Deck 4: Railway Track Design and Construction

Question 1

Safe speed (V) on a curve of radius 970 metres provided with two transition curves on Board Gauge track, is

A)112 km/hour
B)122 km/hour
C)132 km/hour
D)142 km/hour

Answer 1

132 km/hour

Question 2

Widening of gauge is provided if degree of the curve, is

A)3° or less
B)3° to 4½°
C)More than 4½°
D)None of these

Answer 2

More than 4½°

Question 3

The height of the rail for 52 kg rail section is

A)143 mm
B)156 mm
C)172 mm
D)129 mm

Answer 3

156 mm

Question 4

The life of a wooden sleeper depends upon

A)Quality of its timber
B)Ability to resist decay
C)Resistance to weathering
D)All the above

Question 5

Anti-creep anchors are fixed to rails by

A)Wedging
B)Spring grip
C)Clamping
D)All the above

Question 6

Sleeper density in India is normally kept as

A)(M + 2) to (M + 7)
B)M to (M + 2)
C)(M + 5) to (M + 10)
D)MM

Question 7

Composite sleeper index determines

A)Number of sleepers per rail length
B)Suitability of wooden sleepers
C)Permissible stresses in steel sleepers
D)None of these

Question 8

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

A)G cot ?
B)G tan ?
C)G sin ?
D)G cos ?

Question 9

Loose jaws of steel trough sleepers are made of

A)Cast steel
B)Mild steel
C)Cast iron
D)Spring steel

Question 10

Regional Indian railways use different types of sleepers according to their

A)Availability
B)Economy
C)Suitability
D)All the above

Question 11

In Indian railways, the ratio of axle load and weight of rail, is

A)312
B)412
C)512
D)600

Question 12

Maximum value of 'throw of switch' for Broad Gauge track is

A)89 mm
B)95 mm
C)100 mm
D)115 mm

Question 13

Top surface of steel sleepers, is

A)Kept level throughout
B)Provided a cant of 1 in 20 inward
C)Provided a cant of 1 in 20 outward
D)None of these

Question 14

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

A)D tan ?
B)D sec ?
C)D cosec ?
D)D cot ?

Question 15

Metal sleepers are superior to wooden sleepers with respect to

A)Cost
B)Life
C)Track circuiting
D)Fastening

Question 16

Charles Blacker Vignoles invented the flat footed rails in

A)1814
B)1836
C)1846
D)1856

Question 17

A triangle of railway consists of

A)Three turn outs
B)One turn out and two diamonds
C)Two turn outs and one split
D)One turn out, one split and one diamond

Question 18

A treadle bar is used for

A)Interlocking points and signal
B)Setting points and crossings
C)Setting marshalling yard signals
D)Track maintenance

Question 19

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

A)a = L/4R
B)a = L²/4R
C)h = L²/8R
D)h = L²/16R

Question 20

For metal sleepers with rounded edges, maximum size of ballast, is

A)50 mm
B)40 mm
C)30 mm
D)25 cm

Question 21

Head width of 52 kg rail section is

A)61.9 mm
B)66.7 mm
C)67 mm
D)72.33 mm

Question 22

Rail joint supported on a single sleeper, is known

A)Suspended rail joint
B)Bridge rail joint
C)Supported rail joint
D)Square rail joint

Question 23

Each block of a two-block concrete sleeper is

A)722 mm × 295 mm × 271 mm and 215 kg in weight
B)250 mm × 154 mm × 196 mm and 260 kg in weight
C)525 mm × 350 mm × 275 mm and 280 kg in weight
D)None of these

Question 24

The formation width for a double line Broad Gauge track in cutting (excluding drains) as adopted on Indian Railways is

A)6.10 m
B)8.84 m
C)10.21 m
D)10.82 m

Question 25

Arrangement made to divert the trains from one track to another, is known as

A)Railway point
B)Railway crossing
C)Turnout
D)Railway junction

Question 26

The standard dimensions of a wooden sleeper for a B.G. railway track are

A)2.74 m × 25 cm × 13 cm
B)1.83 m × 20 cm × 11 cm
C)1.52 m × 15 cm × 10 cm
D)1.75 cm × 20 cm × 12 cm

Question 27

The limiting value of cant excess for Broad Gauge is

A)55 mm
B)65 mm
C)75 mm
D)100 mm

Question 28

Indian Railways detects the rail flow by

A)Mitsubishi Rail flow dector
B)Soni Rail flow dector
C)Audi-gauge Rail flow detector
D)Kraut Kramer Rail flow detector

Question 29

The gradient on which an additional engine is required to negotiate the gradient, is called

A)Momentum gradient
B)Pusher gradient
C)Ruling gradient
D)Steep gradient

Question 30

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) $\sqrt{D (3R - 2G -D)}$
C) $\sqrt{D (3R + 2G - D)}$
D) $\sqrt{D (4 + 2G - D)}$

Question 31

Which of the following mechanical devices is used to ensure that route cannot be changed while the train is on the point even after putting back the signal?

A)Detectors
B)Point lock
C)Iock bar
D)Stretcher bar

Question 32

Pot sleepers are used if degree of the curve does not exceed

A)4°
B)5°
C)6°
D)7°

Question 33

Burnettising is done for the preservation of

A)Wooden sleepers
B)Rails
C)Ballast
D)None of these

Question 34

Consider the following statements:Automatic signalling system results in
1) Greater risk
2) Higher efficiency
3) Avoidance of block instruments
4) Higher operating cost
Of these statements

A)1 and 2 are correct
B)3 and 4 are correct
C)1 and 4 are correct
D)2 and 3 are correct

Question 35

A kink is made in stock rails, ahead of the toe of switch at a distance of

A)10 cm
B)15 cm
C)20 cm
D)30 cm

Question 36

Rails are fixed on steel sleepers

A)By bearing plates
B)By dog spikes
C)By keys in lugs or jaws
D)None of these

Question 37

Largest dimension of a rail is its

A)Height
B)Foot width
C)Head width
D)Any of the above

Question 38

The rail section which is not used on Indian metre gauge tracks, is

A)25 R
B)30 R
C)35 R
D)40 R

Question 39

Advantage of automatic signalling, is:

A)Increased safety
B)Reduction in delays
C)Increase in track capacity
D)All the above

Question 40

For developing thinly populated areas, the correct choice of gauge is

A)Broad Gauge
B)Meter Gauge
C)Narrow Gauge
D)Any of the above

Question 41

Coning of wheels

A)Prevent lateral movement of wheels
B)Provide smooth running of trains
C)Avoid excessive wear of inner faces of rail
D)All the above

Question 42

An extra 7.5 cm ballast width is not provided on outer side on a curve, if its degree is

A)6°
B)5°
C)4°
D)3°

Question 43

Standard size of wooden sleeper for Broad Gauge track is

A)275 × 25 × 13 cm
B)180 × 20 × 11.5 cm
C)225 × 23 × 13 cm
D)250 × 26 × 12 cm

Question 44

By interchanging gibs and cotters of a pot sleeper, gauge may be slackened by

A)1.2 mm
B)2.2 mm
C)3.2 mm
D)4.2 mm

Question 45

The main function of sleepers, is

A)To support rails
B)To hold rails at correct gauge
C)To distribute load from the rails to ballast
D)All the above

Question 46

The limiting value of cant gradient for all gauges is

A)1 in 360
B)1 in 720
C)1 in 1000
D)1 in 1200

Question 47

The spike commonly used to fix rails to wooden sleepers in Indian railways, is

A)Dog spike
B)Screw spike
C)Round spike
D)All the above

Question 48

Track construction involves preparation of

A)Sub-grade
B)Plate laying
C)Ballasting
D)All the above

Question 49

Study the following statements regarding creep.
(i. Creep is greater on curves than on tangent railway track
(ii. Creep in new rails is more than that in old rails
(iii) Creep is more on steep gradients than on level track.
The correct answer is

A)Only (i)
B)(i) and (ii)
C)(ii) and (iii)
D)(i), (ii) and (iii)

Question 50

According to Indian Railway Board, no diamond crossing should be flatter than

A)1 in 6
B)1 in 8½
C)1 in 12
D)1 in 16