Question 1
The preferred method of speed control for an induction motor is to alter the
◦
voltage applied to the motor.
◦
resistance in series with the motor.
◦
frequency of the supply voltage.
◦
number of motor stator poles.
Question 2
The purpose of a truth table is
◦
to show all possible combinations of inputs to s digital circuit and the resulting output.
◦
to explain the internal construction of a digital logic circuit.
◦
to prove which outputs are true and which are false.
◦
to be sealed inside a gate or memory.