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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 8

Q1 | A connecting rod in an IC Engine is to be designed against buckling. The end conditions considered are
  • Both the ends fixed
  • Both the ends are free
  • Both the ends are hinged
  • none of the above
  • Cast steel
Q2 | A ball bearing cannot be provided for
  • Big ends of connecting rods for I.C. engines
  • Variable load shafts
  • Variable speed shafts
  • Automobile gear shafts
  • Low speed shafts
Q3 | Which of the following drive has accurate speed ratio?
  • Flat cross-belt drive
  • Timing belt drive
  • V-belt 'C' section drive
  • V-belt 'B' section drive
  • Increasing the diameter of threaded portion
Q4 | Under which condition a material ordinatily said to be ductile undergoes a fracture similar to that of a brittle material
  • Cyclic loading at normal temperature
  • Long time static loading at elevated temperature
  • Impact loading specially at low temperatures
  • All of the above
  • None of the above
Q5 | When minimum axial thrust is the criteria, the choice of gears would been
  • Helical gears
  • Hypoid gears
  • Herringbone gears
  • Worm gears
  • None of the above
Q6 | A compressed air cylinder carries approximately 70 kg/cm2 pressure at the time of delivery. The inside diameter is 25 cm. If the steel has a yield point of 2300 kg/sq cm and a safety factor of 2.5 the wall thickness should be
  • 10 mm
  • 15 mm
  • 8 mm
  • 12 mm
  • 5 mm
Q7 | If during operation a boiler bursts, the matter should be reported to
  • State Government
  • Management
  • Central Government
  • Boiler inspector
  • Police
Q8 | The compression members tend to buckle in the direction of
  • Axis of load
  • Perpendicular to the axis of load
  • Minimum cross-section
  • Least radius of gyration
  • None of the above
Q9 | A concrete wall generally
  • Absorbs and transmits sound
  • Reflects sound
  • Transmits sound
  • Absorb sound
  • Creates sound
Q10 | When the bolt is subjected to shock loading the resilience of the bolt should be considered in order to prevent breakege at
  • Anywhere
  • Shank
  • Threaded portion
  • Head
  • Transition between head and shank
Q11 | Maximum efficiency expected in case of single mech supr gears is around
  • 58%
  • 98%
  • 88%
  • 68%
  • 78%
Q12 | In a gas turbine rotor a radial stress of 300 kg/sq cm tensile and 500 kg/sq cm tangential stress have been found at a point. The maximum shear stress at this point would be
  • 500 kg/cm2
  • 250 kg/cm2
  • 595 kg/cm2
  • 750 kg/sq-cm
  • 300 kg/cm2
Q13 | The life of ball bearings as listed in catalogue represents
  • 25% survival rate
  • 90% survival rate
  • 50% survival rate
  • 75% survival rate
  • Increasing the diameter of threaded portion
Q14 | Rinkine-Gordon formula for buckling load is adopted for columns having slenderness ratio between
  • 50 and 100
  • 30 and 50
  • 10 and 30
  • 120 and 200
  • Increasing the diameter of threaded portion
Q15 | Jaw clutches
  • cause shock loads when engaging
  • get disengaged at high rpm
  • get disengaged in reverse direction
  • are friction clutches which generate heat when enegaged
  • Increasing the diameter of threaded portion
Q16 | A rack is a gear
  • With infinite diametral pitch
  • With infinite pitch circle diameter
  • With infinite module
  • With infinite number of teeth
  • With infinite circular pitch
Q17 | Expansion joints are provided on pipes carrying
  • Viscous fluids
  • Water
  • Air at pressures below atmospheric pressure
  • Steam
  • Air at high pressures
Q18 | The advantage of needle roller bearing over ball bearing is
  • Less friction
  • Less area requirement
  • Smooth operation
  • Large ratio of load capacity to size
  • None of the above
Q19 | A V-belt designated as C 120 will have
  • 120 mm as the dia of small pulley
  • 120 cm as the length of belt
  • 120 inch as the length of belt
  • 120 cm as the centre distance between pulleys
  • None of the above
Q20 | Dielectric strength of a material is
  • Capacity to withstand high voltage
  • Capacity to resist flow of current
  • Capacity to take variable stresses
  • Energy storage capacity
  • Magnetic property
Q21 | According to IS 800, the lacing bars should resist a transverse shear equal to
  • 7.50%
  • 2.50%
  • Increasing the diameter of threaded portion
  • 17.50%
  • 12.50%
Q22 | The bunkers are the containers in which the plan of rupture intersects
  • the opposite face (wall) near the bottom
  • Increasing the diameter of threaded portion
  • the opposite face (wall) near the top
  • the bottom surface of material stored
  • the top surface of material stored
Q23 | Laser treatment of components increases fatigue resistance of metals by
  • compressing holes
  • filling vacancies
  • freezing discontinuities
  • none of the above
  • Increasing the diameter of threaded portion
Q24 | Failure of rolling bearings occurs mainly due to
  • lubrication failure
  • fatigue
  • load and deformation
  • Increasing the diameter of threaded portion
  • plastic deformation
Q25 | In elevated circular steel tanks, conical bottoms are attached when
  • Increasing the diameter of threaded portion
  • water is alkaline
  • water is oily
  • water is acidic
  • water is muddy