5.1 The full-load torque angle of a synchronous motor at rated voltage and frequency is 33 electrical degrees. Neglect the effects of armature resistance and leakage reactance. If the field current is held constant, calculate the full- load torque angle following the following changes in operating conditions? a) Frequency reduced 8 percent, load torque and applied voltage constant. b) Frequency reduced 8 percent, load power and applied voltage constant. c) Both frequency and applied voltage reduced 8 percent, load torque constant. d) Both frequency and applied voltage reduced 8 percent, load power constant. 14 T W X Di