A treadle bar is used for_____________________?

A. 2
B. 3
C. 4
D. 5

A. Broad Gauge
B. Metre Gauge
C. Narrow Gauge
D. none of the above

A. 28.49 m
B. 21.04 m
C. 14.24 m
D. 7.45 m

A. both arms are horizontal
B. semaphore arm lowered but warner arm horizontal
C. both semaphore and warner arms lowered
D. none of the above

A. 25 mm
B. 40 mm
C. 50 mm
D. 10mm

A. 1 in 8’/2
B. 1 in 12
C. 1 in 16
D. 1 in 20