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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