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BARC 2020: Transportation and surveying Nuclear Quiz 3

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Question 1

The radius of a horizontal circular curve is 80 m. the designed speed is 45 kmph and the design coefficient of lateral friction is 0.15. superelevation will be- if lateral friction is assumed to be develop.

Question 2

Find the gradient for a broad gauge track such that the grade resistance together with curve resistance due to a curve of 20 shall be equal to the resistance due to a ruling gradient of 1 in 200.

Question 3

Aggregate impact value indicates the following property of aggregates

Question 4

A plate load test was conducted on a soaked subgrade during monsoon season using a plate diameter of 30 cm. The load value corresponding to mean settlement value of 0.125 cm is 1490 kg. What is the modulus of subgrade reaction (in kg/cm3) for the standard plate having 750 mm diameter?

Question 5

What should be the length of track to overcome temp. stress given, A = 60cm, µ = 1.10×10-5 per0c, E = 21.5×10 kg/cm2 & rise in temperature = 250c assume resistance to track movement = 700 kg/km

Question 6

If the chainage of point of commencement of a circular curve for a normal chord of 20 m is 2002.48m, the length of the first sub chord will be

Question 7

Choose the correct statement(s) with respect to the line of collimation.
i. The level line is always a straight line parallel to earth surface.
ii. Line of sight is the line joining the optical center of object glass.
iii. Line joining the axis of optical center of eyepiece with that of the object is telescope axis.
iv. Axis of the bubble tube follows the principle of a dumpy level.

Question 8

While running a line of levels from a bench mark of RL 23.47 m to another benchmark of RL 23.5 m, It was observed that the sum of backsights is 16.26 m. The sum of all the foresights should be __________m.

Question 9

A steel tape of nominal length (l) 30 m was used to measure a line by suspending it between supports. If the measured length (L) was 29.786 m when the slope angle (θ) was 4 ° 30' and the mean temperature (T) and normal tension applied were 10 and 101.76 N respectively.
The standard length (l') of the tape was 30.004 m at 20 and 45 N tension. The tape weighted 0.20 N/m and had a cross-sectional area of 2 mm2 with Young's modulus of elasticity = 2 x 105 N/mm2 and coefficient of thermal expansion () = 1.12 x 10-5/.
The correct horizontal length of the line is ________m.

Question 10

A base line measured with a steel tape gives an approximate length of 1000 m. The value of standardized pull is equivalent to 15 kg and the applied pull is 23 kg. The cross sectional area of tape is 0.0645 cm2 and E = 2.11 x 106 kg/cm2. Temperatures Tm and TO are 35 and 15, respectively. The coefficient of thermal expansion of the material of the tape per is 11.5 x 10-6. The difference in level of the two ends of base line is 2 m. R = 6400 km. Elevation of the base line above mean sea level = 1000 m.
Match List-I (Corrections) with List-II (Value) and select the correct answer using the codes given below the lists:
List-I
A) Correction for pull
B) Correction for temperature
C) Correction for sea level
D) Total correction
List-II
1) 0.23 m
2) 0.059 m
3) 0.1305 m
4) -0.15625 m
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Jun 17ESE & GATE CE