Columns

JKSSB Junior Engineer (Civil) · Mechanics and Structural Analysis · 9 practice questions with answers and explanations: 6 Easy, 3 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The Euler formula for buckling is not valid for:

  1. Hinged columns
  2. Steel columns
  3. Long slender columns
  4. Short columns with a low slenderness ratio
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Answer: D. Short columns fail by crushing before they can buckle.

Sample Easy question 2

The Euler load for a column fixed at one end and hinged at the other is about:

  1. Twice that of the same column hinged at both ends
  2. Half that of the hinged column
  3. Four times that of the hinged column
  4. The same as the hinged column
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Answer: A. Le = 0.7L, so P ∝ 1 ÷ 0.49 = 2.04.

Sample Easy question 3

A short rectangular column carrying an eccentric load has no tension in the section if the load acts within:

  1. The middle third of the depth
  2. The outer third
  3. The middle half
  4. The edge only
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Answer: A. The core of a rectangular section is the middle third in each direction.

Sample Medium question 4

A column has an effective length of 3,000 mm and a least radius of gyration of 30 mm. The slenderness ratio is:

  1. 90
  2. 10
  3. 1,000
  4. 100
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Answer: D. λ = Le ÷ r = 3,000 ÷ 30 = 100.

Sample Medium question 5

The least radius of gyration of a rectangular section 100 mm wide and 200 mm deep is:

  1. 28.87 mm
  2. 141.4 mm
  3. 57.74 mm
  4. 50 mm
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Answer: A. r = √(I ÷ A), and for the least value r = b ÷ √12 = 100 ÷ 3.464.

Sample Medium question 6

The Euler critical stress of a pin-ended column with a slenderness ratio of 100 and E = 200 GPa is about:

  1. 197 MPa
  2. 99 MPa
  3. 19.7 MPa
  4. 395 MPa
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Answer: A. σcr = π² E ÷ λ² = π² × 200,000 ÷ 10,000 = 197 MPa.

More Mechanics and Structural Analysis topics for JKSSB Junior Engineer (Civil)