Theory of Machines

131. Two systems shall be dynamically equivalent when

1. the mass of two are same
2. e.g. of two coincides
3. M.I. of two about an axis through e.g. is equal
4. all of the above
5. none of the above.

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132. Typewriter constitutes

1. machine
2. structure
3. mechanism
4. inversion
5. none of the above.

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133. When a ship travels in a sea, which of the effect is more dangerous

1. steering
2. pitching
3. rolling
4. all of the above
5. none of the above.

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134. Which is the false statement about the properties of instantaneous centre

1. at the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
2. the two rigid links have no linear velocities relative to each other at the instantaneous centre
3. the two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
4. the double centre can be denoted either by 02\ or Ol2, but proper selection should be made
5. none of the above.

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135. Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts

1. theory of machines
2. applied mechanics
3. mechanisms
4. kinetics
5. kinematics.

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136. Which of the following disciplines provides study of relative motion between the parts of a machine

1. theory of machines
2. applied mechanics
3. mechanisms
4. kinetics
5. kinematics.

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137. Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts

1. theory of machines
2. applied mechanics
3. mechanisms
4. kinetics
5. kinematics.

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138. Which of the following has sliding motion

1. crank
2. connecting rod
3. crank pin
4. cross-head
5. cross head guide.

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139. Which of the following is a lower pair

1. ball and socket i
2. piston and cylinder
3. cam and follower
4. (a) and (b) above
5. belt drive.

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140. Which of the following is false statement in respect of differences between machine and structure

1. Machines transmit mechanical work, whereas structures transmit forces
2. In machines, relative motion exists be-tween its members, whereas same does hot exist in case of structures
3. Machines modify movement and work, whereas structures modify forces
4. Efficiency of machines as well as structures is below 100%
5. Machines are run by electric motors, but structures are not.

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