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496. Most significant which imposes limitations in raising the high speeds is:
(a) adhesion of wheels
(b) resistance due to oscillations
(c) flange resistance
(d) air or wind resistance

497. The rails are welded by:
(a) Thermit welding
(b) Gas welding
(c) Arc welding
(d) MIG welding

498. Steel sleepers are ..... shaped in section.
(a) oval
(b) rectangular
(c) trough
(d) semi-spherical

Ans:- C 499. In India generally the sleeper density of sleepers per rail length used is:
(a) 18
(b) 30
(c) 12
(d) 24

500. The extra rails provided over bridge to prevent damage and danger in case of derailment on the bridge are known as:
(a) Stock rails
(b) Guard rails
(c) Check rails
(d) Wing rails