Question

Which one of the curves below represents a road gradient of 10%, if the mass of the vehicle is 1 ton?

(a) B

(b) A

(c) D

(d) C

I got this question during an interview.

This is a very interesting question from Vehicles and Powertrain topic in portion Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

Answer 1

The correct option is (a) B

The best explanation: Fgradient = mvehicle * g * sin (α). For small angles α, sin (α) = α = G. At G = 10%, sin (α) = 0.1 = α. Hence Fgradient = 1000 * 9.81 * 0.1 = 981 N. Using G = 0% curve as base curve and at speed = 0 Kmph, curve B is higher than the G = 0% curve across the full speed range.