearing is used
A. Spur gear
B. Bevel gear
C. Spiral gear
D. None of the above
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The example of rolling pair is
A. Bolt and nut
B. Lead screw of a lathe
C. Ball and socket joint
D. Ball bearing and roller bearing
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The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is
A. Along PO
B. Perpendicular to PO
C. At 45° to PO
D. None of the above
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In automobiles the power is transmitted from gear box to differential through
A. Bevel gear
B. Universal joint
C. Hooke's joint
D. Knuckle joint
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The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is
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The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is
A. 2 1 μ Wcosec α ( r 1 + r 2 )
B. 3 2 μ Wcosec α ( r 1 + r 2 )
C. 2 1 μ Wcosec α ( r 1 2 − r 2 2 r 1 3 − r 2 3 )
D. 3 2 μ Wcosec α ( r 1 2 − r 2 2 r 1 3 − r 2 3 )
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In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.
A. Equal to
B. Less than
C. Greater than
D. None of these
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The Coriolis component of acceleration exists whenever a point moves along a path that has
A. Linear displacement
B. Rotational motion
C. Gravitational acceleration
D. Tangential acceleration
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