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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 20

Q1 | Which of the following equipment operates at higher speeds as compared to the remaining?
  • Steam turbines
  • Automobiles
  • Diesel engines
  • Machine tools
  • Fram machinery
Q2 | Flexible shafts are made of
  • thin mild steel rod
  • Increasing the diameter of threaded portion
  • hollow mild steel rod
  • wavy steel wires
Q3 | An automobile gear box has
  • Simple gear train
  • Compound gear train
  • Epicycle gear train
  • Compound epicyclic gear train
  • None of the above
Q4 | Rivets are
  • Heated before inserting in position
  • Heated after inserting in position
  • Not heated at all
  • Cold forged
  • None of the above
Q5 | A starter in automobile is generally
  • Single phase a.c.motor
  • dc shunt motor
  • dc series motor
  • dc compound motor
  • None of the above
Q6 | The holding power of sunk key is due to the resistance it differs in
  • shear and crushing
  • Cast steel
  • crushing only
  • tension only
  • shear only
Q7 | Screw parts with a right hand thread must only be stressed
  • In the direction of screwing in
  • In the direction of screwing out
  • In the direction normal to the screw axis
  • In the shear plane
  • In the plane of principal axis
Q8 | Resilience of material should be considered when it is subjected to
  • Fluctuating load
  • Wear and tear
  • Shock loading
  • Any of the above
  • None of the above
Q9 | Which of the following drive cannot be used for driving cam shaft of a four stroke intemal cambustion engine?
  • Spur gear drive
  • Helical gear drive
  • Chain drive
  • V-belt drive
  • None of the above
Q10 | In an open belt-pulley drive the bodily slip occurs
  • first at larger pulley
  • first at smaller pulley
  • simultaneously on both the pulleys
  • none of the above
  • Cast steel
Q11 | Poisson's ratio for steel is
  • 0.33
  • 0.27
  • 0.1
  • 1
  • None of the above
Q12 | Maximum principal stress theory for the failure of a material at elastic point, is knowns as
  • Von Mises theory
  • Rankines theory
  • Haig's theory
  • Guest's or Tresca's theory
  • Increasing the diameter of threaded portion
Q13 | The maximum thickness of the plates used in pressed steel tanks is
  • Increasing the diameter of threaded portion
  • 3 mm
  • 5 mm
  • 6 mm
  • 4 mm
Q14 | The minor-diameter cross-section of the portion of the screw between the nut and the thrust bearing is subjected to
  • Tension
  • Compression
  • Shear
  • Torque
  • Biaxial stress
Q15 | In case of rolled steel beams, the chear force is resisted by
  • Increasing the diameter of threaded portion
  • flanges only
  • web only
  • web and flanges together
  • top flange only
Q16 | A reverted gear train is one in which
  • The direction of rotation of first and last gear is the same
  • The direction of rotation of first and last gear is opposite
  • The first and last gear are on the same shaft
  • The first and the last gear are essentially on separate but parallel shafts
  • None of the above
Q17 | In an extra humid atmosphere which one of the following motor would you select?
  • Semi-protected
  • Drip proof
  • Totally enclosed fan cooled
  • Open type
  • Fan cooled
Q18 | A Babbitt is
  • A eutcctic of iron and iron phosphide
  • A gadget for measuring volume
  • A measure of magnetic induction produced in a material
  • Antimony bearing lead or tia alloy
  • None of the above
Q19 | Fine scratches assist in librication in
  • thin film lubrication
  • thick film lubrication
  • both (A) and (B) above
  • none of the above
  • Increasing the diameter of threaded portion
Q20 | The ultimate strength design of steel structures makes use of
  • elastic and plastic analysis of structures
  • Increasing the diameter of threaded portion
  • plastic analysis of structures
  • ultimate analysis
  • elastic analysis of structures
Q21 | Which steel will have maximum percentage of carbon?
  • 20 Cr 18 Ni 2
  • 15 Cr 65
  • C 14
  • 40 Cr 40
  • C 15
Q22 | While designing a warm and a worm wheel the sign should be governed by
  • Worm
  • Worm wheel
  • Any one of the two
  • Standards designs should be followed
  • None of the above
Q23 | If the stress at elastic limit is Se, then the modulus of resistance is proportional to
  • (Se)
  • (Se)1/2
  • (Se)2
  • Se
  • (Se)2/2
Q24 | The gears used for non-intersecting perpendicular shafts are
  • Herringbone gears
  • Helical gears
  • Spur gears
  • Hypoid gears
  • Double helical gears
Q25 | Fine thread with 16 mm nominal diameter and 1.5 mm pitch is designed as
  • M 1.5 x 16
  • M 16 x 1.5
  • M 16
  • none of the above
  • Cast steel