Machine Design Set 6

Mechanical Engineering

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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 6

Q1 | A V-belt having B section is generally used when the power to be transmitted is in the range
  • 25-35 HP
  • 35-50 HP
  • 50-75 HP
  • 75-100 HP
  • 3-25 HP
Answer: 3-25 HP
Q2 | In which of the following gears the lowest degree of accuracy can be expected
  • Machine tools
  • Aeroplane gears
  • Farm machinery
  • Automobile gears
  • Reduction gears for turbines
Answer: Farm machinery
Q3 | Induction motors are generally provided with
  • Mitchel's thrust bearings
  • Sleeve bearings
  • Ball or roller bearings
  • Magnetic bearings
  • Bush bearings
Answer: Ball or roller bearings
Q4 | Which of the following gears are free from axial thrust?
  • Worm gears
  • Spiral gears
  • Helical gears
  • Bevel gears
  • Herringbone gears
Answer: Herringbone gears
Q5 | The phenomenon of eloggation and contraction of the belt is known as
  • Plasticity
  • Creep
  • Fatigue
  • Elasticity
  • Slip
Answer: Creep
Q6 | Rankine theory is applied to
  • bruite materials
  • Increasing the diameter of threaded portion
  • plastic materials
  • tough materials
  • ductile materials
Answer: bruite materials
Q7 | The clamping nut of the turn buckle has
  • Left hand threads
  • Right hand threads
  • Right hand threads on one side and left hand threads on the other side
  • Has no threads
  • None of the above
Answer: Right hand threads on one side and left hand threads on the other side
Q8 | Helical springs are not subjected to
  • Torsional shear stress
  • Transverse shear stress
  • Deflection
  • Hoop stress
  • Force
Answer: Hoop stress
Q9 | The uniform rate of descent is maintained by a brake on the drum which applies the necessary torque of 300 kg-m what additional brake torque is required to bring the system to rest in 0.50 second?
  • 6235 N-m
  • 1027 N-m
  • 2054 N-m
  • 1580 N-m
  • Increasing the diameter of threaded portion
Answer: 2054 N-m
Q10 | The part of the tooth which lies between the pitch and dedendum circle is known as
  • Base
  • Face
  • Profile
  • Root
  • Flank
Answer: Flank
Q11 | Total strain energy theory for the failure of a material at elastic limit is also known as
  • Increasing the diameter of threaded portion
  • Von mises theory
  • Rankine's theory
  • Haig's theory
  • Gust's or Treasca's theory
Answer: Von mises theory
Q12 | A solid shaft of 100 mm diameter transmits 100 HP at (450/?) r.p.m. The torque in kg-m on the shaft would be
  • 250
  • 375
  • 500
  • 990
  • 750
Answer: 500
Q13 | Stone crusher rolls are generally made of
  • Mild steel
  • Grey iron
  • Cast iron
  • Cast steel
  • High carbon steel
Answer: High carbon steel
Q14 | The 'crowning' of flat pulleys is generally done
  • To rduce the belt friction
  • To prevent belt joint 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
Q15 | Piston rings are usually made of
  • Stainless steel
  • Cast iron
  • Increasing the diameter of threaded portion
  • Aluminium
  • High carban steel
Answer: Cast iron
Q16 | The main difference between rigid and flexible coupling for shafts transmitting power is
  • the number of coupling bolts are more in flexible coupling than in rigid coupling
  • a flexible element is inserted around coupling bolts in one of the flanges
  • There is a protective flange over bolts in the case of flexible coupling
  • none of the above
  • Cast steel
Answer: a flexible element is inserted around coupling bolts in one of the flanges
Q17 | Teflon is used for bearings
  • When low coefficient of friction is desired
  • Heat dissipation is a problem
  • Space is the major consideration
  • Increasing the diameter of threaded portion
  • When bearings operate at very high rpm
Answer: When low coefficient of friction is desired
Q18 | In case of a Saddle key
  • The key is welded to shaft
  • The key way is cut in shaft only
  • The key ways is cut in hub only
  • The key way is cut in both shaft and hub
  • The key is made of flexible material
Answer: The key ways is cut in hub only
Q19 | For determination of allowable stress in axial compression, IS : 800-1962 has adopted
  • Euler's formula
  • Secant formula
  • Increasing the diameter of threaded portion
  • Perry Robertson formula
  • Rankines formula
Answer: Secant formula
Q20 | Braking system on earth moving machinery is
  • Vacuum braking
  • Pneumatic braking
  • Hydraulic braking
  • Regenerative braking
  • Mechanical braking
Answer: Hydraulic braking
Q21 | In a butt welded joint, the size of weld is
  • 0.5 times the throat of weld
  • double the throat of weld
  • Increasing the diameter of threaded portion
  • equal to the throat of weld
Answer: 0.5 times the throat of weld
Q22 | The shape factor of an isosceles triangle for bending about the axis parallel to the base is
  • 2.74
  • Increasing the diameter of threaded portion
  • 2.34
  • 1.44
  • 1.74
Answer: 2.34
Q23 | A pivoted segment type thrust bearing is used in order to provide
  • Uniform wear
  • A converging film of oil
  • Balanced lead
  • Uniform frictional forces
  • Uniform velocity
Answer: A converging film of oil
Q24 | The pitch of threads on a lock-nut is
  • Fine
  • Very fine
  • Coarse
  • Same as that of nut
  • None of the above
Answer: Same as that of nut
Q25 | Aircraft body is
  • Welded structure
  • Riveted structure
  • Cast structure
  • Precast structure
  • None of the above
Answer: Riveted structure
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