Electrical Engineering MCQ on When rotor speed in synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop
Electrical Engineering MCQ on Shaft of synchronous motor is made of
Electrical Engineering MCQ on The synchronous motor is not inherently self-starting since
Electrical Engineering MCQ on The armature current in a synchronous motor, has large values for
Electrical Engineering MCQ on The synchronous motor can develop synchronous torque
Electrical Engineering MCQ on Certain synchronous motor connected to infinite bus-bars has a constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have
Electrical Engineering MCQ on The duration of sudden short-circuit test on a synchronous motor is generally about
Electrical Engineering MCQ on The loss in a synchronous motor that does not vary with load
The temperature at which resistance of conductors becomes double to its resistance at 0°C is: 1/α0 °C 3/α0 °C 1/(1+ α0) °C α0 °C Correct answer: 1. 1/α0 °C Explanation Rt= R0 (1+ α0 t) Here it is known that Rt= 2.R0 2R0= R0 (1+ α0 t) Or t = 1/α0°C
The mass of proton as compared to the mass of electron is: Identical Less than About 1837 times About 50000 times Correct answer: 3. About 1837 times