(Solved): D When syachronous motors are loaded: (a) Speed remains constant (b) Speed increases (c) Speod decre ...

D When syachronous motors are loaded: (a) Speed remains constant (b) Speed increases (c) Speod decreases (d) Do not know Syachronous motors are ased in: (a) Low-torque applications (b) High precision applications (c) Production lines (d) None of the above The magnetic field generated by the rotor in syachronous motors is: (a) Time-varying (b) Constant (c) Rotating (d) None of the above Synchronous motors are self-starting because of the existence of: (a) de current in the rotor (b) Windings in the rotor (c) Squirrel cage arrangement in the rotor (d) None of the above Reasons of "out of syachronism" in synchronous motors include: (a) Motor overioad (b) Low sumply voltage (c) Low excitation voltage (d) All of the above Autotransformers are used: (a) In high power applications (b) To change voltage levels by a small amount. (c) To regulate the load voltage. (d) All of the above The no load test of a three-phase induction motor measures: (a) Input power (b) Magnetization characteristics (c) Rotational losses (d) None of the above When the slip of a three-phase induction motor is too small: (a) The rotor impedance is too low compared to the parallel impedance (b) The rotor impedance is too high compared to the parallel impedance (c) The rotor impedance is equal to the parallel impedance (d) Has no relation A wound-rotor induction motor operates with its slip rings shorted and with a

of the rated load. If the rotor resistance is doubled by inserting external resistors into the rotor circuit, the following will happen: (a) Slip decrease (b) Output power increases (c) RCL Power decrease (d) None of the above