Electrical Machines The basic function of a transformer is to change the power level the frequency the power factor the level of the voltage the power level the frequency the power factor the level of the voltage ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased both power angle and power factor decrease power angle decrease and power factor increase power angle increase and power factor decrease both power angle and power factor increase both power angle and power factor decrease power angle decrease and power factor increase power angle increase and power factor decrease both power angle and power factor increase ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the mechanical power developed by a DC series motor is maximum? Back emf is equal to half the applied voltage. Back emf is equal to applied voltage. None of above. Back emf is equal to zero. Back emf is equal to half the applied voltage. Back emf is equal to applied voltage. None of above. Back emf is equal to zero. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The damper windings also called the squirrel cage windings or damper grids both (A) and (B). consists of short-circuited copper bars embedded in the field pole faces. are provided on the stator for improving power factor. are provided in a synchronous motor to make it self starting. both (A) and (B). consists of short-circuited copper bars embedded in the field pole faces. are provided on the stator for improving power factor. are provided in a synchronous motor to make it self starting. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is 200Hz. 50Hz. 150Hz. 100Hz. 200Hz. 50Hz. 150Hz. 100Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature shaft must be able to with stand Twisting stains due to transmission of torque. All of these Bending moment due to weight of the armature. Any unbalanced magnetic pull on the armature core. Twisting stains due to transmission of torque. All of these Bending moment due to weight of the armature. Any unbalanced magnetic pull on the armature core. ANSWER DOWNLOAD EXAMIANS APP
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