The part of a derrick crane include (i) Mast (ii) Boom (iii) Bull wheel (iv) Jack which of these statements are correct? A. (i), (ii) and (iv) are correct B. (ii), (iii) and (iv) are correct C. (i), (iii) and (iv) are correct D. (i), (ii) and (iii) are correct

The correct answer is D. (i), (ii) and (iii) are correct.

A derrick crane is a type of crane that uses a rotating arm to lift and move heavy objects. The main parts of a derrick crane are the mast, boom, bull wheel, and winch.

• The mast is the vertical pole that supports the boom.
• The boom is the horizontal arm that extends from the mast and supports the load.
• The bull wheel is a large wheel that is used to rotate the boom.
• The winch is a machine that is used to raise and lower the load.

The jack is not a part of a derrick crane. It is a tool that is used to lift heavy objects.