AC DC MOTOR DRIVES - Practice Mode

1) What is the function of power controller in drive circuits?

It sounds an alarm in no load conditions It detects the overloading condition of motor It reduce motor current during transient operation It maintain the torque at low voltage conditions

Correct Answer: It detects the overloading condition of motor

2) Why it is necessary to keep V/F ratio constant in a drive?

Keep the stator flux maximum Maintain the rotor current minimum Maintain the speed of motor constant Maintain the rated torque at all speeds

Correct Answer: Maintain the rated torque at all speeds

3) Which power modulator used in the electric drive system?

Cyclo converters Frequency multiplier Phase sequence indicator Servo controlled voltage stabilizer

Correct Answer: Cyclo converters

4) Which type of sensing unit employed in drive system?

Opto coupler Speed sensing Photo voltaic cell Resistance temperature detector

Correct Answer: Speed sensing

5) Which type of machine in industries is provided with multi motor electric drive?

Rolling machine Air Compressor Shearing machine Heavy duty electric drilling machine

Correct Answer: Rolling machine

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