Electrical Machines The field system of an alternator is usually excited 3 - Φ, 50 Hz and 400 V. 110 / 220 V AC. 230 V AC. 250 / 250 V DC. 3 - Φ, 50 Hz and 400 V. 110 / 220 V AC. 230 V AC. 250 / 250 V DC. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following bearings and their uses are correct roller bearings → large machines neither 1 nor 2 ball bearings → small machines both A and B roller bearings → large machines neither 1 nor 2 ball bearings → small machines both A and B ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The starting resistance of DC motor is generally Low. around 500 ohms. Infinitely large. 1000 ohms. Low. around 500 ohms. Infinitely large. 1000 ohms. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is 2, 3 1, 3 1, 4 2, 4 2, 3 1, 3 1, 4 2, 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the field current is reduced to zero the maximum power developed by alternator is 0.9103 KW. 5.46 KW. 1.644 KW. 2.73 KW. 0.9103 KW. 5.46 KW. 1.644 KW. 2.73 KW. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be 30° 36° 18° 72° 30° 36° 18° 72° ANSWER DOWNLOAD EXAMIANS APP
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