50) Which one of the following surfaces will give highest coefficient of traction while using crawler track tractors

51) Rolling resistance of a wheel depends upon (i) Vehicle load (ii) Grade(iii) Ground conditions .Of these statements

52) Which of the following surfaces will give highest rolling resistance for a rubber tyred vehicle

53) If the gross vehicle weight of a truck is 30 t and rolling resistance is 30 kg/tonne, then the tractive effort required to keep the truck moving at a uniform speed is

54) The grade resistance factor for an earth moving machine can be obtained by multiplying grade percentage by a factor approximately equal to