Which of these uses a movable core to act as an electric switch?

Explain the various methods of heat transfer used in the heat exchanger system.

What will be an ideal response?

In a schematic, a wire is labelled "0.8 BLK/WHT." This wire is __________

A) White with a black stripe B) 0.8 mm diameter C) Both A and B D) Neither A nor B

Polarity of an electromagnet can be changed by ________

A) changing the amount of current flow through the coil of wire B) changing the frequency of the current flow through a coil of wire C) changing the direction of current flow through the coil of wire

A decrease in frequency produces a decrease in inductive reactance.

Answer the following statement true (T) or false (F)