Theory of Machines Quiz | Theory of Machines MCQs & Answers

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Questions
81 A foot step bearing and rotor of a vertical turbine form examples of
A incompletely constrained motion
B partially constrained motion
C completely constrained motion
D successfully constrained motion

Answer: partially constrained motion
82 Rectangular bar in a rectangular hole is the following type of pair
A completely constrained motion
B partially constrained motion
C incompletely constrained motion
D freely constrained motion

Answer: completely constrained motion
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83 Shaft revolving in a bearing is the following type of pair
A lower pair
B higher pair
C cylindrical pair
D spherical pair

Answer: lower pair
84 To obviate axial thrust, following gear drive is used
A double helical gears having opposite teeth
B double helical gears having identical teeth
C single helical gear in which one of the teeth of helix angle a is more
D mutter gears

Answer: double helical gears having opposite teeth
85 Throw of a cam is the maximum distance of the follower from
A base circle
B root circle
C pitch circle
D prime circle

Answer: base circle
86 For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimidstroke respectively, is
A maximum and zero
B zero and maximum
C minimum and maximum
D zero and minimum

Answer: maximum and zero
87 To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use
A worm gear
B spur gear
C spiral gear
D bevel gear

Answer: worm gear
88 Which of the following is false statement in respect of differences between machine and structure
A Efficiency of machines as well as structures is below 100%
B Machines modify movement and work, whereas structures modify forces
C In machines, relative motion exists be-tween its members, whereas same does hot exist in case of structures
D Machines transmit mechanical work, whereas structures transmit forces

Answer: Efficiency of machines as well as structures is below 100%
89 The approximate straight line mechanism is a
A four bar linkage
B 6 bar linkage
C 8 bar linkage
D 3 bar linkage

Answer: four bar linkage
90 A cam with a roller follower would con stitute following type of pair
A higher pair
B close pair
C lower pair
D cam pair

Answer: higher pair
91 A cam mechanism imparts following motion
A reciprocating
B oscillating
C rotating
D all of the above

Answer: all of the above
92 Higher pairs are those which have
A point or line contact between the two elements when in motion
B surface contact between the two ele-ments when in motion
C elements of pairs not held together mechanically
D two elements that permit relative motion

Answer: point or line contact between the two elements when in motion
93 If the opposite links of a four bar linkage are equal, the links will always form a
A triangle
B rectangle
C parallelogram
D pentagon

Answer: parallelogram
94 Kinematic pairs are those which have
A two elements that permit relative mo-tion
B elements of pairs not held together mechanically
C point or line contact between the two elements when in motion
D surface contact between the two ele-ments when in motion

Answer: two elements that permit relative mo-tion
95 A pantograph is a mechanism with
A lower pairs
B higher pairs
C rolling pairs
D turning pairs

Answer: lower pairs
96 A point on a link connecting double slider crank chain traces a
A ellipse
B hyperbola
C straight line
D circle

Answer: ellipse
97 Lower pairs are those which have
A point or line contact between the two elements when in motion
B surface contact between the two elements when in motion
C elements of pairs not -held together mechanically
D two elements that permit relative motion

Answer: surface contact between the two elements when in motion
98 Typewriter constitutes
A machine
B structure
C mechanism
D inversion

Answer: mechanism
99 Klein’s construction gives a graphica construction for
A slider-crank mechanism
B velocity polygon
C acceleration polygon
D four bar chain mechanism

Answer: acceleration polygon
100 Tangential acceleration direction is
A along the angular velocity
B opposite to angular velocity
C may be any one of these
D perpendicular to angular velocity

Answer: may be any one of these

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