Electrical Machines In a step down transformer which one of the following statements is true? Number of secondary turns is more than that of primary. Secondary current is less than primary current. Secondary power is less than primary power. Number of secondary turns is less than primary turns. Number of secondary turns is more than that of primary. Secondary current is less than primary current. Secondary power is less than primary power. Number of secondary turns is less than primary turns. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature of a DC motor is laminated to reduce eddy current loss. hysteresis loss. copper loss. friction and windage loss. eddy current loss. hysteresis loss. copper loss. friction and windage loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips? 0.04, 0.96 0.04, 1.96 0.02, 0.98 0.02, 1.98 0.04, 0.96 0.04, 1.96 0.02, 0.98 0.02, 1.98 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW? 45 HZ 48.5 Hz 50 Hz 48 Hz 45 HZ 48.5 Hz 50 Hz 48 Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a DC compound motor can be reversed by interchanging armature connections. series field connections. shunt field connections. armature or field connections. armature connections. series field connections. shunt field connections. armature or field connections. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The fall in speed of the DC generator due to increase in load can be corrected by increasing the input to the prime mover. cooling the armature. reducing the load voltage. increasing the excitation. increasing the input to the prime mover. cooling the armature. reducing the load voltage. increasing the excitation. ANSWER DOWNLOAD EXAMIANS APP
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