Electrician 3rd sem DC Motor

Which instrument is used to measure armature winding resistance?

• Megger

• Multimeter

• Series type Ohm meter

• Kelvin bridge

Which instrument is used to test armature winding for short and open circuit?

• Tong Tester

• Internal Growler

• External Growler

• Digital multimeter

What is the name of the speed control method of DC motor?

• Field diverter method

• Field tapping method

• Voltage control method

• Armature diverter method

Which winding wire is used for DC field coil?

• Super enamelled copper wire

• Single silk covered copper wire

• Double silk covered copper wire

• PVC covered copper winding wire

Which formula is used to calculate the speed of DC motor?

How many parallel paths in duplex lap winding in the armature of 4 pole D.C Motor?

• 2

• 4

• 6

• 8

Which rule determines the direction of rotation of armature in D.C motor?

• Right hand grip rulee

• Right hand palm rule

• Fleming’s left hand rule

• Fleming’s right hand rule

What is the name of D.C motor?

• D.C shunt motor

• D.C series motor

• D.C differential compound motor

• D.C cumulative compound motor

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

What is the formula to calculate the current taken by D.C shunt motor armature?