Electrical Machines Commutator pitches of duplex and simplex lap windings are respectively 2 and 1 2 and 2 4 and 2 4 ang 1 2 and 1 2 and 2 4 and 2 4 ang 1 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In salient pole synchronous machine, the reluctance power varies as cosδ sin2δ cos2δ sinδ cosδ sin2δ cos2δ sinδ ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Maximum allowable acidity level of power transformer insulating oil is generally taken as 1 mg of KOH / gm. 2 mg of KOH / gm. 0.5 mg of KOH / gm. 0.3 mg of KOH / gm. 1 mg of KOH / gm. 2 mg of KOH / gm. 0.5 mg of KOH / gm. 0.3 mg of KOH / gm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is 36.36% decrease 18.18% increase 36.36% increase 36.36% increase 36.36% decrease 18.18% increase 36.36% increase 36.36% increase ANSWER DOWNLOAD EXAMIANS APP
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, 7. 3. 12. 4. 7. 3. 12. 4. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ? 1 and 4 2, 3 and 4 1, 2 and 5 3 and 5 1 and 4 2, 3 and 4 1, 2 and 5 3 and 5 ANSWER DOWNLOAD EXAMIANS APP
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