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 coil resistance. reactance voltage induced in the coil. None of these armature emf. coil resistance. reactance voltage induced in the coil. None of these armature emf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an alternator the voltage generated per phase is proportional to All of these number of turns in coil. frequency of waveform. flux per pole. All of these number of turns in coil. frequency of waveform. flux per pole. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in delta. star. None of these delta or star according to need. delta. star. None of these delta or star according to need. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is 6 ohms. 2.2 ohms. 1.9 ohms. 5.7 ohms. 6 ohms. 2.2 ohms. 1.9 ohms. 5.7 ohms. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In auto transformer if the turn ratio is K, what is the power transferred inductively? both A and B None of these (1-K) × input power K × input power both A and B None of these (1-K) × input power K × input power ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The change in speed of a DC generator due to increased load is corrected by increasing terminal voltage. increasing input power of the prime mover. increasing armature cooling. increasing armature resistance. increasing terminal voltage. increasing input power of the prime mover. increasing armature cooling. increasing armature resistance. ANSWER DOWNLOAD EXAMIANS APP
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