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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 17

Q1 | The plastic design of steel structures which is based on the statical method of plastic analysis is
  • independent of safety
  • gegas no indication of safety
  • Increasing the diameter of threaded portion
  • Safe
  • Unsafe
Q2 | Which is the variable stress
  • Fluctuating
  • Reversed
  • Repeated
  • Alternating
  • All of the above
Q3 | Which of the following bearings will have least coefficient of friction?
  • Tapered bearing
  • Self-aligning bearing
  • Cylinder roller bearing
  • Thrust ball bearing
  • Single ball bearing
Q4 | A stud has
  • Counter shunk head
  • Allen head
  • Slotted head
  • Cylindrical head
  • Both ends threaded
Q5 | The selection of material for gears depends on
  • Peripheral speed
  • Type of service
  • Required dimensions and weight of the drive
  • Shock and wear resistance
  • All of the above
Q6 | When large quantities of bolts are to be purchased the quantity is usually specified in terms of
  • Number
  • Volume
  • Packets
  • Weight
  • None of the above
Q7 | Both Soderberg and Gerber criteria for failure theories are overly conservative
  • near the middle of the curves
  • near the right end of the curves
  • Increasing the diameter of threaded portion
  • near the left end of the curves
  • near the left as well as right ends of the curve
Q8 | Which of the following statement is incorrect?
  • For columns, the solid round bar is less economical than the turbular section
  • The radius of gyration for the tubular section in all directions remains the same
  • A tubular section is most economical for the column free to buckle in any direction
  • none of the above
  • Increasing the diameter of threaded portion
Q9 | Coriolis component of acceleration is encountered in
  • Lower pair
  • Higher pair
  • Whit worth-quick-return motion
  • Four bar mechanism
  • Mechanism of steam engine
Q10 | Large sections usually have a somewhat lower permissible stress than small sections. This is due to
  • less homogeneity of structure of material
  • larger residual stress
  • greater probability of structural flaws
  • All of the above
  • Increasing the diameter of threaded portion
Q11 | The ends of the coil of compression spring which are in contact with the seat are
  • Carry maximum load
  • Have significant role in compression
  • Inactive
  • Most active
  • As active as spring
Q12 | Transverse slots are provided on a thread
  • To reduce effort required to cut threads
  • For simplicity
  • For chip removal and lubrication
  • To reduce stress on threads to be cut
  • To reduce stress on die
Q13 | Plow bolts are widely used in
  • electrical fittings
  • plastics
  • form machinery
  • electronic components
  • Increasing the diameter of threaded portion
Q14 | In case of spur gears, the back lash depends on
  • Module
  • Pitch line velocity
  • Tooth profile
  • Both (A) and (B) above
  • None of the above
Q15 | If the threads on a bolt are right hand the threads on nut will be
  • Right hand with less clearance
  • Right hand withmore clerance
  • Left hand with more clearance
  • Right hand
  • Left hand
Q16 | Sand drops from the bottom of a hopper into a horizontally moving belt conveyor. If the conveyor is travelling at 2000 fpm and the sand is fed at the rate of 1500 1b/min, the force necessary to drive the conveyor would be
  • 258 lb
  • Zero
  • Cannot be determined from the given data
  • 10 kg
  • 516 lb
Q17 | In nylon bearings operate at very high rpm molybdenum disulphide as used mainly to
  • assists in heat dissipation
  • provide porous bearing media for vibration absorption
  • Increasing the diameter of threaded portion
  • reduce frictional losses
  • improve mechanical and lubricating properties
Q18 | The pin supporting the exhaust iever of an internal combustion engine is subjected to a shear load of 400 kg/sq-cm the diameter of the pin should be
  • 1.5 cm
  • 4 cm
  • 1 cm
  • 6 cm
  • 2 cm
Q19 | Which of the following is not a standard ball diameter for Brinell hardness testing?
  • 25 mm
  • 1 mm
  • 10 mm
  • 5 mm
  • 2 mm
Q20 | Rivets are made of
  • Brittle material
  • Ductile material
  • Soft material
  • Hard material
  • None of the above
Q21 | A rolled steel flat designated as 50 ISF 8 means
  • the flat is 50 mm wide and 8 mm thick
  • Increasing the diameter of threaded portion
  • the flat has cross-section 50 sq. mm and depth 8 mm
  • the flat has cross-section 50 sq mm and width 8 mm
  • the flat is 50 mm long and 8 mm thick
Q22 | The loss of strength in compression which occurs when there is a gain in strength in the tension due to overloading is
  • Bousehinger effect
  • Relaxation
  • Hysteresis
  • Iso-strain
  • Hooke's effect
Q23 | A spherical gas tank is made of 1 cm steel plate hemispheres but welded together. The tank is 1503 cm in diameter. The allowable internal pressure to which tank may be subjected is the permissible stress be limited to 840 kg/sq cm would be in the range
  • 2.0 to 2.5 kg/sq-cm
  • 3.5 to 5.0 kg/sq-cm
  • 2.5 to 3.5 kg/sq-cm
  • 1.5 to 2.0 kg/sq-cm
  • 1 to 1.5 kg/sq-cm
Q24 | Which type of gears are preferred for low noise applications?
  • Spur gears with cycloidal profile
  • Spur gears with involute profile
  • Bevel gears
  • Helical gears
  • Any of the above
Q25 | A screw jack spindle is provided with
  • Vee threads
  • BSW threads
  • Buttress threads
  • Square threads
  • None of the above