Railways

1

If a is average number of peaks more than 10 mm of uneveness per kilometre, b is average number peaks more than 6 mm for gauge variation per kilometre and c is average number of peaks more than 2 mm twist per metre, then composite current recording index (Ic), as recommended by Indian Northern Railways, is

A. `l_c `= 10 - a - b - c/4
B. `l_c `= 20 - a - b - c/4
C. `l_c `= 30 - a - b - c/4
D. `l_c `= 40 - a - b - c/4

2

If S is the switch angle and `alpha` is diamond angle, r is the radius of slip, the distance between middle point slip and the nose of obtuse crossing, is

A. `r [ sec (alpha/2 - S) - 1]`
B. `r [ sec (S - alpha/2) - 1]`
C. `r [ sec ((alpha-S)/(2)) - 1]`
D. `r [ sec ((alpha-S)/(2)) +1]`

3

If the standard length of a crossing is 480 cm, the number of crossing is

A. 1 in` 8 1/2` of B.G.
B. 1 in`8 1/2` of M.G.
C. both (a) and (b)
D. none of these.

4

 

If D is distance between centres of two parallel tracks of gauge G with entire curved leads and equal angles of crossing, total length of crossover, is

A. `sqrt( D (4R - 2G - D))`
B. `sqrt( D (4R - 2G - D))`
C. `sqrt( D (3R + 2G - D))`
D. `sqrt( D (4 + 2G - D))`

5

If w is width of sleepers, s is sleeper spacing and d is depth of ballast then

A. `d = (S - W)/(2)`
B. `d = (S - W)/(3)`
C. `d = (S - W)/(4)`
D. `d = (S - W)/(5)`
E. `d = (S - W)/(6)`