Synchronous Motor

The field winding of the synchronous motor is on the..

• Rotor

• Stator

The armature winding is supplied by

• Single Phase AC Voltage

• Three Phase AC Voltages

• DC Voltage

Which of the following are the suitable types of rotor in synchronous motor?

• Salient Pole Rotor

• Squirrel Cage Rotor

• Cylindrical Rotor

Which winding produce the rotating magnetic field in synchronous motor?

• Field winding

• Compensating Winding

• Armature winding

Which formula is use to calculate the speed of the SM?

• $\frac{120f}{P}$

• $\frac{120P}{f}$

For the armature circuit of the SM which equation is correct?

• $V_T=EA-I_A\left(R_A+jX_s\right)$

• $V_T=EA+I_A\left(R_A+jX_s\right)$

If the field current kept constant which statement is correct

• $\left|E_A\right|$ is constant

• $\delta$ is constant

• $f$ is constant

Which of the following is the torque-speed curve of the synchronous motor?

• 
• 
• 

What does lagging power factor in SM means?

• $I_F$ lags $V_{\phi}$

• $I_F$ lags $V_F$

• $I_A$ lags $V_{\phi}$

• $V_{\phi}$ lags $I_A$

The angle  $\delta$  in SM always

• negative

• positive