Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators? A. Light duty B. Medium dutyC. Heavy duty D. All of the above
Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators? A. Light duty B. Medium dutyC. Heavy duty D. All of the above
For a particular application the type of electric-and control gear are determined by which of the following considerations ? A. Starting torque B. Conditions of environment C. Limitation on starting current D. Speed control range and its natureE. All of…
The load cycle for a motor driving a power press will be________________? A. variable load B. continuous C. continuous but periodicalD. intermittent and variable load
Which of the following motors always starts on load ? A. Conveyor motor B. Floor mill motor C. Fan motorD. All of the above
While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ? A. Running characteristics B. Starting characteristics C. EfficiencyD. Braking
The selection of an electric motor for any application depends on which of the following factors ? A. Electrical characteristics B. Mechanical characteristics C. Size and rating of motors D. CostE. All of the above
Which of the following motors is preferred for traction work ? A. Universal motor B. D.C. series motorC. Synchronous motor D. Three-phase induction motor
________________is preferred for automatic drives? A. Squirrel cage induction motor B. Synchronous motorsC. Ward-Leonard controlled D.C. motors D. Any of the above
When the load is above _______________ a synchronous motor is found to be more economical? A. 2 kW B. 20 kW C. 50 kWD. 100 kW
Light duty cranes are used in which of the following ? A. Power houses B. Pumping stations C. Automobile workshopsD. All of the above