Reversible motor has a built-in simple brake so it can stop and switch the direction in relatively short time. Reversible motor is the suitable model for applications where the motor switchs direction frequently. operation that changes the rotational direction frequently from. normal to reverse, and vice versa. Therefore, this motor is called. a reversible motor. In theory they are, but some may be more difficult, for instance if the connections to the windings are not accessible. A shaded pole motor would have to be disassembled, and the core reversed.
A change which can happen backward, that is, can be reversed is called a reversible change. A reversible function is defined as a bijective mapping f:A^n \rightarrow A^n, where A is any finite set of elements which can be conveniently identified with non-negative integers \{0, 1,\dots , p-1\}. In particular, for p = 2 and p = 3, we speak about binary or Boolean and ternary reversible functions, respectively.
The correct answer for this question is Option 2: shaded pole motor. In order to send the motor in the reverse direction, the forward coil must be de-energized. To do this, the stop button must be pressed, then the reverse pushbutton will be able to energize the reverse coil. Processes such as melting, boiling, evaporation, freezing, condensation, dissolution are reversible changes. A few examples are melting of wax, freezing of ice, and boiling water which evaporates as steam and condenses back to water.
