1. A rotor-resistance starter for a three-phase wound-rotor induction motor
(a) adds external resistance to the wound rotor via sliprings
(b) is connected in series with the machine stator
(c) can only be used in conjunction with a double-cage rotor
(d) applies only to DC motors
2. A large synchronous motor is often started by
(a) connecting it directly to the three-phase supply
(b) pushing the rotor in the required direction before connecting the supply
(c) running it up to speed using a ‘pony’ motor before energising the rotor
(d) first switching on the rotor supply then applying the stator voltage
3.A single-phase induction motor
(a) can only be used for loads rated at less than 0.5 kW
(b) will run in whichever direction the rotor is….