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This set of Theory of Machines Multiple Choice Questions & Answers (MCQs) focuses on Theory Of Machines Set 4
Q1 | The speed ratio in case of micro gears is
- Between 1.1 and 5
- More than 10
- Less than 1
- Between 5 and 10
- 1
Q2 | For a rational number for the pitch circle diameter and a rational number of teeth on the wheel, the circular pitch will work out to
- An odd number
- An even number
- A rational number
- An irrational number
- None of the above
Q3 | A swinging field type dynamometer is
- Torsion dynamometer
- Vortex type dynamometer
- Friction dynamometer
- Electrical dynamometer
- Transmission type of dynamometer
Q4 | Forced vibrations
- Are followed by free vibrations
- Are preceded by free vibrations
- Take place at a frequency more than natural frequency
- Are independent of natural frequency
- None of the above
Q5 | A sphere of mass 100 kg moving at 10 m/s overtakes and collides with another sphere of mass 50 kg moving at 3 m/s in the same direction. If the impact is inelastic the velocity of of two masses after impact will be
- 8.33 m/s
- 4.17 m/s
- Zero
- 13.3 m/s
- 6.67 m/s
Q6 | The critical speed of a shaft is affected by
- Diameter of the disc
- Eccentricity
- Span of shaft
- (A) and (B) above
- (A), (B) and (C) above
Q7 | A standard gear cutter No. 3 is marked to cut 35-54 teeth. It implies that
- The cutter is to be replaced after cutting 54 teeth
- The cutter will be suitable for gears having 35 to 54 teeth
- The cutter will be suitable for spur gear teeth cutting only
- The cutter will provide correct profile for any gear having number of teeth in the range 35 to 54
- None of the above
Q8 | A kinematic chain requires minimum of
- 3 links and 3 turning pairs
- 4 links and 4 turning pairs
- 3 links and 4 turning pairs
- 2 links and 3 turning pairs
- 4 links and 5 turning pairs
Q9 | Which type of governor is preferred for gramophones?
- Harting
- Porter
- Hartnell
- Pickering
- Watt
Q10 | An axial flow fan balanced at one speed often exhibits substantial vibrational effects when operated at other speeds, mainly due to
- Unbalanced parts of fan
- Aerodynamic unbalance
- Primary critical speed effect
- Secondary critical speed effect
- Vibration in air
Q11 | In a kinematic chain the minimum number of kinematic pairs required is
- Five
- Three
- Four
- Two
- One
Q12 | Which of the following is a spring controlled governor?
- Harting governor
- Pickering governor
- Hartnell governor
- Wilson hartnell governor
- All of the above
Q13 | The sum of the tensions when the belt is running on the pulley is
- Less than the initial tension
- More than the initial tension
- More than twise the initial tension
- Half the initial tension
- None of the above
Q14 | Klien's construction gives a graphical construction for
- Velocity polygon
- Slider crank mechanism
- Angular accelerations
- Acceleration polygon
- Four bar chain mechanism
Q15 | In order that a belt may not run off the pulley
- It should be properly tightened
- The centre line of the belt as it approaches the pulley must lie in a plane perpendicular to the axis of that pulley
- The belt should be provided with frictional material
- The belt should be provided with a guide
- None of the above
Q16 | The gears are considered to be operating in medium velocity range if their peripheral velocity lies in the range
- 25-50 m/sec
- 3-15 m/sec
- 15-25 m/sec
- 1-3 m/sec
- 50-75 m/sec
Q17 | Motor cycle shock sbsorbers are generally designed for
- Resonant damping
- Light damping
- Large damping
- Critical damping
- Partial damping
Q18 | A point on a link connecting double slider crank chain, traces a
- Circular path
- Hoperbolic path
- Straight line path
- Parabolic path
- Elliptical path
Q19 | Velocity of sliding between two mating gear surfaces can be defined as
- Sum of their angular velocities x distance between pitch point and point of contact.
- Sum of their angular velocities x distance between their centres of rotation.
- Sum of their angular velocities x difference between their pitch circle diameters
- None of these
- None of the above
Q20 | Identify incorrect statement regarding the flywheel, if any
- It is provided to minimise vibration of engine
- It takes care of output fluctuations and controls input accordingly
- It is provided to control engine speed
- All above
- In help in starting engine
Q21 | The number of natural frequencies for three rotor system will be
- Six
- Three
- One
- Four
- Two
Q22 | In case of gears, the interference takes place
- Whenever the forms of the mating teeth are such that contact between them can occur at some place other than along the correct path of contact
- When gears do not move smoothly in absence of lubrication
- When the pitch of the gears is not same
- When the gear teeth are under cut
- None of the above
Q23 | In case of solid friction, when tan ? =
- The body A will move over the surface B irrespective of the magnitude of the force F applied on the body
- tan ? can be equal to
- tan ? can never be equal to
- No motion of body A on surface B is possible, irrespective of how large the magnitude of force F applied on the body may be
- tan ? can be equal to
Q24 | Which of the following is a dead weight type governor?
- Porter governor
- Hartnell governor
- Watt governor
- All of the above
- None of the above
Q25 | Which of the following is not a positive drive?
- Rope drive
- Flat belt drive
- V-belt drive
- All of the above
- None of the above