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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 7

Q1 | The weakest plane in a fillet weld is
  • the throat
  • smaller of the sides
  • side normal to the force
  • side parallel to the force
  • Increasing the diameter of threaded portion
Q2 | The holes in plates for reveting are usually made by
  • Arc cutting
  • Oxyacetylene flame
  • Punching
  • Drilling
  • Any of the above
Q3 | Which of the following treatment is often recommended for parts operating under corrosive conditions?
  • strain-aging
  • tempering
  • normalising
  • all of the above
  • Increasing the diameter of threaded portion
Q4 | A material is generally classified as brittle if the percentage elongation (in a gauge length of 50 mm) is less than
  • Chrome steel
  • 1%
  • 2%
  • 5%
  • 15%
Q5 | A flange coupling is
  • Used for non-collinear shafts
  • Used for collinear shafts
  • Flexible
  • Used only on small shafts rotating at slow speeds
  • None of the above
Q6 | Splines are used when
  • Axial relative motion between shaft and hub is necessary
  • The torque is high
  • The power to be transmitted is high
  • rpm are high
  • The power to be transmitted is low
Q7 | Bolts in structures are often tightened upto or beyond the yield point because
  • frction is more beyond yield point thus providing a firm joint
  • temperature variations may loosen the joint
  • it improves endurance strength
  • all of the above
  • Increasing the diameter of threaded portion
Q8 | A triple threaded worm has a pitch diameter of 100 mm and an axial pitch of 22 mm. The lead angle will be
  • tan-1 0.21
  • tan-1 0.66
  • tan-1 0.22
  • tan-1 0.3
  • tan-1 0.36
Q9 | Spigot and socket joints are used on pipes
  • Which are buried underground
  • Carrying air at pressure above atmospheric pressure
  • Carrying steam under high pressure
  • Carrying high pressure fluids under high pressure
  • Carrying air at pressure below atmospheric pressure
Q10 | In a compression test the fracture in cast iron specimen would occur along
  • An oblique plane
  • Along the axis of the load
  • At right angles to the specimen axis
  • Fracture will not occur in cast iron
  • None of the above
Q11 | If the allowable shear stress is 960 kg/sq. cm for the size h cm, the allowable force per cm of weld length would be
  • 670 h
  • 475 h
  • 315 h
  • 400 h
  • 950 h
Q12 | In case of a knuckle joint the pin is likely to fail in
  • Tension
  • Crushing
  • Double shear
  • Compression
  • Shear
Q13 | Shot peening leaves the material surface in
  • residual tensile stress
  • residual shear stress
  • residual compressive stress
  • All of the above
  • Increasing the diameter of threaded portion
Q14 | A Babbit is
  • A gadget for measuring volume
  • A measure of magnetic induction produced in a material
  • A eutectic of iron and iron phosphide
  • None of these
  • Antimony bearing lead or tin alloy
Q15 | Low pressure angle on gears results in
  • Weaker teeth
  • stronger teeth
  • abrasive wear
  • none of the above
  • Cast steel
Q16 | An eye bolt is generally provided on
  • Furnaces
  • Bench vices
  • Electric motors
  • Overhead cranes
  • All of the above
Q17 | The satisfactory method of reclaiming worn out and under sized part subject to fatigue loads is
  • Repainting
  • Polishing
  • Electroplating
  • Recasting
  • None of the above
Q18 | The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
  • 1 micron
  • 10 micron
  • 0.01 micron
  • 0.1 micron
  • 100 micron
Q19 | Dead weight type safety valve is not used on locomotives because
  • It is costly
  • It is susceptible to vibratory forces
  • It is not reliable
  • It is bulky
  • It gives bad apparatus
Q20 | Extrafine threaded connections are generally recommended for
  • Increasing the diameter of threaded portion
  • Rolled sections
  • hardened objects
  • thin walled assemblies
  • Tapped hole in castings
Q21 | A square key is
  • Equally strong in shear and compression
  • Very weak in shear
  • Less strong in shear and more strong in compression
  • More strong in shear and less strong in compression
  • Very weak in compression
Q22 | A steel specified as St 50 will have a tensile strength of approximately
  • 50 tonnes/m2
  • 50 kg/mm2
  • 50 kg/cm2
  • 50 tonnes/mm2
  • None of the above
Q23 | The chain used in motor cycles is generally
  • Ewast type
  • Silent type
  • Double roller type
  • Bush roller type
  • Pintle type
Q24 | In gear design, addendum is equal to
  • Cast steel
  • Twice of module
  • One and a half times module
  • Module
  • Half of module
Q25 | Lubricant is not required in
  • Increasing the diameter of threaded portion
  • Electromagnetic bearing
  • Hydrostatic bearings
  • Gas bearings
  • Foil bearing