Electrical Machines It is an advisable to use auto transformer if the transformation ratio is 0.5. 0.25. Greater than 1. near to 1. 0.5. 0.25. Greater than 1. near to 1. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In which of the following DC Motor the ratio of starting torque to full load torque is minimum? Shunt motor. Series motor. Differential compound motor. Cumulative compound motor. Shunt motor. Series motor. Differential compound motor. Cumulative compound motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following DC Motor uses 4-point starter? DC shunt motor with field weaking control. DC series motor. DC shunt motor with armature resistance. DC compound motor. DC shunt motor with field weaking control. DC series motor. DC shunt motor with armature resistance. DC compound motor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For higher values of armature, the speed of a DC series motor is Inversely proportional to armature current. Proportional to armature current. Proportional to the square of armature current. Constant. Inversely proportional to armature current. Proportional to armature current. Proportional to the square of armature current. Constant. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The oscillation in a synchronous motor can be damped out by running the motor on leading power factors. oscillation cannot be damped. providing damper bars in the rotor pole faces. maintaining constant excitation. running the motor on leading power factors. oscillation cannot be damped. providing damper bars in the rotor pole faces. maintaining constant excitation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are 2, 3 , 5 2, 4 ,5 1, 4 1, 3, 5 2, 3 , 5 2, 4 ,5 1, 4 1, 3, 5 ANSWER DOWNLOAD EXAMIANS APP
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