Machine Design Set 16

Mechanical Engineering

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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 16

Q1 | Forced vibrations
  • Are preceded by free vibrations
  • Are followed by free vibrations
  • Have a frequency more than the natural frequency
  • Are independent of natural frequency
  • None of the above
Answer: Are independent of natural frequency
Q2 | Bearings provided on passenger coaches in railway are
  • Bush bearings
  • Cast iron bearings
  • Ball bearings
  • Roller bearings
  • Any of the above
Answer: Roller bearings
Q3 | A coarse scres of major diameter 6 mm is designated as
  • 6 M x 6 x 1
  • M 6
  • 6 M x 1
  • 1 x 6 M
  • Coarse M 6
Answer: M 6
Q4 | A reinforced concrete beam is considered as made of
  • Homogeneous material
  • Composite material
  • Clad material
  • Isotropic material
  • Heterogeneous material
Answer: Heterogeneous material
Q5 | In concrete mixer, the bevel gears for rotating the drum are generally
  • Shaped
  • Forged
  • Hobbed
  • Precisely machined
  • Casted
Answer: Casted
Q6 | By using large thread angles in lifting machine
  • The load will be sustained in absence of the other
  • The load will be easily lifted
  • The mechanical advantage will be high
  • The mechanical advantage will be low
  • While unloading, little effort will be required
Answer: The mechanical advantage will be low
Q7 | The holding power of sunk key is due to resistance which it offers in
  • Shear
  • Crushing
  • Shear and crushing
  • Tension
  • (C) and (D) above
Answer: Shear and crushing
Q8 | Transverse fillet welded joints are designed for
  • shear, tensile
  • tensile, compressive
  • tensile, shear
  • compressive, shear
  • Increasing the diameter of threaded portion
Answer: tensile, shear
Q9 | The crest diameter of a screw thread is same as
  • Pitch diameter
  • Major diameter
  • Pitch diameter
  • Core diameter
  • Minor diameter
Answer: Major diameter
Q10 | All the dimensions for a standard system of interchangeable gears can be defined in terms of
  • Module
  • Diametral pitch and circular pitch
  • Pressure angle and pitch
  • No of teeth and pitch circular diameter
  • Addendum and dedendum
Answer: Pressure angle and pitch
Q11 | Which of the following theory is also known as maximum shear stress theory of the failure of a material at the elastic limit
  • Von Mises theory
  • Guests Tresca theory
  • Rankines theory
  • Increasing the diameter of threaded portion
  • Haig's theory
Answer: Guests Tresca theory
Q12 | A fillet weld having axis parallel to the direction of the applied load is known as
  • side fillet weld
  • end fillet weld
  • diagonal fillet weld
  • flat fillet weld
  • Increasing the diameter of threaded portion
Answer: side fillet weld
Q13 | As per Indian Boilers regulations the type of joint preferred for longitudinal joint is
  • Reveted butt joint
  • Any of above
  • Riveted lap joint
  • Welded joint
  • Welded joint with cover plate
Answer: Reveted butt joint
Q14 | In case of ball bearing
  • Inner race should harder than outer race
  • Outer race should be harder than balls
  • Only cage should be hardened
  • Inner race should be harder than balls
  • Inner race, outer race and balls should be equally hardened
Answer: Inner race, outer race and balls should be equally hardened
Q15 | The minimum thickness of steel members exposed to weather and accessible for painting is
  • Increasing the diameter of threaded portion
  • 6 mm
  • 12 mm
  • 8 mm
  • 10 mm
Answer: 6 mm
Q16 | In case of brittle material the theory of elastic failure generally applied is
  • Maximum total strain energy theory
  • Maximum principal stress theory
  • Distortion energy theory
  • Maximum shear stress theory
  • Maximum strain theory
Answer: Maximum principal stress theory
Q17 | Stone erusher rolls are generally made
  • Cast iron
  • High carbon steel
  • Mild steel
  • Cast steel
  • Grey iron
Answer: High carbon steel
Q18 | The natural frequency of a shaft in bending is
  • Nearly the same as the critical speed
  • Nearly half the critical speed
  • Exactly the same at which it is running
  • Nearly double of the critical speed
  • Depends on load and other factors
Answer: Nearly the same as the critical speed
Q19 | Which of the following key transmits power through frictional resistance only
  • Tangent key
  • Saddle key
  • Woodruff key
  • Kennedy key
  • Sunk key
Answer: Saddle key
Q20 | In the case of a cantilever, irrespective of the type, loading of the maximum bending moment and maximum shear force occur at
  • Free end
  • ?rd of length from fixed end
  • Centre
  • Increasing the diameter of threaded portion
  • Fixed end
Answer: Fixed end
Q21 | Manganese in steel increases its
  • Hardness
  • Ductility and Malleability
  • Tensile strength
  • Brittleness
  • Increasing the diameter of threaded portion
Answer: Tensile strength
Q22 | The diameter of a washer is generally
  • Equal to the diameter of bolt
  • Slightly less than the diameter of the bolt
  • Slight more than the diameter of the bolt
  • Of any size that suits the application
  • None of the above
Answer: Slight more than the diameter of the bolt
Q23 | If a square key and the shaft are to be of the same material and of equal strength, the length of key would be (d = dia. Of shaft)
  • 1.23 d
  • 1.50 d
  • 2 d
  • d
  • 0.75 d
Answer: 1.23 d
Q24 | The segmental bottom of a circular tank is subjected to
  • hoop tension
  • hoop compression
  • bending moment
  • none of the above
  • Increasing the diameter of threaded portion
Answer: hoop compression
Q25 | The pitch of 24 mm diameter metric threads would be
  • 6 mm
  • 1 mm
  • 2 mm
  • 5 mm
  • 3 mm
Answer: 3 mm
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