Electrical Machines If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be, 4. 7. 12. 3. 4. 7. 12. 3. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of 1.5Hz 2.5Hz 48.5Hz 51.5Hz 1.5Hz 2.5Hz 48.5Hz 51.5Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following transformer insulating oil generally used in India? Naphtha based insulating oil. Olefin based insulating oil. Paraffin based insulating oil. Aromatics based insulating oil. Naphtha based insulating oil. Olefin based insulating oil. Paraffin based insulating oil. Aromatics based insulating oil. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The reduced air gap results in an increase starting torque. power factor. breaking torque. cost of operation. starting torque. power factor. breaking torque. cost of operation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the reason for stationary armature essential in alternators above 5 KVA? All of these Insulation requirement is less. Collecting of large current is simple. Operating cost is less. All of these Insulation requirement is less. Collecting of large current is simple. Operating cost is less. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively? 4 KVA 0 KVA 10 KVA 6 KVA 4 KVA 0 KVA 10 KVA 6 KVA ANSWER DOWNLOAD EXAMIANS APP
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