DC MOTOR - Practice Mode

1) What is the temperature value of class ?F? insulation?

90 Degree Centigrade 105 Degree Centigrade 120 Degree Centigrade 155 Degree Centigrade

Correct Answer: 155 Degree Centigrade

2) Which type of D.C motor is used for constant speed drives?

DC series motor DC shunt motor Differential long shunt compound motor Differential short shunt compound motor

Correct Answer: DC shunt motor

3) Which type of DC motor is used in elevators?

DC series motor DC shunt motor DC differential compound motor DC cumulative compound motor

Correct Answer: DC cumulative compound motor

4) Which method of speed control gives below the rated speed in DC series motor?

Field diverter method Tapped field method Voltage control method Armature diverter method

Correct Answer: Armature diverter method

5) What is the effect, if a four point starter resistance is cutoff during running?

Motor stopped Runs at slow speed Runs at very high speed Runs at reverse direction

Correct Answer: Runs at slow speed

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