Which of the following is not an operating cost?

A. Fuel cost
B. Interest on capital
C. Depreciation
D. Insurance charges

A. water cooled
B. natural air cooled
C. forced air cooled
D. hydrogen cooled

A. nuclear power plants
B. hydraulic turbines
C. diesel engines
D. steam accumulators
E. none of the above

A. arc lamps
B. induction motors
C. fluorescent tubes
D. incandescent lamp

A. synchronous condenser
B. generator
C. induction motor
D. alternator

A. Cost of wages
B. Cost of fuel
C. Cost of lubricants
D. All of the above