Top 550+ Solved Machine Design MCQ Questions Answer

From 1 to 15 of 552

Q. The type of cam used for low and moderate speed engines is generally

a. Involute

b. Harmonic

c. Flat

d. Cylindrical

e. Tangent

  • b. Harmonic

Q. Which material is expected to be the hardest?

a. Brass

b. Copper-zinc

c. Molybdenum

d. Silver

e. Aluminium

  • c. Molybdenum

Q. For minimum noise use which type of gears are used

a. Bevel gears

b. Hypoid gears

c. Helical gears

d. Cast steel

e. Spur gears

  • c. Helical gears

Q. In cross or regular lay ropes

a. The direction of twist in wires in strands is opposite to the direction of twist of strands

b. The direction of twist in wires in strands is the same as the direction of twist of strands

c. Wires in two adjacent strands are twisted in opposite direction

d. Wires are never twisted

e. Only one wire is twisted and wrapped around

  • a. The direction of twist in wires in strands is opposite to the direction of twist of strands

Q. In case of sunk key

a. The key way is helical along the shaft

b. The key way is cut in bub only

c. The key way is cut in both shaft and hub

d. The key way is cut in shaft only

e. The key is in two parts

  • c. The key way is cut in both shaft and hub

Q. The included angle of American National threads is

a. 55?

b. 50?

c. 29?

d. 47

e. 60?

  • e. 60?

Q. Which of the following statement is false?

a. Ball and roller bearings are anti-friction bearings

b. The sleeve of a muff coupling is designed as a solid shaft

c. In designing gear, the tooth is considered as a cantilever subjected to an end load

d. Buttress threads are used to transmit power in one direction only

e. Increasing the diameter of threaded portion

  • b. The sleeve of a muff coupling is designed as a solid shaft

Q. Miter gears are

a. Spur gears with same number of teeth

b. Gears with different profiles

c. Helical gears with same number of teeth

d. Stepped spur gears

e. Right angled bevel gears with same number of teeth

  • e. Right angled bevel gears with same number of teeth

Q. Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because

a. helical gears have some helix angle but the spur gears are straight

b. there is end thrust in helical gears

c. in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate

d. none of the above

e. Cast steel

  • c. in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate

Q. In the case of roller bearings the contacting areas between rollers and running tracks are

a. Cast steel

b. oblong

c. parabolic

d. elliptical

e. circular

  • b. oblong

Q. In door shutters, the type of the spring used is

a. spiral spring

b. helical torsion spring

c. Cast steel

d. close coiled helical spring

e. conical helical spring

  • b. helical torsion spring

Q. The average values of modulus of rigidity for aluminium brass, copper and steel in descending order is

a. Aluminium, nickel, brass, copper and steel

b. Aluminium, copper, nickel, brass and steel

c. Aluminium, copper, brass, nickel and steel

d. Aluminium, brass, copper, nickel and steel

e. Aluminium, brass, nickel, copper and steel

  • d. Aluminium, brass, copper, nickel and steel

Q. In a ball bearing steel balls are made of

a. Carbon steel

b. Stainless steel

c. Cast iron

d. Carbon chrome steel

e. Brass

  • d. Carbon chrome steel
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