DC MOTOR - Practice Mode

1) Which rule determines the direction of current in D.C motor?

Right hand grip rule Right hand palm rule Fleming's left hand rule Fleming's right hand rule

Correct Answer: Fleming's right hand rule

2) Which rule is applied to identify the direction of flux in DC motor?

Cork's screw rule Right hand grip rule Fleming's left hand rule Fleming's right hand rule

Correct Answer: Fleming's left hand rule

3) What is the name of winding, if coil pitch is less than pole pitch?

Full pitch winding Half pitch winding Long chorded winding Short chorded winding

Correct Answer: Short chorded winding

4) What is the purpose of series resistor connected with holding coil in a D.C four point starter?

Limit the current in holding coil Increase the current in holding coil Increase the voltage in holding coil Decrease the voltage in holding coil

Correct Answer: Limit the current in holding coil

5) Which speed control method of D.C series motor is used for electric train?

Field diverter method Field tapping method Armature diverter method Supply voltage control method

Correct Answer: Field diverter method

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