Explanation: When θr=0, the flux linkages with the rotor are maximum, and this is indicated by a maximum voltmeter reading. 2. Consider a single phase synchronous machine of cylindrical rotor type. A single phase supply is given to the stator winding, and a voltmeter is connected across rotor winding. For what value of θr the voltmeter reads a zero?
A. 0°
B. 30°
C. 45°
D. 90°
Answer:A
Explanation: When θr=0, the flux linkages with the rotor are maximum, and this is indicated by a maximum voltmeter reading. 2. Consider a single phase synchronous machine of cylindrical rotor type. A single phase supply is given to the stator winding, and a voltmeter is connected across rotor winding. For what value of θr the voltmeter reads a zero?
A. 0° B. 30° C. 45° D. 90°
Explanation: When θr=90°, the voltmeter reading is zero, because the stator winding axis is perpendicular to the rotor winding axis, and the mutual inductance Msr is zero.