Question $2$

$35$ Marks

A$.$ A $20t$ locomotive is coupled to a train of $10$ loaded cars each of weight $6t.$ The locomotive

is drawing this load through a curve radius $100$ m at an average acceleration of $0\mathrm{.}10\frac{m}{s^2}$

down its grade of $1$ in $400.$ The rolling resistance of the locomotive and the cars are $73\mathrm{.}5$

$\frac{N}{t}$ and $49\frac{N}{t}$ respectively. If the coefficient of adhesion between locomotive wheels and

the rail is $0\mathrm{.}27,$ determine the following:

$($i$)$ The tractive effort of the locomotive

$($ii$)$ Curve resistance

$($iii$)$ The drawbar pull

B$.$

$($i$)$ Write short notes on trolley locomotive for underground mining applications

including one advantage and disadvantage

$($ii$)$ Briefly discuss the grandby type of mine car.