Fifteen MCQ’s on Columns and Struts

Fifteen MCQ’s on Columns and Struts

Question.1. The load at which a vertical compression member just buckles is known as

(a) Critical load

(b) Crippling load

(c) Buckling load

(d) Any one of  these

Question.2. A column that fails due to direct stress is called

(a) Short column

(b) Long column

(c) Medium column

(d) Slender column

Question.3. A column whose slenderness ratio is greater than 120 is known as

(a) Short column

(b) Long column

(c) Medium column

(d) Composite column

Question.4. The direct stress included in a long column is………….. as compared to bending stress.

(a) More

(b) Less

(c) Same

(d) Negligible

Question.5. For long columns, the value of buckling load is……………..crushing load.

(a) Less than

(b) More than

(c) Equal to

(d) None of these

Question.6. The slenderness ratio is the ratio of

(a) Length of column to least radius of gyration

(b) Moment of inertia to area of cross-section

(c) Area of cross-section to moment of inertia

(d) Least radius of gyration to length of the column

Question.7. Compression members always tend to buckle in the direction of

(a) Vertical axis

(b) Horizontal axis

(c) Minimum cross-section

(d) Least radius of gyration

Question.8. A column has moment of inertia about X-X and Y-Y axis as follows

I_XX=4234.4 mm⁴

I_YY=236.3 mm⁴

This column will buckle about

(a) X-X axis

(b) Y-Y axis

(c) It depends upon the applied load

(d) None of these

Question.9. The Rankine formula holds good for

(a) Short column

(b) Long column

(c) Medium column

(d) Both short and long column

Question.10. A column of length 4m with both ends fixed may be considered as equivalent to a column of length ………….with both ends hinged.

(a) 2 m

(b) 1 m

(c) 3 m

(d) 6 m

Question.11. According to Euler, the buckling load for a column is given by . In this equation, the value of x for a column with one end fixed and other end free is

(a) 1

(b) 2

(c) 4

(d) 1/2

Question.12. According to Euler, the buckling load for a column is given by . In this equation, the value of x is minimum when

(a) Both ends fixed

(b) One end fixed, other free

(c)Both ends hinged

(d) One end fixed other hinged

Question.13. Rankine’s formula is generally used when slenderness ratio lies in between

(a) 0-60

(b) 0-80

(c) 0-100

(d) Any value

Question.14. Euler’s formula is not valid for mild steel column when slenderness ratio is

(a) More than 100

(b) Less than 100

(c) Less than 80

(d)More than 80

Question.15. An electric pole is 6.5 m high from the ground level. Its effective length for design purposes will be

(a) 6.5 m

(b) 3.25 m

(c) 13.0 m

(d) 12.0 m

Answers

1. (d)     2.(a)       3. (b)     4. (d)     5. (a)      6. (a)      7. (d)

8. (b)     9. (d)     10. (a)   11. (c)    12. (a)   13. (d)   14. (c)

15.(c)