Air fuel ratio for idling speed of a petrol engine is approximately_________________?
A. 1 : 1
B. 5 : 1
C. 10:1
D. 15 : 1
E. 20 : 1
A. 1 : 1
B. 5 : 1
C. 10:1
D. 15 : 1
E. 20 : 1