Electric Drives Sample Electrical Engineering Job Questions, Practice Questions on Electric Drives, Job Interview Questions, Electric Drive Written Test Questions:
Explain the Concept of Electric Drives.
What are single phase DC Drives?
Three phase DC Drives.
Explain the Chopper Drives, AC Drives, Induction Motor Drives,
Synchronous Motor Drives
Method for speed control of DC Motors
Characteristics of a motor with constant torque & Constant power mode regions
Working, waveform and equations for single phase dc motor
Working, waveforms and equations for three phase dc motor.
Explain the method for speed control of dc series motor using three phase semiconductor. Draw waveform.
Numerical Questions regarding calculation of motor current, motor torque, power delivered, input pf, etc.
What is the method for speed control of dc series motor using a dc chopper?
Concept of Regenerative braking.
Regenerating braking of a chopper fed dc motor
Find speed range, minimum and maximum braking speeds.
Comparison of two quadrant and four quadrant drives.
What are ac drives?
Comparison of ac drives and dc drives.
Techniques for speed control of 3 phase induction motor.
Discuss the following: Stator voltage control, stator frequency control, stator voltage and frequency control, stator current, static rotor resistance control.
What is volts / hertz control for 3 phase induction motor? Two important inverter circuits used for it
Speed Torque characteristics of a 3 phase induction motor. What are the three regions obtained from the characteristics?
Draw the Ward – Leonard type of characteristics of 3 phase induction motor
What is Static Kramer Drive and Static Scherbius Drive?
Find the expression for power developed in terms of excitation voltage, load angle, etc. in
i) Salient pole
ii) Cylindrical motor
iii) Reluctance motors
iv) Permanent magnet types of synchronous motors