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43.

Assertion (A): Activity 5-7 is critical.
Reason (R) : Earliest finish time and latest finish time for events 5-7 are same
Select the correct answer.                        
A. A is correct but R is not correct B. R is correct but A is not correct
C. both A and R are correct D. both A and R are incorrect



44.

A tractor whose weight is 20 tonnes has a drawbar pull of 2500 kg, when operated on a level road having a rolling resistence 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                        
A. reduce by 200 kg B. increase by 200 kg
C. increase by 250 kg D. reduce by 250 kg



45.

Which of the following earth moving machines has the shortest cycle time?                        
A. Drag line B. Hoe
C. Clam shell D. Dipper shovel




46.

Which of the following excavators is most suitable for digging under water?                        
A. Drag line B. Hoe
C. Clam shell D. Dipper shovel



47.

For which of the following materials, the output of power shovels for a fixed shovel size will be maximum                        
A. Moist loam B. Good common earth
C. We|l blasted rock D. Wet sticky clay



48.

For a given size of bucket, the ideal output of a dragline will be least in                        
A. Moist loam B. Sand and gravel
C. Good common earth D. Wet sticky clay



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