Electrical Machines In a dc machine 72 number of coils are used. Find the number of commutator segments required? 36 74 72 37 36 74 72 37 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 1, 4 1, 3, 5 2, 4 ,5 2, 3 , 5 1, 4 1, 3, 5 2, 4 ,5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will deteriorate and the speed rises. improve and the speed rises. improve and the speed falls. deteriorate and the speed falls. deteriorate and the speed rises. improve and the speed rises. improve and the speed falls. deteriorate and the speed falls. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Due to magnetic saturation, the flux per pole in a DC machine without brush shift increases in both the generators and the motors with load. decreases in generators and increases in motor with load. increases in generators but decreases in motor with load. decreases in both generators and the motors with load. increases in both the generators and the motors with load. decreases in generators and increases in motor with load. increases in generators but decreases in motor with load. decreases in both generators and the motors with load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC Shunt Motor the speed can be increased by Increasing the field current. Increasing the armature current. Decreasing the field current. Increasing the field current. Increasing the field current. Increasing the armature current. Decreasing the field current. Increasing the field current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency? 60 Hz. 0.70 Hz. 0.75 Hz. 0.65 Hz. 60 Hz. 0.70 Hz. 0.75 Hz. 0.65 Hz. ANSWER DOWNLOAD EXAMIANS APP
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