(Solved): True or False  Since an induction motor naturally draws currents during full-voltage startup th ...

Since an induction motor naturally draws currents during full-voltage startup that are much larger than rated current, a thermal overload relay operates on an inverse time-curve to prevent the relay from immediately shutting-down the motor during a full-voltage startup. The resistors utilized within a series-resistance motor starter can be replaced by either a similarly-sized (in terms of their impedance) set of inductors or capacitors and the starter will still be able to properly limit the amount of current drawn by the motor at startup. A series-resistance starter attempts to start a motor by initially supplying the motor through a set of series-connected resistors and then bypassing the resistors once the motor has accelerated to the point where it no longer draws excessively large currents. Although the heaters utilized within an overload relay will produce heat whenever their protected motor is operating, if sized properly, they should only overheat and trip the relay if the motor they are protecting draws currents that are greater-than its locked-rotor current. While an induction motor is driving a mechanical load, a decrease in the load torque provided by its mechanical load will result in an increase in the speed of the motor and a decrease in the magnitude of the line currents drawn by the motor. When pressing one of the combination pushbuttons in the Q-215 lab that contain both a NO contact and a NC contact, the pushbutton's NC contact is actuated open slightly before its NO contact is actuated closed. A typical 3 (D) contactor used in a motor-starter contains three normally-open (NO) main contacts and at least one normally-closed \( (\mathrm{NC}) \) auxiliary contact. A motor-starter's overload relay must contain at least one NO contact that can be wired in-series with the "main" contactor's field coil such that, when the relay trips due to an overload, the NO contact closes and de-energizes the field coil, in-turn stopping the motor. Contactors are designed to energize and de-energize motors (or other high-current loads) during both times of normal operation and times of abnormal operation such as a locked rotor, but not during the occurrence of a fault (short-circuit) in the supply circuit. When started with rated-voltage supplied to its terminals, a 3 ? Induction Motor will dra a starting current that is typically \( 40 x-100 x \) greater than its rated current.