Construction Planning and Management
The part of a derrick crane include (i) Mast (ii) Boom (iii) Bull wheel (iv) Jack which of these statements are correct?

(i), (iii) and (iv) are correct
(ii), (iii) and (iv) are correct
(i), (ii) and (iii) are correct
(i), (ii) and (iv) are correct

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Construction Planning and Management
Consider the following statements for a power shovel: (i) Output can be increased by reducing the angle of swing for a given depth of cut. (ii) For a given angle of swing, output will be maximum at optimum depth of cut. (iii) Output can be increased by keeping the depth of cut less than optimum depth. (iv) Output can be increased by increasing the size of shovel.

(i) and (iv) are correct
(i), (iii) and (iv) are correct
(i), (ii) and (iv) are correct
(ii), (iii) and (iv) are correct

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Construction Planning and Management
Free float is mainly used to

Establish priorities
Identify the activities, which can be delayed without affecting the total float of succeeding activity
Identify the activities which can be delayed without affecting the total float of either the preceding or succeeding activities
Identify the activities which can be delayed without affecting the total float of preceding activity

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