37) A tractor whose weight is 20 tonnes has a drawbar pull of 2500 kg, when operated on a level road having a rolling resistance of 30 kg per tonne. If this tractor is operated on a level road having a rolling resistance of 40 kg per tonne, then the drawbar pull of the tractor will

38) Which of the following earth moving machines has the shortest cycle time

39) Which of the following excavators is most suitable for digging under water

40) The part of a derrick crane include (i) Mast (ii) Boom (iii) Bull wheel (iv) Jack Of these statements

41) For which of the following materials, the output of power shovels for a fixed shovel size will be maximum