Machine Design Set 22

Mechanical Engineering

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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 22

Q1 | The critical pressure of the journal bearing is
  • at which oil film breaks down
  • metal to metal contact begins
  • minimum operating pressure of the bearing
  • none of the above
  • Cast steel
Answer: at which oil film breaks down
Q2 | In a shaft fibre orientation in the direction of prevailing stress can be obtained by
  • Increasing the diameter of threaded portion
  • tumbling
  • casting
  • forging
  • annealing
Answer: forging
Q3 | Wringing fit is common in
  • Automobile wheel rims
  • Ball bearings
  • Roller bearing
  • Piston pins
  • Slip gauges
Answer: Roller bearing
Q4 | Steel balls for ball bearings are manufactured by
  • Turning
  • Casting
  • Pressing
  • Cold heading
  • Rolling
Answer: Cold heading
Q5 | The piston of a double acting reciprocating steam engine is subjected to
  • fully reversed stresses
  • partly reversed stresses
  • repeated stresses
  • none of the above
  • Increasing the diameter of threaded portion
Answer: fully reversed stresses
Q6 | Shear stress theory is applicable to
  • Brittle materials
  • Ductile materials
  • Plastic materials
  • Visco-elastic materials
  • Elastic materials
Answer: Ductile materials
Q7 | In case of a fillet weld, the throat is
  • the hypotenuse of the triangle of the fillet
  • perpendicular distance from the root to the hypotenuse.
  • the smaller side of the triangle of the fillet
  • Increasing the diameter of threaded portion
  • the large side of the triangle of the fillet
Answer: perpendicular distance from the root to the hypotenuse.
Q8 | An involute gear should have minimum of
  • 6 teeth
  • 20 teeth
  • 4 teeth
  • 8 teeth
  • 12 teeth
Answer: 8 teeth
Q9 | The number of degrees of accuracy in case of gears is
  • Ten
  • Twelve
  • Hundred
  • Six
  • One thousand
Answer: Twelve
Q10 | In case the diameter of a shaft is doubled, its torque transmitting capacity will increase by
  • Big ends of connecting rods for I.C. engines
  • 2 times
  • 8 times
  • 16 times
  • 4 times
Answer: 8 times
Q11 | Induction hardening of components in done
  • To increase hardness at the centre
  • To increase the hardness of the core
  • To increase hardness on the surface only
  • To increase hardness uniformly
  • To increase hardness at a spot only
Answer: To increase hardness on the surface only
Q12 | ERW pipes are
  • Elastic reinforced wire
  • Extra reinforcement welded
  • Electrically resistance welded
  • Electrically reinforced and welded
  • None of the above
Answer: Electrically resistance welded
Q13 | A shaft subjected to combined bending and torsion can be designed by the following stress theory
  • Maximum shear stress theory
  • Maximum octahedral stress theory
  • Maximum energy theory
  • Maximum normal stress theory
  • Increasing the diameter of threaded portion
Answer: Maximum shear stress theory
Q14 | A muff type coupling
  • Is a simple type rigid coupling
  • Is a simple type of flexible coupling
  • Is used for coplanar shafts
  • Is used for non-coplanar shafts
  • Non of the above
Answer: Is a simple type rigid coupling
Q15 | In case of a beam at the neutral axis.
  • shear stress is zero and bending stress is maximum
  • shear stress is minimum and bending stress is zero
  • shear stress is minimum and bending stress is maximum
  • Increasing the diameter of threaded portion
  • shear stress is maximum and bending stress is minimum
Answer: shear stress is zero and bending stress is maximum
Q16 | The column bases are mainly subjected to and designed for
  • bearing and tension
  • compression and tension
  • Increasing the diameter of threaded portion
  • bending and compression
  • bearing and compression
Answer: bending and compression
Q17 | Rivets are driven in
  • Either hot or cold condition
  • Hot condition
  • Cold condition
  • Increasing the diameter of threaded portion
Answer: Either hot or cold condition
Q18 | A single ply leather belt running at a belt velocity of 300 ft/min is likely to transmit per inch of width
  • 4.0 HP
  • 1.5 HP
  • 6.0 HP
  • 3.0 HP
  • 5.0 HP
Answer: 4.0 HP
Q19 | The cam angle is
  • The angle subtended by the live portion of the cam for a definite displacement of the follower
  • The angle subtended by live portion of the cam at the cam centre
  • The angle subtended at the cam centre by the protion of the cam during which the follower moves
  • The angle subtended by the cam at the cam centre when the follower dwells
  • None of the above
Answer: The angle subtended by the live portion of the cam for a definite displacement of the follower
Q20 | In case the number of plastic hinges at failure is less than (r+1), where r is the degree of redundancy of the structure then the type of collapse of structure is
  • elastic collapse
  • complete collapse
  • Increasing the diameter of threaded portion
  • partial collapse
  • over complete collapse
Answer: partial collapse
Q21 | A bench vice is provided with
  • Vee threads
  • BSW threads
  • Buttress threads
  • Acme threads
  • None of the above
Answer: Acme threads
Q22 | The web crippling and web buckling may be prevented by
  • increasing the thickness of web and reducing the length of bearing plates
  • reducing the thickness of web as well as the length of bearing plates
  • increasing the thickness of web as well as the length of bearing plates
  • reducing the thickness of web and increasing the length of bearing plates
  • Increasing the diameter of threaded portion
Answer: increasing the thickness of web as well as the length of bearing plates
Q23 | The ratio of the plastic moment capacity to the yeld moment capacity of a rectangular section is
  • 1.25
  • 1.85
  • 1.5
  • Increasing the diameter of threaded portion
  • 1.15
Answer: 1.5
Q24 | The compression formula is valid upto the slenderness ratio of
  • 15
  • 25
  • 30
  • 40
  • 10
Answer: 40
Q25 | The coefficient of friction will be least in case of
  • Leather on metal
  • Asbestos on metal in oil
  • Metal on metal
  • Wood on metal
  • Sintered metal on cast iron in oil
Answer: Sintered metal on cast iron in oil
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