CONTROL PANEL WIRING - Quiz

1) Which is the correct sequence operation of contactors for operating automatic star delta starter?

Main-Star-Delta-Timer Star- Main-Timer-Delta Main-Timer-Delta-Star Star-Timer-Main-Delta

2) Why control panels are provided with control transformer?

To maintain rated voltage to load To operate the auxiliary circuits To maintain rated main supply voltage To supply reduced voltage to power circuit

3) What happens, if time delay relay of a auto star delta starter still in closed condition after starting?

Starts and stop Runs normally Runs in star only Runs in delta only

4) What is the use of PVC channel in a control panel wiring?

Mounting MCB Mounting relays Path way for electrical wiring and protection Mounting double deck terminal contactor

5) What is the purpose of thermal over load relay in control panel?

Switching ON/OFF the circuit Protect the circuit from earth fault Control the circuit based on time delay Protect the motor from over heating and loading|