#### 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 in8 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)