Electrical Machines Which of the following DC Motor is used in paper machines? Separately excited DC motor. DC series motor. DC Shunt motor. DC compound motor. Separately excited DC motor. DC series motor. DC Shunt motor. DC compound motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is 2, 4 1, 4 1, 3 2, 3 2, 4 1, 4 1, 3 2, 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the field of a dc shunt motor gets opened while the motor is running, then the motor will become slow. armature will oscillate about original speed as the mean speed armature current will drop motor will attain dangerously high speed motor will become slow. armature will oscillate about original speed as the mean speed armature current will drop motor will attain dangerously high speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following methods are used to control the speed of DC motors is supply voltage control armature circuit resistance control All of these field current control supply voltage control armature circuit resistance control All of these field current control ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For P pole machine relation between electrical degrees and mechanical degrees is θelec = 2/P*θmech θelec = 4/P*θmech θelec = P/2*θmech θelec = θmech θelec = 2/P*θmech θelec = 4/P*θmech θelec = P/2*θmech θelec = θmech ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The demagnetising component of armature reaction in a DC generator results in sparking trouble. reduces inter poles flux density. increases armature speed. reduces generator emf. results in sparking trouble. reduces inter poles flux density. increases armature speed. reduces generator emf. ANSWER DOWNLOAD EXAMIANS APP
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