Machine Design

81. Silver-based solder is used for

  1. flaring
  2. brazing
  3. soft soldering
  4. fusion welding
  5. none of the above.'

Correct answer: (B)
brazing

82. Split nut is a locking device in which

  1. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
  2. a slot is cut partly in middle of nut and then slot reduced by tightening screw
  3. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
  4. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end
  5. none of the above.

Correct answer: (B)
a slot is cut partly in middle of nut and then slot reduced by tightening screw

83. Spring index is

  1. ratio of coil diameter to wire diameter
  2. load required to produce unit deflection
  3. its capability of storing energy
  4. indication of quality of spring
  5. nothing.

Correct answer: (A)
ratio of coil diameter to wire diameter

84. Spring stiffness is

  1. ratio of coil diameter to wire diameter
  2. load required to produce unit deflection
  3. its capability of storing energy
  4. its ability to absorb shocks
  5. none of the above.

Correct answer: (B)
load required to produce unit deflection

85. Stress concentration in cyclic loading is more serious in

  1. ductile materials
  2. brittle materials
  3. equally serious in both cases
  4. depends on other factors
  5. unpredictable.

Correct answer: (A)
ductile materials

86. Stress concentration in static loading is more serious in

  1. ductile materials
  2. brittle materials
  3. equally serious in both cases
  4. depends on other factors
  5. unpredictable.

Correct answer: (B)
brittle materials

87. Stress concentration is caused due to

  1. variation in properties of material from point to point in a member
  2. pitting at'points or areas at which loads on a member are applied
  3. abrupt change of section
  4. all of the above
  5. none of the above.

Correct answer: (D)
all of the above

88. Taper on the cotter and slot is provided

  1. on both the sides
  2. on one side only
  3. on none of the sides
  4. may be provided anywhere
  5. none of the above.

Correct answer: (B)
on one side only

89. Taper usually provided on cotter is

  1. 1 in 5
  2. 1 in 10
  3. 1 in 24
  4. 1 in 40
  5. 1 in 50.

Correct answer: (C)
1 in 24

90. Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

  1. Brinell
  2. Rockwell
  3. Vicker
  4. Shore's sceleroscope
  5. none of the above.

Correct answer: (A)
Brinell

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