Railway Engineering

91. If D is the distance between the parallel sligings and β is the limiting angle of crossings, the distance between the noses of crossing measured parallel to the main track, is

1. D sin β
2. D cot β
3. D tan β
4. D sec β

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92. If G is gauge distance and a is crossing, the distance between the nose of acute crossing and nose of obtuse crossing of a rail diamond, measured along the rail not forming the diamond, is

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

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93. If G is gauge is metres, V is speed of trains in km/hour and R is radius of a curve in metres, the equilibrium super elevation is

1. GV²/R
2. GV²/17R
3. GV²/127R
4. GV²/130R

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94. If L is length of a rail and R is the radius of a curve, the versine h for the curve, is

1. a = L/4R
2. a = L²/4R
3. h = L²/8R
4. h = L²/16R

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95. If L₁ and L₂ are actual and theoretical lengths of a tongue rail, d is heel divergence and t is thickness

1. sin^-1 (d - t/L^-1)
2. tan^-1 (d - t/L^-1)
3. sin^-1 (d - t/L^-2)
4. tan^-1 (d - t/L^-2)

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96. If n is length of a rail in metres, the number of sleepers per rail length generally varies from

1. n to (n + 2)
2. (n + 2) to (n + 4)
3. (n + 3) to (n + 6)
4. (n + 4) to (n + 5)

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97. If S and H are strength and hardness index of a timber at 12% moisture content, the composite sleeper index, is

1. (H + 10S)/20
2. (S + 10H)/20
3. (20S + H)/10
4. (S + 20H)/10

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98. If S is cant deficiency in centimetres and V is maximum permissible speed in kmph, the maximum length of transition curves, is

1. SV/13.6
2. SV/19.8
3. SV/127
4. SV/16.8

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99. If sleeper density is M + 7 for 13 m rails, the minimum depth of ballast under wooden sleepers (25 cm × 13 cm), is

1. 15 cm
2. 20 cm
3. 25 cm
4. 30 cm

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100. If the standard length of a B.G. crossing is 597 cm, the number of crossing, is

1. 1 in 8½
2. 1 in 12
3. 1 in 16
4. None of these

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