theory of machines Mcqs
101. The lower pair is a_____________________?
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A. point contact pair

B. does not exist

C. closed pair

D. open pair

E. sliding pair

102. A chain comprises of 5 links having 5 joints. Is it kinematic chain ?
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A. data are insufficient to determine it

B. unpredictable

C. it is a marginal case

D. no

E. yes

103. Sense of tangential acceleration of a link_________________?
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A. none of the above

B. is opposite to that of velocity

C. could be either same or opposite to velocity

D. is same as that of velocity

E. is perpendicular to that of velocity

104. A foot step bearing and rotor of a vertical turbine form examples of___________________?
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A. none of the above

B. partially constrained motion

C. successfully constrained motion

D. incompletely constrained motion

E. completely constrained motion

105. Rectilinear motion of piston is converted into rotary by_______________?
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A. cross head

B. connecting rod

C. gudgeon pin

D. four bar chain mechanism

E. slider crank
106. The number of links and instantaneous centers in a reciprocating engine mechanism are ___________________?
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A. 4, 6

B. 5, 4

C. 6, 4

D. 4, 5

E. 4, 4

107. Cam angle is defined as the angle_________________?
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A. through which, the cam rotates during the period in which the follower remains in the highest position

B. during which the follower returns to its initial position

C. moved by the can from beginning of i ascent to the termination of descent

D. of rotation of the cam for a definite displacement of the follower

E. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

108. In higher pair, the relative motion is_____________________?
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A. purely turning

B. purely sliding

C. purely rotary

D. purely surface contact

E. combination of sliding and turning
109. The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as__________________?
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A. spherical pair

B. turning pair

C. rolling pair

D. lower pair

E. sliding pair

110. It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by_______________?
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A. knuckle joint

B. Oldhams coupling

C. flexible coupling

D. universal joint

E. electromagnetic coupling

111. In automobiles the power is transmitted from gear box to differential through _________________?
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A. Hookes joint

B. universal joint

C. bevel gear

D. Knuckle joint

E. Oldhams coupling

112. For simple harmonic motion of the of follower, a cosine curve represents___________________?
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A. velocity diagram

B. all of the above

C. displacement diagram

D. none of the above

E. acceleration diagram
113. Lower pairs are those which have___________________?
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A. two elements that permit relative motion

B. surface contact between the two elements when in motion

C. point or line contact between the two elements when in motion

D. none of the above

E. elements of pairs not -held together mechanically

114. Inertia force acts___________________?
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A. along the direction of accel* force

B. none of the above

C. opposite to the direction of ace ing force

D. perpendicular to the accel< force

E. in any direction w.r.t. accel* force depending on the magnit two

115. Cam size depends upon__________________?
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A. prime circle

B. base circle

C. none of the above

D. pitch circle

E. outer circle

116. In S.H.M., acceleration is proportional to _________________?
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A. velocity

B. all of the above

C. displacement

D. rate of change of velocity

E. none of the above

117. The maximum value of the pressure angle in case of cam is kept as________________?
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A. 30

B. 14

C. 20

D. 25.

E. 10

118. The Bifilar suspension method is used to determine__________________?
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A. position of balancing weights

B. moment of inertia

C. centripetal acceleration

D. natural frequency of vibration

E. angular acceleration of a body

119. Two systems shall be dynamically equivalent when____________________?
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A. M.I. of two about an axis through e.g. is equal

B. all of the above

C. e.g. of two coincides

D. the mass of two are same

E. none of the above

120. Kleins construction gives a graphica construction for________________?
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A. acceleration polygon

B. angular acceleration

C. velocity polygon

D. slider-crank mechanism

E. four bar chain mechanism

121. For the same lift and same angle of ascent, a smaller base circle will give_______________?
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A. none of the above is true

B. a small value of pressure angle

C. something else

D. there is no such relation with pressure angle

E. a large value of pressure angle
122. Hart mechanism has________________?
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A. twelve links

B. five links

C. four links

D. eight links

E. six links
123. Polar moment of inertia (IP) of ac disc is to ht determined by suspen by a wire and noting the frequei oscillations (f) ?
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A. Ip oc j

B. Ipocf

C. Ipoc-

D. Ipocf

E. none of the above

124. An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has___________________?
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A. 5 links

B. none of the above

C. 2 links

D. 4 links

E. 3 links

125. In S.H.M., the velocity vector w.r.t. displacement vector _________________?
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A. could be anywhere.

B. are in phase

C. leads by 180

D. lags by 90

E. leads by 90
126. A cam with a roller follower would con stitute following type of pair______________?
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A. close pair

B. cam pair

C. open pair

D. lower pair

E. higher pair
127. Kleins construction is useful to determine__________________?
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A. acceleration of various parts

B. velocity of various parts

C. all of the above

D. angular acceleration of various parts

E. displacement of various parts

128. A circle passing through the pitch point with its center at the center of cam axis is known as___________________?
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A. cam circle

B. prime circle

C. base circle

D. outer circle

E. pitch circle

129. Instantaneous center of rotation of a link in a four bar mechanism lies on _______________?
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A. a point obtained by intersection on extending adjoining links

B. cant occur

C. right side pivot of this link

D. lift side pivot of this link

E. none of the above

130. The absolute acceleration of any point P in a link about center of rotation 0 is___________________?
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A. none of the above

B. perpendicular to PO

C. along PO

D. along OP

E. at 45 to PO

131. The sense of Coriolis component is such that it_________________?
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A. leads the sliding velocity vector by 180

B. is along the sliding velocity vector

C. none of the above

D. lags the sliding velocity vector by 90

E. leads the sliding velocity vector by 90
132. Higher pairs are those which have_________________?
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A. elements of pairs not held together mechanically

B. surface contact between the two ele-ments when in motion

C. point or line contact between the two elements when in motion

D. two elements that permit relative motion

E. none of the above

133. Open pairs are those which have__________________?
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A. elements of pairs not held together mechanically

B. none of the above

C. surface contact between the two ele-ments when in motion

D. point or line contact between the two elements when in motion

E. two elements that permit relative motion

134. In a shaper mechanism, the Coriolis component of acceleration will_______________?
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A. not exist

B. unpredictable

C. none of the above

D. depend on position of crank

E. exist
135. In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is _______________?
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A. none of the above

B. less than sum of other two

C. greater than sum of other two

D. there is no such relationship

E. equal to sum of other two

136. According to Kennedys theorem, if three bodies have plane motions, their instantaneous centers lie on___________________?
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A. a triangle

B. a point

C. a curve

D. a straight line

E. two lines

137. Tangential acceleration direction is_________________?
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A. perpendicular to angular velocity

B. along the angular velocity

C. opposite to angular velocity

D. none of the above

E. may be any one of these
138. In its simplest form, a cam mechanism consists of following number of links___________________?
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A. 4

B. 1

C. 3

D. none

E. 2

139. In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is________________________?
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A. 45 mm

B. none of the above

C. slightly less than 95 mm

D. 95 mm

E. slightly more than 95 mm

140. The number of centers in a crank driven slider crank mechanism are_______________?
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A. 6

B. 2

C. 4

D. may be any number depending upon position of mechanism

E. 0

141. In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links_________________?
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A. will remain same

B. could change or remain unaltered depending oh which link is fixed

C. will change

D. none of the above

E. will not occur

142. The main disadvantage of the sliding pair is that it is_________________?
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A. A. and C. above

B. difficult to manufacture

C. wears rapidly

D. bulky

E. A. and B. above
143. Coriolis component of acceleration exists whenever a point moves along a path that has________________?
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A. linear displacement

B. rotational motion

C. tangential acceleration

D. centripetal acceleration

E. none of the above

144. Cylindrical cams can be classified as_________________?
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A. circular

B. tangent

C. all of the above

D. none of the above

E. reciprocating

145. Kinematic pairs are those which have___________________?
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A. minimum of two instantaneous centres

B. two elements having Coroilis com-ponent

C. all of the above

D. two elements having relative motion

E. two elements held together mechani-cally