CONTROL PANEL WIRING - Practice Mode

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

Correct Answer: Star- Main-Timer-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

Correct Answer: To operate the auxiliary circuits

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

Correct Answer: 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

Correct Answer: Path way for electrical wiring and protection

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|

Correct Answer: Protect the motor from over heating and loading|

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