Question

Hammering action on the rails is caused by _______

(a) Variation of pressure on the rails

(b) Variation of temperature on the rails

(c) Variation of thermal diffusibility of the rails

(d) Variation of crank effort

The question was asked by my college professor while I was bunking the class.

Query is from Effect of Partial Balancing of Reciprocating Parts of Two Cylinder Locomotives topic in section Balancing of Reciprocating Masses of Machine Dynamics

Answer 1

The correct answer is (a) Variation of pressure on the rails

Explanation: The maximum magnitude of the unbalanced force along the perpendicular to the line of stroke of rails is the hammering action caused by the variation in pressure on the rails due to unbalanced forces.