Railway Bridge And Tunnel Engineering Set 8 MCQs

Q1 | The standard dimensions of a wooden sleeper for a B.G. railway track are

2.74 m × 25 cm × 13 cm

1.83 m × 20 cm × 11 cm

1.52 m × 15 cm × 10 cm

1.75 cm × 20 cm × 12 cm

Q2 | The limiting value of cant excess for Broad Gauge is

55 mm

65 mm

75 mm

100 mm

Q3 | Indian Railways detects the rail flow by

Mitsubishi Rail flow dector

Soni Rail flow dector

Audi-gauge Rail flow detector

Kraut Kramer Rail flow detector

Q4 | The gradient on which an additional engine is required to negotiate the gradient, is called

Momentum gradient

Pusher gradient

Ruling gradient

Steep gradient

Q5 | 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

D (4R - 2G - D)]

D (3R - 2G -D)]

D (3R + 2G - D)]

D (4 + 2G - D)]

Q6 | 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?

Detectors

Point lock

Iock bar

Stretcher bar

Q7 | Pot sleepers are used if degree of the curve does not exceed

4°

5°

6°

7°

Q8 | Burnettising is done for the preservation of

Wooden sleepers

Rails

Ballast

None of these

Q9 | Consider the following statements:Automatic signalling system results in1. Greater risk2. Higher efficiency3. Avoidance of block instruments4. Higher operating costOf these statements

1 and 2 are correct

3 and 4 are correct

1 and 4 are correct

2 and 3 are correct

Q10 | A kink is made in stock rails, ahead of the toe of switch at a distance of

10 cm

15 cm

20 cm

30 cm

Q11 | Rails are fixed on steel sleepers

By bearing plates

By dog spikes

By keys in lugs or jaws

None of these

Q12 | Largest dimension of a rail is its

Height

Foot width

Head width

Any of the above

Q13 | The rail section which is not used on Indian metre gauge tracks, is

25 R

30 R

35 R

40 R

Q14 | Advantage of automatic signalling, is:

Increased safety

Reduction in delays

Increase in track capacity

All the above

Q15 | For developing thinly populated areas, the correct choice of gauge is

Broad Gauge

Meter Gauge

Narrow Gauge

Any of the above

Q16 | Coning of wheels

Prevent lateral movement of wheels

Provide smooth running of trains

Avoid excessive wear of inner faces of rail

All the above

Q17 | An extra 7.5 cm ballast width is not provided on outer side on a curve, if its degree is

6°

5°

4°

3°

Q18 | Standard size of wooden sleeper for Broad Gauge track is

275 × 25 × 13 cm

180 × 20 × 11.5 cm

225 × 23 × 13 cm

250 × 26 × 12 cm

Q19 | By interchanging gibs and cotters of a pot sleeper, gauge may be slackened by

1.2 mm

2.2 mm

3.2 mm

4.2 mm

Q20 | The main function of sleepers, is

To support rails

To hold rails at correct gauge

To distribute load from the rails to ballast

All the above

Q21 | The limiting value of cant gradient for all gauges is

1 in 360

1 in 720

1 in 1000

1 in 1200

Q22 | The spike commonly used to fix rails to wooden sleepers in Indian railways, is

Dog spike

Screw spike

Round spike

All the above

Q23 | Track construction involves preparation of

Sub-grade

Plate laying

Ballasting

All the above

Q24 | 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

Only (i)

(i) and (ii)

(ii) and (iii)

(i), (ii) and (iii)

Q25 | According to Indian Railway Board, no diamond crossing should be flatter than

1 in 6

1 in 8½

1 in 12

1 in 16