A synchronous motor develops maximum power when load angle is
A). 45°
B). 60°
C). 90°
D). 120°
In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then
A). the motor is said to be fully loaded
B). the torque generated is maximum
C). the excitation is said to be zero per cent
D). the excitation is said to be hundred per cent
If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately___________
A). 500
B). 100
C). 1000
D). 5000
If voltage feedback (negative) is applied to an amplifier, its output impedance ___________
A). Remains the same
B). Is increased
C). Is decreased
D). None of the above
When current feedback (negative) is applied to an amplifier, its input impedance ___________
A). Is decreased
B). Is increased
C). Remains the same
D). None of the above