Home » Posts filed under Most recently Theory of Machines - Mechanical Engineering Multiple choice Questions and Answers pdf
Showing posts with label Most recently Theory of Machines - Mechanical Engineering Multiple choice Questions and Answers pdf. Show all posts
Showing posts with label Most recently Theory of Machines - Mechanical Engineering Multiple choice Questions and Answers pdf. Show all posts

Tricky Theory of Machines Multiple choice Questions and Answers pdf

136.    Coriolis component is encountered in
(a)    quick return mechanism of sharper
(b)    four bar chain mechanism
(c)    slider crank mechanism
(d)    (a) and (c) above
(e)    all of the above.
Ans: a

137.    Klein's construction gives a graphics construction for
(a)    slider-crank mechanism
(b)    velocity polygon
(c)    acceleration polygon
(d)    four bar chain mechanism
(e)    angular acceleration.
Ans: c

138.    Klein's construction can be used to determine acceleration of various parts when the crank is at
(a)    inner dead center
(b)    outer dead center
(c)    right angles to the link of the stroke
(d)    at 45° to the line of the stroke
(e)    all of the above.
Ans: e

139.    The number of  load centers in a crank driven slider crank mechanism are
(a) 0
(b) 2
(c) 4
(d) 6
(e) may be any number depending upon position of mechanism.
Ans: b

140.    Corioli's component acts
(a)    perpendicular to sliding surfaces
(b)    along sliding surfaces
(c)    somewhere in between above two
(d)    unpredictable
(e)    none of the above.
Ans: a

141.    The sense of Corioli's component is such that it
(a)    leads the sliding velocity vector by 90°
(b)    lags the sliding velocity vector by 90°
(c)    is along the sliding velocity vector
(d)    leads the sliding velocity vector by 180°
(e)    none of the above.
Ans: a

142.    Klein's construction can be used when
(a)     crank has a uniform angular velocity
(b)     crank has non-uniform velocity
(c)    crank has uniform angular acceleration
(d)    crank has uniform angular velocity and angular acceleration
(e)     there is no such criterion.
Ans: a

143.    Klein's construction is useful to determine
(a)    velocity of various parts
(b)    acceleration of various parts
(c)    displacement of various parts
(d)    angular acceleration of various parts
(e)    all of the above.
 Ans: b

144.    A circle passing through the pitch point with its center at the center of cam axis is known as
(a) pitch circle
(b) base circle
(c) prime circle
(d) outer circle
(e) cam circle.
Ans: c

145.    The pressure angle of a cam depends upon
(a)    offset between center lines of cam and follower
(b)    lift of follower
(c)    angle of ascent
(d)    sum of radii of base circle and roller follower
(e)    all of the above.
Ans: e

146.    Cam size depends upon
(a) base circle
(b) pitch circle
(c) prime circle
(d) outer circle
(e) none of the above.
Ans: a

147.    Cylindrical cams can be classified as
(a)     circular
(b)     tangent
(c)    reciprocating
(d)    all of the above
(e)    none of the above.
Ans: e

148.    The maximum value of the pressure angle in case of cam is kept as
(a) 10°
(b) 14°
(c) 20°
(d) 30°
(e) 25°.
Ans: d

149.    For the same lift and same angle of ascent, a smaller base circle will give
(a)    a small value of pressure angle
(b)    a large value of pressure angle
(c)    there is no such relation with pressure angle
(d)    something else
(e)    none of the above is true.
Ans: b

150.    Cam angle is defined as the angle
(a)    during which the follower returns to its initial position
(b)    of rotation of the cam for a definite displacement of the follower
(c)    through which, the cam rotates during the period in which the follower remains in the highest position
(d)    moved by the cam from the instant the follower begins to rise, till it reaches its highest position
(e)    moved by the cam from beginning of i ascent to the termination of descent.
Ans: b

Read More Questions:
Theory of Machines - Mechanical Engineering Part1
Theory of Machines - Mechanical Engineering Part2
Posted by at 04:37:00 No comments:
Labels:

Objective Theory of Machines Questions and Answers pdf

106.    A kinematic chain requires at least
(a)    2 links and 3 turning pairs
(b)    3 links and 4 turning pairs
(c)    4 links and 4 turning pairs
(d)    5 links and 4 turning pairs
(e)    none of the above.
Ans: c

107.    In a darg link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is
(a)    equal to sum of other two
(b)    greater than sum of other two
(c)    less than sum of other two
(d)    there is no such relationship
(e)    none of the above.
Ans: c

108.    The following is the inversion of slider crank chain mechanism
(a)    Whit worth quick return mechanism
(b)    hand pump
(c)    oscillating cylinder engine
(d)    all of the above
(e)    none of the above.
Ans: d

109.    Kinematic pairs are those which have
(a)    two elements held together mechanically
(b)    two elements having relative motion
(c)    two elements having Coroili's component
(d)    minimum of two instantaneous centers
(e)    all of the above.
Ans: b

110    A typewriter mechanism has 7 number of binary joints, six links and none of higher pairs. The mechanism is
(a)    kinematic ally sound
(b)    not sound
(c)    soundness would depend upon which link is kept fixed
(d)    data is not sufficient to determine same
(e) none of the above.
Ans: a

111.    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
(a)    95 mm
(b)    slightly less than 95 mm
(c)    slightly more than 95 mm
(d)    45 mm
(e)    none of the above.
Ans: b

112.    In above example, the minimum length of the coupler will be
(a)    45 mm
(b)    slightly less than 45 mm
(c)    slightly more than 45 mm
(d)    95 mm
(e)    none of the above.
Ans: c

113.    In S.H.M., acceleration is proportional to
(a)    velocity 
(b)    displacement
(c)    rate of change of velocity
(d)     all of the above
(e)     none of the above.
Ans: b

114.    For simple harmonic motion of the of follower, a cosine curve represents
(a)    displacement diagram
(b)    velocity diagram
(c)    acceleration diagram
(d)    all of the above
(e)    none of the above.
Ans: c

115.    In S.H.M., the velocity vector w.r.t. displacement vector
(a) leads by 90°
(b) lags by 90°
(c) leads by 180°
(d) are in phase
(e) could be anywhere.
Ans: a

116.    A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having 40 kg m2. The resultant speed after will be
(a)     90 RPM 
(b)     100 RPM
(c)    80 RPM
(d)    data are insufficient
(e)    none of the above.
Ans: a

117.    Inertia force acts
(a)    perpendicular to the accelerate  force
(b)    along the direction of accelerate force
(c)    opposite to the direction of accelerate force
(d)    in any direction w.r.t. accelerate force depending on the magnet two
(e)    none of the above.
Ans: c

118.    The frequency  of oscillation at compared to earth will be 
(a)    6 times more
(b)    6 times less
(c)    2.44 times more
(d)    2.44 times,less
(e)    36 times less.
Ans: d

119.    Angle of ascent of cam is defined as the angle
(a)    during which the follower returns to its initial position
(b)    of rotation of the cam for a definite displacement of the follower
(c)    through which the cam rotates during the period in which the follower remains in highest position
(d)    moved by the cam from the instant the follower begins to rise, till it reaches its highest position
(e)    moved by the cam from beginning of ascent to the termination of descent.
Ans: d

120.    If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be
(a)    less 
(b)     more
(c)    same
(d)    data are insufficient to determine same
(e)     none of the above.
Ans: a

Read More Questions:
Theory of Machines - Mechanical Engineering Part1
Theory of Machines - Mechanical Engineering Part2
Posted by at 04:35:00 No comments:
Labels:

Theory of Machines Objective type Questions and Answers pdf

91.    A cam mechanism imparts following motion
(a) rotating 
(b) oscillating
(c) reciprocating
(d) all of the above
(e) none of the above.
Ans: d

92.    A cam with a roller follower would con statute following type of pair
(a)     lower pair    
(b)     higher pair
(c)    open pair     
(d)     close pair
(e)     cam pair.
Ans: b

93.    The approximate straight line mechanism is a
(a)    four bar linkage
(b)    6 bar linkage
(c)     8 bar linkage
(d)    3 bar linkage
(e)     5 bar linkage.
Ans: a

94.    Open 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
(e)    none of the above.
Ans: c

95.    Peaucellier mechanism has
(a) eight links    
(b) six links
(c) four links     
(d) twelve links
(e) five links.
Ans: a

96.    Hart mechanism has
(a) eight links    
(b) six links
(c) four links     
(d) twelve links
(e) five links.
Ans: b

97.    A chain comprises of 5 links having 5 joints. Is it kinematic chain ?
(a)     yes 
(b)     no
(c)    it is a marginal case
(d)    data are insufficient to determine it
(e)    unpredictable.
Ans: b

99.    The main disadvantage of the sliding pair is that it is
(a)     bulky 
(b)     wears rapidly
(c)    difficult to manufacture
(d)    (a) and (b) above
(e)    (a) and (c) above.
Ans: d

100.    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
(e)    none of the above.
Ans: b

101.    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
(a) 2 links 
(b) 3 links
(c) 4 links 
(d) 5 links
(e) none of the above.
Ans: c

102.    Whitworth quick return mechanism is obtained by inversion of
(a)    slider crank mechanism
(b)    kinematic chain
(c)    five link mechanism
(d)    roller cam mechanism
(e)    none of the above.
Ans: a

103.    In its simplest form, a cam mechanism consists of following number of links
(a) 1 
(b) 2
(c) 3 
(d) 4
(e) none.
Ans: c

104.    Which of the following mechanisms produces mathematically an exact straight line motion
(a)    Grasshopper mechanism
(b)    Watt mechanism
(c)    Peaucellier's mechanism
(d)    Tchabichiff mechanism
(e)    Ackermann mechanism.
Ans: c

105.    In a mechanism, usually one link is fixed.
If the fixed link is changed in a kinematic chain, then relative motion of other links
(a)    will remain same
(b)    will change
(c)    could change  or remain  unaltered depending oh which link is fixed
(d)    will not occur
(e)    none of the above.
Ans: a

Read More Questions:
Theory of Machines - Mechanical Engineering Part1
Theory of Machines - Mechanical Engineering Part2
Posted by at 04:28:00 No comments:
Labels:

Hiried Theory of Machines Multiple choice Questions and Answers pdf

76.    TJie horse power transmitted by a belt is dependent upon
(a)    tension on tight side of belt
(b)    tension on slack side of belt
(c)    radius of pulley
(d)    speed of pulley
(e)    all of the above.
Ans: e

77.    The locus of a point on a thread unwound from a cylinder will be
(a) a straight line
(b) a circle
(c) involute 
(d) cycloid
(e) helix.
 Ans: c

78.    To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use
(a) spur gear 
(b) spiral gear
(c) bevel gear    
(d) worm gear
(e) crown gear.
Ans: d

79. 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
(e)    maximum and minimum.
Ans: a

80.    Throw of a cam is the maximum distance of the follower from
(a) base circle   
(b) pitch circle
(c) root circle    
(d) prime circle
(e) inner circle.
Ans: a


81.    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
(e)    none of the above.
Ans: a

82.    Which of the following is false statement in respect of differences between machine and structure
(a)    Machines transmit mechanical work, whereas structures transmit forces
(b)    In machines, relative motion exists be-tween its members, whereas same does hot exist in case of structures
(c)    Machines modify movement and work, whereas structures modify forces
(d)    Efficiency of machines as well as structures is below 100%
(e)    Machines are run by electric motors, but structures are not.
Ans: d

83.    If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to
(a) D1/D2 
(b) D2/D1
(C) D1-D2. 
(d) D1
(e) D1+D2.
Ans: d

84.    Typewriter constitutes
(a) machine 
(b) structure
(c) mechanism  
(d) inversion
(e) none of the above.
Ans: c

85.    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
(e)    none of the above.
Ans: b

86.    A point on a link connecting double slider crank chain traces a
(a) straight line  
(b) circle
(c) parabola 
(d) hyperbola
(e) ellipse.
Ans: e

87.    A pantograph is a mechanism with
(a) lower pairs  
(b) higher pairs
(c) rolling pairs 
(d) turning pairs
(e) spherical pairs.
Ans: a

88.    Kinematic 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
(e)     none of the above.
Ans: d

89.    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
(e) trapezoid.
Ans: c

90.    Higher 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
(e)     none of the above.
Ans: a

Read More Questions:
Theory of Machines - Mechanical Engineering Part1
Theory of Machines - Mechanical Engineering Part2
Posted by at 04:27:00 No comments:
Labels:
Subscribe to: Posts (Atom)