11. If the diameter of a wire is 'D' then the diameter of simple round straw rope is
12. Coal plough mounted on an armoured . . . . . . . . conveyor and cuts slice of coal.
13. A foot valve in the suction pipe to prevent water returning to the . . . . . . . .
14. The gathering arms are operated by . . . . . . . . discs.
15. Ropes used Biocable rope way.
16. Direct rope haulage not suitable for . . . . . . . . of roads.
17. Equal lay ropes are also termed as . . . . . . . .
18. For a positive displacement pump it is the theoretical volume per revolution of the pump shaft called . . . . . . . .
19. Gathering arms are operated by separate driving . . . . . . . . for each arm.
20. Which of the following force is not acted on mine car which is in motion.
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