Which one of the following does not form a part of Derrick crane?
A.Boom
B.Jack
C.Must
D.Bull wheel
A.Boom
B.Jack
C.Must
D.Bull wheel
A.is n + 1
B.varies from n + 1 to n + 3
C.varies from n + 3 to n + 6
D.varies from n + 9 to n + 12
A.Dipper shovel
B.Clam shell
C.Drag line
D.Back hoe
A.stepped movement
B.slow speeds only
C.fast speeds only
D.infinitely variable speeds
A.fine dusts
B.granular materials
C.corrosive materials
D.package goods
A.screw type jacks
B.rack-and-lever type jacks
C.hydraulic jacks
D.all of the above
A.Wheat
B.Soda ash
C.Mica, pulverized
D.Lead salts
A.granular materials
B.lumpy materials
C.pulverized materials
D.all of the above
A.cast
B.cast and machined
C.cold headed
D.drop forged
A.Magnetic lifting hoist
B.Electric hoist
C.Hand chain hoist
D.all of the above