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Most Important MECHANICAL Engineering INTERVIEW Question subject wise

Q. 76. The neutral axis of the cross-section a beam is that axis at which the bending stress is zero (True)

Q. 77. The bending stress in a beam is directly proportional to bending moment. (True)

Q.78. At the neutral axis of a beam

1. a) the layers are subjected to maximum bending stress
2. b) the layers are subjected to minimum bending stress
3. c) the layers are subjected to compression
4. d) the layers do not undergo any strain

Q. 79. The neutral axis of a beam is subjected to ……….. stress.

1. a) Zero b) maximum tensile c) minimum tensile d) maximum compressive

Q.80. A flitched beam is used to

1. a) change the shape of the beam
2. b) effect the saving in material
3. c) equalise the strength in tension and compression
4. d) increase the cross-section of the beam

Q. 81. A rectangular beam of length l supported at its two ends carries a central point load W. The maximum deflection occurs

1. a) at the ends
2. b) at l/3 from both ends
3. c) at the centre
4. d) none of these

Q.82. In a cantilever beam of length l subjected to a uniformly distributed load of w per unit length the maximum deflection lies at the fixed end (True)

Q. 83. The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as

1. a) bending moment
2. b) twisting moment
3. c) torsional rigidity
4. d) flexural rigidity

Q. 84. When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under

1. a) tensile stress
2. b) compressive stress
3. c) shear stress
4. d) bending stress

Q. 85. The shear stress at the centre of a circular shaft under torsion is

a) zero b) minimum c) maximum d) infinity

Q. 86. The shear stress at the outermost fibres of a circular shaft under torsion is

1. a) zero
2. b) minimum
3. c) maximum
4. d) infinity

Q. 87. The torsional rigidity of shaft is expressed by the torque required to produce a twist of one radian per unit length of a shaft. (True/False) :- True

Q. 88. For a shaft, the shear stress at a point is …………… the the distance from the axis of the shaft.

1. a) equal to
2. b) directly proportional to
3. c) inversely proportional to

Q. 89. IN spring balances, the spring is used

1. a) to apply forces
2. b) to measure forces
3. c) to absorb shock
4. d) to store strain energy

Q. 90 The stiffness of a closely-coiled helical spring is ……………. proportional to number of turns.

1. a) directly
2. b) inversely

Q. 91. Rivets are generally specified by

1. a) thickness of plates to be joined
2. b) overall length
3. c) shank diameter
4. d) leak-proof

Q. 92. The design of thin cylindrical shells is based on

1. a) hoop stress
2. b) longitudinal stress
3. c) arithmetic mean of the hoop and the longitudinal stress
4. d) geometric mean of the hoop and longitudinal stress

Q. 93. When a thin cylindrical shell is subjected to an internal pressure, there will be an increase in diameter and length of the shell (True)

Q. 94.The hoop stress in a thick cylindrical shell is maximum at the inner radius.

1. a)True
2. b) False

Q. 95. The load at which the column just buckles, is known as

4. d) any one of these

Q. 96. The buckling load for a given column depends upon

1. a) area of cross-section of the column
2. b) length and least radius of gyration of the column
3. c) modulus of elasticity for the material of the column
4. d) all of the above

Q. 97. The slenderness ratio is the ratio of

1. a) area of column to least radius of gyration
2. b) length of column to least radius of gyration

Q. 98. The column whose slenderness ratio is less than 80, are known as

1. a) short column
2. b) long column

Q. 99. Euler’s formula holds good only for

1. a) short column
2. b) long column
3. c) both short and long column
4. d) weak columns

Q. 100. The rankine’s formula holds good for

1. a) short column
2. b) long column
3. c) weak column
4. d) both short and long column

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