Theory of Machines

ME4I

22438

Multiple Choice Questions (MCQs)

1   Choose correct option related to need of acceleration analysis
    (A)   significant role in development of machine and mechanism
    (B)   forces on the link can be calculated
    (C)   forms basis the basis for stress analysis of mechanism
    (D)   all of the above
[showhide type=”button7c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
2   A SI unit of linear velocity and angular velocity respectively are —–
    (A)   m/sec, rad/sec
    (B)   cm/sec, rad/sec
    (C)   m/sec
    (D)   rad/sec
[showhide type=”button7c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
3   —– is the velocity of point B of link AB, if length of link AB is 35mm and angular velocity is 50 rad/sec
    (A)   1.75 mm/sec
    (B)   1.75 m/sec
    (C)   17.5 m/sec
    (D)   1750 m/sec
[showhide type=”button7c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
4   The velocity of particle with respect to a fixed point is called —–
    (A)   relative velocity
    (B)   absolute velocity
    (C)   relative acceleration
    (D)   angular acceleration
[showhide type=”button7c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
5   The component of acceleration parallel to the link is called —–.
    (A)   Radial
    (B)   Tangential
    (C)   Coriolis
    (D)   Absolute
[showhide type=”button7c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
6   In velocity triangle the “Vco1” indicates
    (A)   Velocity of fixed point O2 w.r.t. C
    (B)   Velocity of fixed point O1 w.r.t. C
    (C)   Velocity of C w.r.t. fixed point O2
    (D)   Velocity of C w.r.t. fixed point O1
[showhide type=”button7c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
7   Velocity of crank in the slider crank mechanism when length of crank is 75mm and crank rotates at 60 r.p.m is —–.
    (A)   0.471 mm/sec
    (B)   4.5 m/sec
    (C)   4500 mm/sec
    (D)   0471 m/sec
[showhide type=”button7c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
8   By dividing the tangential component of acceleration with length of link we get —–.
    (A)   Centripetal acceleration of link
    (B)   Radial acceleration of link
    (C)   Angular acceleration of link
    (D)   above options are incorrect
[showhide type=”button7c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
9   Radial component and tangential components are two components of the acceleration of a particle at any instant will be —–
    (A)   parallel to each other
    (B)   opposite to each other
    (C)   inclined at 45 degrees
    (D)   all above are incorrect
[showhide type=”button7c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
10   Theory of machine is classified as —.
    (A)   Kinematics
    (B)   Statics
    (C)   Kinetics
    (D)   All of above
[showhide type=”button7c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
11   Following are the types of links
    (A)   Rigid
    (B)   Flexible
    (C)   Fluid
    (D)   All of above
[showhide type=”button7c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
12   Following l, s, p and q are the example of —.
    (A)   Binary link
    (B)   Ternary Link
    (C)   Quaternary link
    (D)   None of above
[showhide type=”button7c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
13   Following kinematic chain having total —– number of links
    (A)   2
    (B)   4
    (C)   5
    (D)   6
[showhide type=”button7c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
14   Following mechanism having —– number of ternary joints
    (A)   1
    (B)   2
    (C)   3
    (D)   4
[showhide type=”button7c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
15   Following pair forms —.
    (A)   Lower pair
    (B)   Higher pair
    (C)   Lower as well as higher pair
    (D)   None of the above options
[showhide type=”button7c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
16   Following pair (cam and follower) is an example of —–.
    (A)   Closed pair or self-closed
    (B)   Unclosed pair
    (C)   above two options are incorrect
    (D)   None of the above options
[showhide type=”button7c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
17   Following is an example of —–
    (A)   Completely constrained motion
    (B)   incompletely constrained motion
    (C)   Successfully constrained motion
    (D)   None of above
[showhide type=”button7c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
18   one of the following statements is incorrect
    (A)   Grashoff’s rule states that for a planar crank-rocker 4-bar mechanism, the sum of the shortest and longest link lengths cannot be less than the sum of the remaining two link lengths.
    (B)   Inversions of a mechanism are created by fixing different links of kinematic chain, one at a time.
    (C)   Geneva mechanism is an intermittent motion device.
    (D)   Grubler’s criterion assumes mobility of a planar mechanism to be one.
[showhide type=”button7c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
19   Following of the mechanism is used to convert rotary motion into reciprocating motion
    (A)   Elliptical trammel
    (B)   Geneva mechanism
    (C)   Scotch yoke mechanism
    (D)   Oscillating cylinder engine
[showhide type=”button7c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
20   Following of the option is not an inversion four bar chain mechanism
    (A)   Coupled wheel of locomotive
    (B)   Oldham’s coupling
    (C)   Pantograph
    (D)   Watt straight line indicator mechanism
[showhide type=”button7c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
21   Following is the equation for Grubler’s criterion for plane mechanisms with constrained motion
    (A)   3n-2j1-4=0
    (B)   3n-3j1-4=0
    (C)   3n+2j1+4=0
    (D)   3n+3j1+4=0
[showhide type=”button7c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
22   A chain comprises of 5 links having 5 joints. Is it kinematic chain?
    (A)   it is a kinematic chain
    (B)   it is not a kinematic chain
    (C)   It is a marginal case
    (D)   None of the mentioned
[showhide type=”button7c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
23   Following is the displacement diagram for —–. of follower
    (A)   Uniform velocity
    (B)   SHM
    (C)   Uniform acceleration and retardation
    (D)   sinusoidal
[showhide type=”button7c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
24   Following sentence is not correct related to pitch curve
    (A)   For roller follower pitch curve is greater than base circle by radius of roller of follower
    (B)   For roller follower pitch curve and base circle are same in size
    (C)   For knife edge follower pitch curve and base circle are same in size
    (D)   Given above options are all correct
[showhide type=”button7c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
25   Size of the cam depend on —– of cam
    (A)   Prime circle
    (B)   Pitch circle
    (C)   Base circle
    (D)   All of above
[showhide type=”button7c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
26   Radial Cam in which follower —–
    (A)   In a direction perpendicular to the cam axis
    (B)   In a direction parallel to the cam axis
    (C)   In any direction irrespective of the cam axis
    (D)   Along the cam axis
[showhide type=”button7c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
27   Following is a —– type of follower
    (A)   Translating
    (B)   Reciprocating
    (C)   above two options are incorrect
    (D)   above two options are correct
[showhide type=”button7c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
28   The main limitation of —– cam is that it has to reverse the direction to reset the position of the follower
    (A)   Spiral cam
    (B)   Wedge cam
    (C)   Globoidal cam
    (D)   Spherical cam
[showhide type=”button7c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
29   In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then_____
    (A)   Cross belt drive is preferred
    (B)   Open belt drive is preferred
    (C)   Both of above
    (D)   None of above
[showhide type=”button7c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
30   Two pulleys, one 800 mm diameter and the other 600 mm diameter are mounted on parallel shafts 5 m apart and are connected by a belt drive. Find the length of the belt required for cross belt drive.
    (A)   12.201 m
    (B)   12.397 m
    (C)   12.297 m
    (D)   12.301m
[showhide type=”button7c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
31   Two pulleys of diameters d1 and d2 and at distance x apart are connected by means of an open belt drive. The length of the belt drive is____
    (A)   π/2(d1+d2) +2x(d12-d22)/4x
    (B)   π/2(d1+d2) +2x(d12+d22)/4x
    (C)   π/2(d1-d2) +2x(d12-d22)/4x
    (D)   π/2(d1-d2) +2x(d12+d22)/4x
[showhide type=”button8c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
32   An engine shaft running at 180 r.p.m. is required to drive machine shaft by means of a belt. The pulley on the engine shaft is of 2 meter in dia. and that of machine shaft is 1 meter in dia. Determine the speed of machine shaft.
    (A)   300 r.p.m.
    (B)   320 r.p.m.
    (C)   360 r.p.m.
    (D)   90 r.p.m.
[showhide type=”button8c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
33   When the belt is stationary, it is subjected to some tension, known as initial tension. The value of this tension is equal to the _____
    (A)   tension in the tight side of the belt
    (B)   tension in the slack side of the belt
    (C)   average tension of the tight side and slack side of the belt
    (D)   sum of the tensions in the tight side and slack side of the belt
[showhide type=”button8c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
34   In chain drive, constant velocity ratio is observed to some extent because of _______
    (A)   there is no slip
    (B)   center to center distance between two shafts is short
    (C)   lubrication is provided
    (D)   All of above
[showhide type=”button8c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
35   The number of links of the chain should be always ______
    (A)   Multiple of 3
    (B)   Even
    (C)   Odd
    (D)   None of above
[showhide type=”button8c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
36   Which of the following gears should be recommended for a speed reduction 50:1?
    (A)   Differential
    (B)   Spur
    (C)   Bevel
    (D)   Worm and worm wheel
[showhide type=”button8c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
37   _____ gears are used in a differential of an automobile vehicle.
    (A)   Double helical
    (B)   Spur
    (C)   Helical bevel
    (D)   Bevel
[showhide type=”button8c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
38   According to law of gearing, which sentence is correct of the following.
    (A)   Clearance between mating teeth should be provided
    (B)   Teeth should be of involute type
    (C)   Teeth should be of cycloidal type
    (D)   None of above
[showhide type=”button8c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
39   In simple gear train, if the number of idle gears is even, then the direction of motion of driven gear will be____
    (A)   Same as that driving gear
    (B)   Opposite that of driving gear
    (C)   Depends upon the number of teeth on the driving gear
    (D)   Depends upon the number of teeth on the driven gear
[showhide type=”button8c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
40   In a simple band brake, the angle of contact is 210 degree and coefficient of friction is 0.35. If the brake drum is 180mm in diameter and maximum permissible tension in band is 3200 N, Find Braking torque. if N=460 r.p.m.
    (A)   TB=208.15
    (B)   TB=209.01
    (C)   TB=208.30
    (D)   None of above
[showhide type=”button8c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
41   If x ≤ µ.a, then we can say the condition is ________
    (A)   Self-energizing brake
    (B)   Disc brake
    (C)   Self-locking
    (D)   Drum brake
[showhide type=”button8c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
42   If moment of actuating force and moment of frictional force are acting in the same direction but different in magnitude, then it is known as _______
    (A)   Self-locking brake
    (B)   Drum brake
    (C)   Internal expanding brake
    (D)   Self-energizing
[showhide type=”button8c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
43   Double block or shoe brakes used to reduce _______
    (A)   Unbalanced force on the shaft
    (B)   Vibration of the shaft
    (C)   All of above
    (D)   None of above
[showhide type=”button8c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
44   Hydraulic braking systems works on _______ Principle.
    (A)   Law of energy conservation
    (B)   Law of mass conservation
    (C)   Pascal’s law
    (D)   Newton law
[showhide type=”button8c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
45   If drum rotates in clockwise direction in case of single block brake, braking torque will be __
    (A)   TB=μ p l r / x
    (B)   TB=μ p r s / z
    (C)   TB=μ p l r / z
    (D)   None of above
[showhide type=”button8c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
46   If vehicle is moving on the inclined surface of road in the upward direction, then we can say that, the clutch is _________
    (A)   Disengaged
    (B)   Centrifugal
    (C)   Old
    (D)   Engaged
[showhide type=”button8c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
47   Uniform pressure theory applicable for _________
    (A)   Old clutch
    (B)   Worn out clutch
    (C)   New clutch
    (D)   All of above
[showhide type=”button8c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
48   In diaphragm clutch, a diaphragm spring is used_____
    (A)   To produce required pressure for engagement
    (B)   To replace the coil spring
    (C)   Both of above
    (D)   None of above
[showhide type=”button8c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
49   Which of the following is function of flywheel?
    (A)   Store and release energy during work cycle
    (B)   Reduce power capacity of the electric motor
    (C)   Reduce amplitude of speed fluctuations
    (D)   All of the above
[showhide type=”button8c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
50   In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called
    (A)   Maximum fluctuation of energy
    (B)   Coefficient of fluctuation of energy
    (C)   Fluctuation of energy
    (D)   All of the above
[showhide type=”button8c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
51   Which of the following is not true for cast iron flywheels?
    (A)   Given complex shape
    (B)   Sudden failure
    (C)   Excellent damping
    (D)   Cheap
[showhide type=”button8c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
52   Which device is used to regulate the mean speed of engine, over a duration, during which, load on engine varies?
    (A)   Governors
    (B)   Flywheel
    (C)   Gear
    (D)   Clutches
[showhide type=”button8c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option A [/showhide]
53   Which of the following is a spring-controlled governor?
    (A)   Hartung
    (B)   Hartnell
    (C)   Pickering
    (D)   All of the above
[showhide type=”button8c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option D [/showhide]
54   If speed of the engine fluctuates continuously above and below the mean speed, then a governor is said to be __________.
    (A)   Unstable
    (B)   Hunt
    (C)   Stable
    (D)   Isochronous
[showhide type=”button8c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option B [/showhide]
55   The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is _________
    (A)   0 deg
    (B)   90 deg
    (C)   180 deg
    (D)   360 deg
[showhide type=”button8c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]
56   Two masses A and B are attached to a shaft revolve in the same plane. The masses are 12kg and 10kg and their radii of rotation are 40mm and 50mm respectively. Calculate centrifugal force exerted by each rotating mass on shaft?
    (A)   0.50 kg.m. and 0.6 kg.m.
    (B)   1.08 kg.m. and 45 kg.m.
    (C)   0.48 kg.m. and 0.5 kg.m.
    (D)   0.5 kg.m. and 0.48 kg.m.
[showhide type=”button8c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option C [/showhide]

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