Theory Of Machines Set 3

Mechanical Engineering

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This set of Theory of Machines Multiple Choice Questions & Answers (MCQs) focuses on Theory Of Machines Set 3

Q1 | In order to balance the reciprocating masses, the conditions to be satisfied are
  • Primary forces must balance
  • All above conditions must be satisfied
  • Secondary couples must balance
  • Primary couples must balance
  • Secondary forces must balance
Answer: All above conditions must be satisfied
Q2 | A cam profile is the
  • Actual working contour of the cam
  • Profile of path traced by a cam follower
  • Total surface area of the cam
  • Path which the cam follower traces
  • The profile of the path to be traced by the mechanism driven by follower
Answer: Actual working contour of the cam
Q3 | The number of instantaneous centres for a four bar chain mechanism would be
  • 4
  • 6
  • 5
  • 3
  • 2
Answer: 6
Q4 | Which dynamometer will be most suitable for measuring the BHP of an automobile engine?
  • Electrical generator type
  • Rope brake type
  • Prony brake
  • Electrical resistance type
  • Hydraulic
Answer: Hydraulic
Q5 | In case of locomotives, the effect of hammer blow is counteracted by
  • Flanges of the tyres of the wheels
  • Balancing weights
  • Inside section of the rails
  • Dead weight of the engine
  • All of the above
Answer: Dead weight of the engine
Q6 | A 0.5 kg weight attached to a light spring elogates it 7.87 mm. The natural frequency of the system would be in the range
  • 100-175 cpm
  • 300-350 cpm
  • 175-290 cpm
  • 25-50 cpm
  • 50-100 cpm
Answer: 300-350 cpm
Q7 | The secondary critical speed of a shaft occurs at
  • Twice the primary critical speed
  • Occurs only when there are more than 2 rotors on a shaft
  • Four times the primary critical speed
  • If the externam exciting system has a frequency other than the primary critical speed
  • Half the primary critical speed
Answer: Twice the primary critical speed
Q8 | Which of the following instruments may be used in vibration measurements?
  • Photometer
  • Accelerometer
  • Dynamometer
  • Balometer
  • None of the above
Answer: Accelerometer
Q9 | In locomotives the unbalanced part of the primary disturbing force due to reciprocating masses, cause
  • Variation of tractive effect
  • Periodical vibrations
  • Lifting of locomotive
  • Oscillation in vertical planes
  • Hammer blow
Answer: Variation of tractive effect
Q10 | The 'crowning' of flat pulleys is generally done pulley
  • To reduce belt friction
  • To prevent belt joining from damaging the belt surface
  • To prevent the belt from running off the pulley
  • In case of cross belt drives only
  • None of the above
Answer: To prevent the belt from running off the pulley
Q11 | V belt having cross-section A is suitable for usual load of 5 HP. If 15 HP load is to be transmitted
  • Toothed belts may be used
  • 3 Vee belts using 3 groove pulley may be used
  • Machine arrangement may be modified
  • Drive system may be changed
  • Gear system may be adopted
Answer: 3 Vee belts using 3 groove pulley may be used
Q12 | The efficiency in case of worm gear drives is generally in the range
  • 70-85 percent
  • 50-70 percent
  • 10-25 percent
  • 25-40 percent
  • 40 - 60 percent
Answer: 70-85 percent
Q13 | Two shafts have their axes not in the same straight line. Also their axes are not parallel but intersecting. Which of the following coupling can be used for these shafts?
  • Flexible coupling
  • Universal coupling
  • Oldham's coupling
  • Rigid coupling
  • Any of the above
Answer: Universal coupling
Q14 | Coriolis component is not involved in
  • Andreau variable stroke engine mechanism
  • Slider crank mechanism
  • Line sliding in a swivelling pin
  • Quick return mechanism
  • Tangent cam acceleration
Answer: Slider crank mechanism
Q15 | Idler pulley is used for
  • Maintaining belt tension
  • Changing direction of rotation
  • For stopping motion frequently
  • For running during idling periods only
  • None of the above
Answer: Maintaining belt tension
Q16 | Contact ratio of gear should be
  • One
  • More than one
  • Less than one
  • Not defined
  • None of the above
Answer: Not defined
Q17 | The number of nodes in a shaft carrying three rotors will be
  • Three
  • Zero
  • Four
  • Two
  • One
Answer: Two
Q18 | By using large thread angles in a lifting machine
  • The mechanical advantage will be low
  • The mechanical advantage will be high
  • The load will be sustained in absence of effort
  • The load will be easily lifted
  • While unloading, little effort will be required
Answer: The mechanical advantage will be low
Q19 | The throw of a cam is the maximum distance of the follower from
  • Starting to finish
  • Inner most circle
  • Root circle
  • Pitch circle
  • Base circle
Answer: Base circle
Q20 | The number of degrees of feeedom for a vibrating beam will be
  • Nil
  • Four
  • Two
  • Five
  • One
Answer: Two
Q21 | Which of the following is a lower pair?
  • Piston and cylinder
  • Cam and follower
  • Belt drive
  • Gear
  • None of the above
Answer: Piston and cylinder
Q22 | Which of the following is a dead weight governor?
  • Porter governer
  • Hartness governer
  • Watt governor
  • None of the above
  • None of the above
Answer: Porter governer
Q23 | The mechanism used in a petrol engine is
  • Crank mechanism
  • Slider mechanism
  • Slider crank mechanism
  • Natural line and circular mechanism
  • None of the above
Answer: Slider crank mechanism
Q24 | In the Crossby engine indicator which one of the following mechanism is used?
  • Slider-crank mechanism
  • Scotch yoke mechanism
  • Scotch yoke mechanism
  • Modified pantograph mechanism
  • None of the above
Answer: Scotch yoke mechanism
Answer: Scotch yoke mechanism
Q25 | Timing belt
  • Have no slip
  • Have maximum slip during starting
  • Slip in proportion to the time of operation
  • Are used to determine the life time of a belt
  • None of the above
Answer: Have no slip
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