Download PDF
Free download in PDF Theory of Machines MCQs & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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
83
Shaft revolving in a bearing is the following type of pair
[A]
lower pair
[B]
higher pair
[C]
cylindrical pair
[D]
spherical 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
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
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
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
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
91
A cam mechanism imparts following motion
[A]
reciprocating
[B]
oscillating
[C]
rotating
[D]
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
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
96
A point on a link connecting double slider crank chain traces a
[A]
ellipse
[B]
hyperbola
[C]
straight line
[D]
circle
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
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
Take Mock Tests