Electrical Machines Which of the following windings are necessary in case of all dc machines? lap winding closed winding open type winding wave winding lap winding closed winding open type winding wave winding ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to reactance voltage induced in the coil. None of these coil resistance. armature emf. reactance voltage induced in the coil. None of these coil resistance. armature emf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An inverted V curve of synchronous motor shows variation of supply voltage and field current at constant excitation. power factor and supply voltage during hunting. power factor and DC excitation at constant load. supply voltage and excitation current at constant load. supply voltage and field current at constant excitation. power factor and supply voltage during hunting. power factor and DC excitation at constant load. supply voltage and excitation current at constant load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the reason for stationary armature essential in alternators above 5 KVA? Collecting of large current is simple. Insulation requirement is less. All of these Operating cost is less. Collecting of large current is simple. Insulation requirement is less. All of these Operating cost is less. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The brushes of a DC machine should be placed on the armature midway between poles. commutator in the polar axis. commutator in the inter polar axis. armature in the polar axis. armature midway between poles. commutator in the polar axis. commutator in the inter polar axis. armature in the polar axis. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be A - C - B. B - C - A or C - A - B. B - C - A. C - A - B. A - C - B. B - C - A or C - A - B. B - C - A. C - A - B. ANSWER DOWNLOAD EXAMIANS APP
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