100-120

What is the primary function of a motor protection circuit breaker (MPCB)?

• All of the above

• Turning motors off and on

• Thermal motor protection

• Short circuit protection

. How does a thermistor-type protection unit monitor temperature in MCCBs?

• Via a PTC resistor on motor windings

• By measuring current flow

• Using an external temperature sensor

• By detecting voltage fluctuations

. What is the primary function of a soft starter?

• To switch the motor on and off.

• To protect against short circuits

• To control the frequency of the motor

• To reduce mechanical torque to the load

What is the purpose of a variable speed drive (VSD)?

• To protect against overload

• To reduce starting current peaks

• To alter the motor speed by changing the frequency

• To control the motor’s torque

. What is the primary function of a load-break switch?

• To provide overload protection

• To make, carry, and break currents

• To protect against short circuits

• To operate as a manual disconnect switch

How does a fuse protect an electrical circuit?

• By short-circuiting the circuit

• By increasing the circuit’s resistance

• By melting when too much current flows

• By regulating the voltage

. What does an analog electronic signal represent?

• Digital information

• A constant voltage

• A voltage or current proportional to a measurement

• A binary code

. What is the main advantage of using a loop calibrator for troubleshooting current loops?

• It is more accurate for measuring very small currents

• It is more affordable than other measurement tools

• It can both measure and source current in the loop.

• It is easier to use than a clamp-on milliammeter.

What is the main purpose of calibration for an instrument?

• To ensure accurate correspondence between input and output signals

• To improve the sensitivity of the instrument

• To diagnose any internal faults in the instrument.

• To adjust the instrument's range of measurement.

What does "ranging" an instrument involve?

• Adjusting the instrument's internal components for optimal performance

• Verifying the instrument's compliance with safety regulations.

• Setting the zero point of the measurement scale

• Defining the desired sensitivity to input changes