Question

What is the gap in millimeters in the contact breaker?

(a) 0.35-0.45

(b) 0.5-0.7

(c) 0.7-0.9

(d) 1-1.5

The question was posed to me during an interview for a job.

Asked question is from Types of Ignition System in division Conventional Ignition System of Automotive Engine Design

Answer 1

The correct option is (a) 0.35-0.45

For explanation: The contact breaker gap is between 0.35 to 0.45 millimeters. In case the gap is too small the points will not open for the period which is sufficient for the coil to function. This will cause the points to burn rapidly and the engine to misfire at all the speeds.