Machine Design MCQs with answers Page - 49

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Q. Which type of gears are preferred for low noise applications?

  • (A) Spur gears with cycloidal profile
  • (B) Spur gears with involute profile
  • (C) Bevel gears
  • (D) Helical gears

A

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Q. A screw jack spindle is provided with

  • (A) Vee threads
  • (B) BSW threads
  • (C) Buttress threads
  • (D) Square threads

A

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Q. In elevated circular steel tanks, hemispherical bottoms are preferred because

  • (A) large capacity
  • (B) better appearance
  • (C) riveted connection between the side and bottom plates are easy
  • (D) All of the above

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Q. Stretching on a belt can be controlled by

  • (A) decreasing belt length
  • (B) decreasing stress in the belt
  • (C) decreasing belt velocity
  • (D) none of the above

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Q. The number of plastic hinges necessary to convert a framed structure into a mechanism is (r is degree of redundancy of the structure)

  • (A) r - 1
  • (B) r + 1
  • (C) 2r + 1
  • (D) 2r - 1

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Q. The surface hardness that can be obtained by nitriding is generally in the range

  • (A) 800 - 1000 VPN
  • (B) Below 400 VPN
  • (C) 1000 - 1100 VPN
  • (D) 600 - 800 VPN

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Q. 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

  • (A) 40-50 HP
  • (B) 50-60 HP
  • (C) 60-70 HP
  • (D) 30-40 HP

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