Compare AC & DC track circuits on i) Length of circuit ii) Application iii) Effect of stray currents. iv) Maintenance
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Ans: i) Length of circuit - a) AC track circuit is having long length upto 3 to 5 km b) DC track circuit is having short length 

ii)Application -a) AC track circuit is used where electricity is available and track current is carried by both the rails b)DC track circuit is used for non- electrified lines 

iii)Effect of stray currents -a) Stray currents has no effect on AC track circuit b) Stray current causes voltage drop in the un insulated rail .This limits the length of the circuit 

iv) Maintenance - a) AC track circuit has easier and cheaper maintenance b) DC track circuit has complicated maintenance 
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