Civil Engineering - UPSC Civil Service Exam Questions

46. 

A simply supported beam AB of span L is subjected to a concentrated load W at the centre C of the span. According to Mohr's moment area method, which one of the following gives the deflection under the load ?

A. Moment of the area of M/EI diagram between A and C taken about C.
B. Moment of the area of M/EI diagram between A and B taken about B.
C. Moment of the area of M/EI diagram between A and C taken about A.
D. Moment of the area of M/EI diagram between A and C taken about B.

Answer: Option C

Explanation:

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47. 

A bar of circular cross-section varies uniformly from a cross-section 2D to D. If extension of the bar is calculated treating it as a bar of average diameter, then the percentage error will be

A. 10
B. 25
C. 33.33
D. 50

Answer: Option B

Explanation:

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48. 

While concreting in cold weather where frosting is also likely, one uses

A. high quality portland cement with minimum volumes of added water
B. high alumina cement with calcium chloride additives
C. portland cement together with calcium chloride additives
D. a mixture of high alumina cement and portland cement.

Answer: Option C

Explanation:

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49. 

A 600 mm long and 50 mm diameter rod of steel (E = 200 GPa, α = 12 x 10-6/°C) is attached at the ends to unyielding supports. When the temperature is 30°C there is no stress in the rod. After the temperature of the rod drops to - 20°C, the axial stress in the rod will be

A. 24 MPa (compressive)
B. 72 MPa (compressive)
C. 120 MPa (tensile)
D. 144 MPa (compressive)

Answer: Option C

Explanation:

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50. 

The correct sequence, in the direction of the flow of water for installations in the hydro-power plant is

A. reservoir, surge tank turbine, penstock
B. reservoir, penstock, surge tank, turbine
C. reservoir, penstock, turbine, surge tank
D. reservoir, surge tank, penstock, turbine

Answer: Option B

Explanation:

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