Railway Engineering

81. Heel of crossing is the line joining

1. Ends of splice rail and point rail
2. Ends of lead rails butting the crossing
3. Ends of wing rails
4. Throat and actual nose of crossing

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82. If a 0.7% upgrade meets a 0.65% downgrade at a summit and the permissible rate of change of grade per chain length is 0.10%, the length of the vertical curve, is

1. 10 chains
2. 12 chains
3. 14 chains
4. 16 chains

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83. If a is average number of peaks more than 10 mm of unevenness 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 (I_c), as recommended by Indian Northern Railways, is

1. I_c = 10 - a - b - c/4
2. I_c = 20 - a - b - c/4
3. I_c = 30 - a - b - c/4
4. I_c = 40 - a - b - c/4

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84. If 'A' is the angle formed by two gauge faces, the crossing number will be

1. tan A
2. cot A
3. sec A
4. A rad

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85. If absolute levels of rails at the consecutive axles A, B, and C separated by 1.8 metres are 100.505 m, 100.530 m, and 100.525 m respectively, the unevenness of rails, is

1. 0.065 m
2. 0.055 m
3. 0.045 m
4. 0.035 m

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86. If D gle of crossing, the distance between the noses of crossing measured parallel to the main track, is

1. D tan α
2. D sec α
3. D cosec α
4. D cot α

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87. If D is distance between centres of two parallel track of gauge G, then, total length of cross-over (from the point of commencement to the point of termination) with an intermediate straight portion and N crossing, is given by

1. DN + G [N + √(1+N²)]
2. DN + G [2N + √(1+N²)]
3. DN + G [3N + √(N1+²)]
4. DN + G [4N + √(N1+²)]

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88. 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

1. √[D (4R - 2G - D)]
2. √[D (3R - 2G -D)]
3. √[D (3R + 2G - D)]
4. √[D (4 + 2G - D)]

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89. If D is the distance between parallel tracks G between theoretical noses of two crossings measured parallel to tracks, is

1. (D - G - G α) cot α
2. (D - G + G α) cor α
3. (D - G - G α) tan α
4. (D + G + G α) cot α

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90. If D is the distance between the parallel sidings and α is the angle of crossing, the distance between the noses of crossing measured parallel to the gathering line, is

1. D tan α
2. D cot α
3. D sin α
4. D cos α

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