Machine Design Set 18

Mechanical Engineering

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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 18

Q1 | Treads in tyres are provided to
  • increase tyre grip on the road
  • prevent skidding on dusty roads
  • prevent skidding on wet roads
  • none of the above
  • Cast steel
Answer: prevent skidding on dusty roads
Q2 | An eye bolt is generally provided on
  • Machine tools
  • Cranes
  • Electric motors
  • Automobiles
  • Furnaces
Answer: Electric motors
Q3 | Which cam profile is preferred for minimum jerks?
  • Flat
  • Involute
  • Cycloidal
  • Simple harmonic
  • Any of the above
Answer: Cycloidal
Q4 | For a transverse load on a fillet weld of equal legs, the plane of maximum shear force occurs at
  • 72?
  • 75?
  • 45?
  • 30?
  • 67
Answer: 67
Q5 | The function of a washer is
  • To fill the axial gas
  • To provide cushioning effect
  • To absorb shocks and vibrations
  • To provide bearing area
  • None of the above
Answer: To provide bearing area
Q6 | When it is desired to transmit a high velocity ratio in a limited space, the device used is
  • Worm and worm wheel
  • Bevel gears
  • Helical gears
  • Noone of the above
  • None of the above
Answer: Worm and worm wheel
Q7 | Automobile gears are generally made of
  • carbon chrome manganese steel
  • Phosphor bronze
  • Grade 30 cast iron
  • Malleable cast iron
  • Any of the above
Answer: carbon chrome manganese steel
Q8 | The allowable stresses for the design of steel tanks are adopted
  • 80 percent reduced as given in IS : 800
  • 95 percent reduced as given in IS : 800
  • 50 percent reduced as given in IS : 800
  • Increasing the diameter of threaded portion
  • as given in IS : 800
Answer: 80 percent reduced as given in IS : 800
Q9 | In a steam engine, the valve rod is connected to an eccentric rod by means of
  • universal joint
  • flange coupling
  • cotter joint
  • knuckle joint
  • Increasing the diameter of threaded portion
Answer: knuckle joint
Q10 | While designing a shaft, hub and a key, care is taken so that
  • Key is the weakest component
  • Shaft is the stronger component
  • Key is the strongest component
  • Shaft is the weakest component
  • Hub is the strongest component
Answer: Key is the weakest component
Q11 | If the shearing stress in a nut is equal to half the tensile stress in a bolt then the length of nut should be equal to
  • Diameter of the bolt
  • 1.50 times diameter of the bolt
  • 1.25 times diameter of the bolt
  • 0.75 times the diameter of the bolt
  • 0.5 times diameter of the bolt
Answer: 0.75 times the diameter of the bolt
Q12 | An out-of-plane web distribution is known as
  • column buckling
  • web buckling
  • vertical web buckling
  • any of the above
  • Increasing the diameter of threaded portion
Answer: any of the above
Q13 | Battens in compound steel columns are provided to
  • increase the column capacity
  • ensure unified behaviour
  • prevent buckling
  • Increasing the diameter of threaded portion
  • decrease the buckling in members
Answer: ensure unified behaviour
Q14 | The stability of a structure is ensured if the restoring moment is
  • equal to
  • greater than
  • Increasing the diameter of threaded portion
  • smaller than
Answer: greater than
Q15 | The bending moment at a plastic hinge is
  • equal to zero
  • equal to plastic moment of the section
  • Increasing the diameter of threaded portion
  • equal to yield moment of the section
  • greater than plastic moment of the section
Answer: equal to plastic moment of the section
Q16 | For which of the following gear material the noise level is relatively low?
  • Non-ferrous materials
  • Grade cast iron
  • Non-matallic material
  • Porous materials
  • Alloy steels
Answer: Non-matallic material
Q17 | The assumption of bi-linearly idealised stress-strain relationship for plastic analysis and design is used for
  • steel structures
  • Increasing the diameter of threaded portion
  • prestressed concrete structures
  • reinforced concrete structures
  • aluminium structures
Answer: steel structures
Q18 | V-belt sections generally used in an automobiles are
  • A and B
  • C
  • D
  • E
  • Any one of the above
Answer: A and B
Q19 | The maximum size of the fillet weld that can be applied to the toe of an angle or the round edge should be
  • 1.5 mm less than the thickness of the plate
  • Increasing the diameter of threaded portion
  • equal to the thickness of the plate
  • 0.75 times the thickness of the plate
  • 1.5 mm more than the thickness of the plate
Answer: 0.75 times the thickness of the plate
Q20 | If M 20 coarse pitch is 2.5 mm the mm the fine pitch for the size would be
  • 10 mm
  • 5 mm
  • 2.5 mm
  • 1.5 mm
  • None of the above
Answer: 1.5 mm
Q21 | The units of dynamic viscosity are
  • W/m? K
  • Ns/m2
  • J/kg? K
  • W/m2? K
  • J/?K
Answer: Ns/m2
Q22 | The form coefficient of a spring is
  • Dynamic load carrying capacity
  • It capability to store energy
  • The load/unit drflection
  • Load/spring area
  • Ratio of coil diameter to wire diameter
Answer: It capability to store energy
Q23 | The balls in a ball bearing remain in position
  • Due to centrifugal force
  • In a cage
  • Due to dead load on bearing
  • By lubricant
  • Automatically
Answer: In a cage
Q24 | Which of the following has highest strength to weight ratio?
  • Alloy steel, heat treated
  • Brass
  • Stainless steel
  • Steel piano wire
  • Aluminium, hard rolled
Answer: Steel piano wire
Q25 | Maximum gear ratio in case of single mesh spur gears is expected to be around
  • 150
  • 50
  • 80
  • 10
  • 100
Answer: 10
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