avoidance of block instruments 4. higher operating cost Of these statements_____________________?

A. 40 mm
B. 50 mm
C. 75 mm
D. 100 mm

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

i) 2 obtuse angle crossings
ii) 4 obtuse angle crossings
iii) 4 acute angle crossings
iv) 6 acute angle crossings
The correct answer is ?
A. (i) and (iii)
B. (i)and(iv)
C. (ii) and (iii)
D. (ii) and (iv)

A. bridges and approaches
B. joints
C. both (A) and (B)
D. none of the above

A. 10mm
B. 13mm
C. 16mm
D. 19 mm

A. web of rail
B. fishing plane
C. head of rail
D. foot of rail