A. one on either side
B. two outside and one inside
C. one outside and two inside
D. two outside and two inside
A. web of rail
B. fishing plane
C. head of rail
D. foot of rail
A. Vi cot(cc/2)
B. cot(oc/2)
C. cot(A)
D. Vi cosec(a/2)
A. to permit lateral movement of the tongue rail
B. to maintain the two tongue rails at the exact distance
C. to ensure exact gauge at the toe of the switch as well as the nose of crossing
D. to prevent any vertical movement between the wing rail and nose of crossing
A. 143 mm
B. 156 mm
C. 172 mm
D. 129mm
A. heel of the switch to the toe of the switch
B. heel of the switch to the theoretical nose of the crossing
C. toe of the switch to the theoretical nose of crossing
D. toe of the switch to the actual nose of crossing
A. crushed head
B. angular break
C. split head
D. transverse fissures