Results
Q1. Synchronous motors are usually supplied by:
Correct answer is – three phase AC
Q2. Reversing two phases to a three phase motor will:
Correct answer is – cause the motor to run in reverse
Q3. A synchronous motor runs at a speed that depends upon the supply:
Correct answer is – frequency
Q4. If one phase of the supply to a three phase motor fails, then:
Correct answer is – will run at about half speed but will not start on its next selection
Q5. The basic principle of operation of a 3 phase induction motor is:
Correct answer is – a rotating field created in the stator
Q6. In an induction motor:
Correct answer is – AC is induced in the rotor
Q7. In a synchronous motor, the rotor is:
Correct answer is – energized by DC and it lines up with the magnetic field in the stator
Q8. An induction motor has:
Correct answer is – no slip ring or brushes
Q9. A squirrel cage rotor:
Correct answer is – is not connected to the supply
Q10. A starting circuit for a powerful single phase induction motor might be:
Correct answer is – a resistance / inductance starter
