Machine Design Set 19

Mechanical Engineering

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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 19

Q1 | In elevated circular steel tanks, hemispherical bottoms are preferred because
  • large capacity
  • better appearance
  • riveted connection between the side and bottom plates are easy
  • All of the above
  • Increasing the diameter of threaded portion
Answer: All of the above
Q2 | Stretching on a belt can be controlled by
  • decreasing belt length
  • decreasing stress in the belt
  • decreasing belt velocity
  • none of the above
  • Cast steel
Answer: decreasing stress in the belt
Q3 | The number of plastic hinges necessary to convert a framed structure into a mechanism is (r is degree of redundancy of the structure)
  • r - 1
  • r + 1
  • 2r + 1
  • 2r - 1
  • Increasing the diameter of threaded portion
Answer: r + 1
Q4 | The surface hardness that can be obtained by nitriding is generally in the range
  • 800 - 1000 VPN
  • Below 400 VPN
  • 1000 - 1100 VPN
  • 600 - 800 VPN
  • 400 - 600 VPN
Answer: 1000 - 1100 VPN
Q5 | A circulating water pump of a condenser is of the centrifugal type and directly connected to a three phase induction motor running at 900 rpm. The pump delivers 30,000 litres per minute against the dynamic head of 10 m. The horse power of the motor required to drive the pump would be
  • 40-50 HP
  • 50-60 HP
  • 60-70 HP
  • 30-40 HP
  • 20-30 HP
Answer: 60-70 HP
Q6 | Which process will improve the fatigue life of a part?
  • Electrocoating
  • Chemical coating
  • Shot peening
  • Polishing
  • Electroplating
Answer: Shot peening
Q7 | Addendum is
  • The depth of a gear tooth
  • Half the depth of a gear tooth
  • Depth of tooth space below the pitch circle
  • Height by which tooth projects beyond the pitch circle
  • None of the above
Answer: Height by which tooth projects beyond the pitch circle
Q8 | Commonly adopted material for rivets in
  • Mild steel
  • Cast iron
  • Wrought iron
  • Malleable iron
  • None of the above
Answer: Mild steel
Q9 | When power is to be transmitted by two pulleys of different materials, then design will be based on pulley
  • Having smaller diameter
  • Having larger diameter
  • Having (
  • Having (
  • Any of the above
Answer: Having (
Answer: Having (
Q10 | Two springs having stiffness are in series. The equivalent stiffness would be
  • K
  • K/4
  • 4 K
  • 2 K
  • K/2
Answer: K/2
Q11 | In case of ductile materials the theory of elastic failure generally applied is
  • Maximum shear stress theory
  • Maximum principal stress theory
  • Distortion energy theory
  • Maximum strain theory
  • Maximum total strain energy theory
Answer: Maximum shear stress theory
Q12 | Washer are generally specified by
  • Thickness
  • Outer diameter
  • Central hole diameter
  • Mean diameter
  • (A) and (C) above
Answer: Central hole diameter
Q13 | A coupling used to connect two perfectly aligned shafts is
  • bush pin coupling
  • Oldham coupling
  • rigid tlange coupling
  • none of the above
  • Cast steel
Answer: rigid tlange coupling
Q14 | Full stress reversal normally does not occur in bolted connections due to
  • surface hardness
  • ridges and valleys in the form of threads
  • varying cross-section
  • Increasing the diameter of threaded portion
  • pre-loading during tightening
Answer: pre-loading during tightening
Q15 | The frictional horse power loss in a bearing having 25 mm diameter subjected to a load of 200 kg rotating at 600 rpm will be of the order of
  • 2HP
  • 0.05 HP
  • 1 HP
  • 0.5 HP
  • 10 HP
Answer: 0.05 HP
Q16 | If the Brinell hardness number of a sample of steel is 200, the ultimate tensile strength will be approximately
  • Cannot be determined
  • 70 kgf/mm2
  • 200 kgf/mm2
  • 100 kgf/mm2
  • Silver
Answer: 70 kgf/mm2
Q17 | Which of the following key is used for light work?
  • Round key
  • Increasing the diameter of threaded portion
  • Tangent key
  • Sunk key
  • Saddle key
Answer: Saddle key
Q18 | For butt welding of two plates, each of which is 300 cm thick, the best process would be
  • Submerged are welding
  • MIG welding
  • TIG welding
  • Gas welding
  • Electro slag welding
Answer: Electro slag welding
Q19 | The number of possible independency mechanisms, n is determined from the following relationship
  • n = 2 N - r
  • n = 2 N + r
  • Increasing the diameter of threaded portion
  • n = N + r
  • n = N - r
Answer: n = N - r
Q20 | In as steam engine, piston rod is connected to the cross head by
  • flange coupling
  • universal coupling
  • cotter joint
  • knuckle joint
  • Increasing the diameter of threaded portion
Answer: cotter joint
Q21 | For water tight joints such as in boiler the rivets are driven
  • Increasing the diameter of threaded portion
  • either in hot or cold condition
  • in cold condition only
  • in hot condition only
Answer: in hot condition only
Q22 | Iniversal coupling is
  • Used for collinear shafts
  • Rigid coupling
  • Type of flange coupling
  • Used for non-collinear shafts
  • None of the above
Answer: Used for non-collinear shafts
Q23 | Ball bearing type screws are generally used
  • In bench vices
  • In screw jacks
  • In earthmoving machinery
  • Steering mechanisms
  • None of the above
Answer: Steering mechanisms
Q24 | The maximum size of the fillet weld that can be made in single pass is
  • 12 mm
  • 3 mm
  • Increasing the diameter of threaded portion
  • 8 mm
  • 6 mm
Answer: 8 mm
Q25 | Friction losses in spur gears may be of the order of
  • 15% to 20%
  • 20% to 30%
  • 5% to 10%
  • 10% to 15%
  • Less than 5%
Answer: Less than 5%
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