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Special Course on OHE

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

Length of the current collector shoe is 500 mm.

a)

False

b)

True

2.

While moving RRCS, the audible alarm sound will be activated.

a)

False

b)

True

3.

What is the function of the Transition Bar in ROCS?

a)

To support the cantilever

b)

To connect ROCS with FOCS

c)

To reduce voltage drop

d)

To clamp insulators

4.

The contact wire in ROCS is tensioned mechanically.

a)

False

b)

True

5.

Mid-point anchor is used to control expansion and contraction forces.

a)

True

b)

False

6.

RRCS can be operated only when the system is

a)

Energized

b)

De-energized

c)

Under load

d)

Grounded

7.

From the track center to the third rail, the horizontal distance is ______

a)

3000mm

b)

1350mm

c)

1480mm

d)

1840mm

8.

Height of the contact wire in a 2x25 kV system high-rise OHE (DFCC) is

a)

8.94 m

b)

5.80 m

c)

7.57 m

d)

7.54 m

9.

3 Span overlap is adopted in

a)

EDFC Project

b)

DFCC Project

c)

EPC Project

d)

Nowhere

10.

Out of run (OOR) should be avoided at

a)

Curved Track

b)

Level Crossing

c)

All the above

d)

Tangent Track

11.

At obligatory locations, track separation should be between

a)

150mm to 700mm

b)

650mm to 720mm

c)

620mm to 700mm

d)

150mm to 720mm

12.

The minimum setting distance of a mast located on the platform is 4.75 m.

a)

False

b)

True

13.

Maximum span adopted in high-speed rail is

a)

72 m

b)

63 m

c)

54 m

d)

50 m

14.

Full form of RRCS is

a)

Retractable Rigid Catenary System

b)

Raised Rigid Catenary System

c)

Retractable Rigid Continuity System

d)

Rigid and Raised Catenary System

15.

Maximum design speed for High-Speed OHE system is

a)

160 km/h

b)

200 km/h

c)

250 km/h

d)

320 km/h

16.

Output voltage of a Scott-connected transformer is

a)

66 KV

b)

110 KV

c)

132 KV

d)

50 KV

17.

Generally, the sub-sector is between ____ & ____

a)

AFP & SP

b)

Gantry & Isolator

c)

FP & SSP

d)

SSP & Isolator

18.

Parallel interrupters are provided for extending the UP & DN line power supply.

a)

True

b)

False

19.

Protection of the transformer in TSS is by

a)

Transformer CB

b)

Feeder CB

c)

Interrupters

d)

Auto Transformer

20.

Voltage system used for Bullet Train OHE is

a)

25 kV AC

b)

2 x 25 kV AC

c)

1500 V DC

d)

750 V DC

21.

First aid boxes and shock treatment charts are provided at switching stations.

a)

False

b)

True

22.

M-15 ratio of concrete mix is

a)

1:3:9

b)

1:3:6

c)

1:2:4

d)

1:2:6

23.

The foundation center is measured from the track center to the face of the mast.

a)

False

b)

True

24.

The embedded length of a high-speed foundation is

a)

750mm

b)

500mm

c)

800mm

d)

600mm

25.

Clear span of ‘O’ type portal is

a)

None of the above

b)

20.05 m – 30.45 m

c)

9.91 m – 20.31 m

d)

30.50 m – 36.00 m

26.

Reverse deflection of the TTC structure is 60 mm.

a)

False

b)

True

27.

Which colour of GRP cover fasteners is used for tunnel sections?

a)

Blue

b)

White

c)

Black

d)

Pink

28.

DFCC catenary wire cross-sectional area is 129 sq. mm

a)

False

b)

True

29.

What is the cross-sectional area of the contact and catenary wires in High-speed OHE?

a)

120 sq.mm

b)

150 sq.mm

c)

170 sq.mm

d)

200 sq.mm

30.

Which component joins two conductor rails together in ROCS?

a)

Anchor Bar

b)

Interlocking Joint

c)

Swivel Head

d)

Drop Tube

31.

In the Third Rail System, the conductor rail is made of

a)

Pure copper

b)

Aluminium with stainless steel

c)

Mild steel

d)

Aluminium and zinc

32.

Isolators are supported above a mast with

a)

Bracket insulator

b)

Tie rod insulator

c)

Pedestal / support insulator

d)

Stay insulator

33.

Creepage distance of insulators in highly polluted zone area at the DFCC project

a)

1050 mm

b)

850 mm

c)

1612 mm

d)

1650 mm

34.

Maximum stagger of contact wire in curvature in metro is

a)

500 mm

b)

150 mm

c)

450 mm

d)

300 mm

35.

Which type of cantilever?

a)

Push off

b)

Pull off

36.

Size of Al. Bracket tube in modular cantilever is

a)

40 mm

b)

49 mm

c)

55 mm

d)

70 mm

37.

Take OFF / take ON point on Pantograph is

a)

650 to 720 mm

b)

150 to 750 mm

c)

100 to 700 mm

d)

200 to 500 mm

38.

Expansion joints are not required in a third rail traction system.

a)

TRUE

b)

FALSE

39.

Insulated overlap is required for

a)

OHE sectioning purpose

b)

To keep OHE in current collection

c)

To maintain the height of OHE conductors

d)

All of the above

40.

At the obligatory location, the turnout contact wire is kept ___ mm above the main line contact wire.

a)

100 mm

b)

50 mm

c)

20 mm

d)

5 mm

41.

Advantage of Spring ATD is

a)

Easy to Measure X & Y Values

b)

Lower Initial Cost

c)

None of the above

d)

Lower Maintenance

42.

Power block limit boards are to be provided at

a)

X-Over

b)

UIOL

c)

Turnouts

d)

IOL

43.

Size of the MS flat used in DFCC TSS is

a)

40 x 6 mm

b)

50 x 6 mm

c)

100 x 8 mm

d)

75 x 8 mm

44.

Long time clearance is

a)

200 mm

b)

250 cm

c)

250 mm

d)

200 cm

45.

Before running passenger trains, the section will be inspected by

a)

CRS

b)

PMC

c)

Sr. DEE

d)

CEO

46.

The FRP Insulator Cover is provided for

a)

Reducing weight

b)

Insulation and safety from electric contact

c)

Thermal expansion

d)

Alignment

47.

Which safety feature is included in RRCS operation?

a)

Voltage detection interlock

b)

Manual switch operation

c)

Separate supply feeder

d)

Counterweight tensioner

48.

Isolator clearance between Phase and Earth is

a)

450-500 mm

b)

490-520 mm

c)

500-550 mm

d)

550-600 mm

49.

'BDV' of transformer oil should be

a)

30 KV / minute

b)

40 KV / minute

c)

60 KV / minute

d)

100 KV / minute

50.

PTFE neutral section is suitable for a speed of

a)

70 km/hr

b)

90 km/hr

c)

100 km/hr

d)

130 km/hr

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