HOISTING CRANE – ELECTRICAL & MECHANICAL MAINTENANCE
Important Interview Questions & Answers (Mobile • Tablet • Laptop Friendly)
Basic Crane Knowledge
Q1. What is a hoisting crane?
A hoisting crane is a machine used to lift, lower, and move heavy loads
using motors, brakes, wire ropes, and control systems.
Q2. Types of cranes?
EOT Crane, Gantry Crane, Jib Crane, Monorail Crane.
Electrical Maintenance
Q3. Which motor is used for hoisting?
Slip ring induction motor due to high starting torque and smooth control.
Q4. Why DC brake is used?
DC brake provides fast response and strong holding force.
Q5. What is overload protection?
It prevents lifting load beyond Safe Working Load (SWL).
Mechanical Maintenance
Q6. Function of wire rope?
Wire rope safely lifts and holds the load.
Q7. Causes of crane jerking?
Brake issue, misalignment, slip ring fault, or VFD parameter problem.
Safety
Q8. What is LOTO?
Lock Out Tag Out ensures safety during maintenance work.
Q9. Safety before maintenance?
Power isolation, LOTO, PPE, and no load on crane.
