Electrical Machines When flux density is constant in a transformer, hysteresis loss varies as f f² V² V f f² V² V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The demagnetising component of armature reaction in a DC generator reduces generator emf. reduces inter poles flux density. increases armature speed. results in sparking trouble. reduces generator emf. reduces inter poles flux density. increases armature speed. results in sparking trouble. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor None of these. Remains same. Increase. Decrease. None of these. Remains same. Increase. Decrease. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will worsen and terminal voltage will fall improve but terminal voltage will fall. improve and terminal voltage will rise . worsen and terminal voltage will rise. worsen and terminal voltage will fall improve but terminal voltage will fall. improve and terminal voltage will rise . worsen and terminal voltage will rise. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature resistance of the dc motor is generally of the range 0.1 ohm. 0.5 ohm. 50 ohm. 100 ohm. 0.1 ohm. 0.5 ohm. 50 ohm. 100 ohm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is 1/√3 √3 3 1/3 1/√3 √3 3 1/3 ANSWER DOWNLOAD EXAMIANS APP
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