Machine Design MCQ
SET-4
61. The rolling contact bearings as compared to sliding contact bearings have
- A. small overall dimensions
- B. accuracy of shaft alignment
- C. low starting and low running friction except at very high speeds
- D. all of the above
Answer: D
62. The maximum normal stress theory is used for
- A. brittle materials
- B. ductile materials
- C. plastic materials
- D. non-ferrous materials
Answer: A
63. When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as
- A. spur gearing
- B. helical gearing
- C. bevel gearing
- D. spiral gearing
Answer: D
64. When a nut is tightened by placing a washer below it, the bolt will be subjected to
- A. tensile stress
- B. compressive stress
- C. shear stress
- D. none of these
Answer: A
65. A locking device extensively used in marine type connecting rod ends is a
- A. jam nut
- B. castle nut
- C. sawn nut
- D. ring nut
Answer: D
66. The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
- A. working depth
- B. clearance
- C. face width
- D. backlash
Answer: D
67. When a load W is suddenly applied to a bar of weight W1, the stress induced in the bar will increase with the increase in weight W1.
- A. Correct
- B. Incorrect
Answer: B
68. The endurance limit for a mirror polished material will be __________ as compared to unpolished material.
- A. same
- B. less
- C. more
Answer: C
69. A sliding bearing which operates without any lubricant present, is called
- A. zero film bearing
- B. boundary lubricated bearing
- C. hydrodynamic lubricated bearing
- D. hydrostatic lubricated bearing
Answer: A
70. The material used for brake lining should have __________ coefficient of friction.
- A. low
- B. high
Answer: B
71. Screws jacks have multiple threads.
- A. Agree
- B. Disagree
Answer: B
72. In an ordinary bolt, the effect of the impulsive loads applied axially is concentrated on the cross-sectional area at the root of the threads.
- A. Yes
- B. No
Answer: A
73. The radial distance of a tooth from the pitch circle to the top of the tooth is called
- A. dedendum
- B. addendum
- C. clearance
- D. working depth
Answer: B
74. In a gear, having involute teeth, the normal to the involute is a tangent to the
- A. pitch circle
- B. base circle
- C. addendum circle
- D. dedendum circle
Answer: B
75. Which of the following statement is correct ?
- A. The toughness of a material increases when it is heated.
- B. The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres.
- C. The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials.
- D. The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials.
Answer: C
76. The metal suitable for bearings subjected to light loads is
- A. silicon bronze
- B. white metal
- C. monel metal
- D. phosphor bronze
Answer: D
77. A connecting rod subjected to an axial load may buckle in the plane perpendicular to the plane of motion of the connecting rod.
- A. Correct
- B. Incorrect
Answer: A
78. Which of the following is an antifriction bearing?
- A. journal bearing
- B. pedestal bearing
- C. collar bearing
- D. needle bearing
Answer: D
79. A connecting rod is four times strong in buckling about Y-axis than about X-axis.
- A. Agree
- B. Disagree
Answer: A
80. In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)
- A. d + 17 mm
- B. 2 d + 13 mm
- C. 2 d + 20 mm
- D. 3.5 d
Answer: D