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This set of Theory of Machines Multiple Choice Questions & Answers (MCQs) focuses on Theory Of Machines Set 5
Q1 | In case of V-belts
- Belts should not touch the bottom of groove in pulley
- Belts should touch the bottom of groove in pulley
- Grooves in pulley are generally wider than the belt
- Tension in belt remains constant throughout
- The efficiency of transmission is less
Q2 | According to the law of gearing
- Clearance should be minimum 0.15 mm
- Teeth should be cycloidal type
- Common normal at the point of contact always passes through a fixed point (pitch point) on the line joining the centres of rotation
- The gears whould be cut with the cutter having same module
- Teeth should be involute type
Q3 | In a V-belt having B section may be used when the load to be transmitted is
- 60-75 HP
- 3 to 20 HP
- 30-60 HP
- 75-90 HP
- 100 HP
Q4 | A slider crank chain consists of
- One turning and two sliding pairs
- Two turning and one sliding pair
- Three turning and one sliding pairs
- One turning and one sliding pair
- Two turning and two aliding pairs
Q5 | In case of reciprocating engines the primary forces
- Are fully balanced
- Remain unbalanced
- Are partially balanced
- Cannot be balanced
- None of the above
Q6 | Which one of the following is a transmission type dynamometer?
- Prony brake
- Rope brake
- Hydraulic dynamometer
- Electric generator types
- None of the above
Q7 | In case of gears the addendum is given by
- 1.57 x module
- 1.25 x module
- ?/circular pitch
- 2.157/module
- One module
Q8 | The rectilinear motion of a piston is converted into rotary motion by
- Cross-head
- Piston pin
- Connecting rod
- Crank
- Piston rod
Q9 | In case of gears the pressure angle is
- The angle between the line of action and the common tangent to the pitch surface in the plane of rotation
- The angle between the normal to the point of contact and the shaft axis
- The angle between the normal to dedendum at the path point and tangent to the dedendum at the path point and tangent to the dedendum at the same point
- The angle of obliquity between the tangent drawn at the point of contact of the two mating gears
- None of the above
Q10 | A swinging pendulum in its mid-position possesses
- only the potential energy
- only the kinetic energy
- more kinetic energy and less potential energy
- None of the above
- None of the above
Q11 | When the two elements of a pair are kept in contact with the help of a spring, the pair is known as
- A lower pair
- a higher pair
- a closed pair
- an unclosed pair
- None of the above
Q12 | Which one of the following is a higher pair?
- Tooth gearing mechanism
- Thomoson indicator mechanism
- Crossby indicator mechanism
- Double McInnes Indicator mechanism
- Hart's straight line mechanism
Q13 | The difference between a machine and a structure is
- The machine serves to modify and transmit forces only whereas structures serve to modify and transmit mechanical work
- The machine serves to modify and transmit mechanical work whereas structures serve to modify and transmit forces only
- The relative motion exists between the parts of a structures whereas it does not exist in machines
- Structures are temporary constructions whereas machines are paramanent
- None of the above
Q14 | In case of lower pairs
- There is surface contact between the two elements while in the motion
- There is line contact between the two elements while in the motion
- There is point contact between the two elements while is motion
- The contact is only at lower end of the two elements while in motion
- None of the above
Q15 | A 0.5 kg weight attached to a light spring elongates it 0.6 mm. The natural frequency of the system should be approximately
- 6 Hz
- 26 Hz
- 36 Hz
- 32 Hz
- 16 Hz
Q16 | A piston and cylinder in a slider crank mechanism form a
- Sliding pair
- Rolling pair
- Cylindrical pair
- Sliding pair
- Turning pair
Q17 | In case of reciprocating engine mechanism
- The primary and secondary forces have same direction
- The primary and secondary forces have same amplitude
- The ratio of magnitude of primary forces of secondary forces is 2
- The primary force has twoce the frequency of secondary force
- None of the above
Q18 | At node of the shaft
- The vibrations are inimum
- The vibrations are maximum
- The vibrations are average
- The vibrations are zero
- None of the above
Q19 | In a well greased ball bearing the coefficient of friction may be in the range
- 0.45 to 0.60
- 0.25 to 0.45
- 0.60 to 0.70
- 0.70 to 0.80
- 0.1 to 0.25
Q20 | A vibrating system with unity as damping factor will be
- Free from vibrations
- Damped to 1% of critical speed
- Damped to safe limits
- Partly damped
- Critically damped
Q21 | In case of spur gears the flank of the tooth is
- The surface of the top of the tooth
- The part of the tooth surface lying below the pitch surface
- The curve forming face and flank
- Radius that connects in the root circle to the profile of the tooth
- The width of the gear tooth measured axially along the pitch surface
Q22 | The number of links in a pantograph is equal to
- 3
- 4
- 5
- 7
- 6
Q23 | Module is expressed in
- mm
- mm/mm
- mm/No. of teeth
- Dimensionless
- None of the above
Q24 | In case of an elliptical trammel
- One pair turns and three pairs slide
- All four pairs slide
- Three pairs turn and one pair slides
- All four pairs turn
- Two pairs turn and two pairs slide
Q25 | Creep in belts is due to
- Plasticity of belt material
- Elasticity of belt material
- Plastic deformation of belt material due to constant use
- Differential elougation of belt due to difference in tension on two sides of a pulley
- Elongation of belt due to tension