When load on an over-excited or under excited synchronous*motor is increased, rate of change of its armature current as compared with that of power factor is___________?

A. no-load and greatly over-excited fields
B. no-load and under-excited fields
C. normal load with minimum excitation
D. normal load with zero excitation

A. d.c. shunt motor
B. d.c. series motor
C. d.c. compound motor
D. induction motor
E. synchronous motor

A. the armature current is maximum
B. the armature current is minimum
C. the armature current is zero
D. none of the above

A. remain same
B. go down
C. improve
D. none of the above

A. armature current and power factor
B. terminal voltage and load factor
C. power factor and field current
D. field current and armature current

A. stop
B. run as induction motor
C. function as static condenser
D. burn with dense smoke