ELECTRICIAN 2nd YEAR MODULE – Control Panel Wiring ONLINE TEST

Question 1 of 37

1. Which switch with an actuator is operated by the motion of a machine or part of an object?

Toggle switch

Limit switch

Isolating switch

Push button switch

Question 1 of 37

Question 2 of 37

2. What is the name of the accessory used in control panel wiring?

Wire sleeves

Cable binding strap

Nylon cable ties

Wire ferrules

Question 2 of 37

Question 3 of 37

3. How to protect the cable from insects and rats into the panel?

By using Grommets

By using sleeve

By using cable binding straps

By providing nylon cable ties

Question 3 of 37

Question 4 of 37

4. Which switch is operated at OFF load condition?

Two way switch

Limit switch

Push button switch

Isolating switch

Question 4 of 37

Question 5 of 37

5. Why power and control wirings run in separate race ways?

To reduce the radio interference

To increase the insulation resistance

To increase the current carrying capacity

To reduce heat

Question 5 of 37

Question 6 of 37

6. What is the use of 'G' channels in control panel?

For fixing instruments

For fixing relays

For fixing terminal connectors

For fixing contactors

Question 6 of 37

Question 7 of 37

7. What happens if time delay relay of an auto star-delta starter remains in closed condition after starting?

Runs in star only

Runs in delta only

Starts and stop

Runs normally

Question 7 of 37

Question 8 of 37

8. Which circuit uses limit switches?

Lift circuits

Street lighting

Motor control circuits

Domestic power circuits

Question 8 of 37

Question 9 of 37

9. Why is sequential control of motors required in industrial applications?

To reduce power consumption

To minimize the operating cost

To increase the accuracy of operation

To share more loads

Question 9 of 37

Question 10 of 37

10. What is the function of limit switch in control panel wiring?

Controls machine from over loading

Controls distance movement of any machine

Controls machine from over speed

Controls machine from over heat

Question 10 of 37

Question 11 of 37

11. What is the name of the device marked as 'X' in the circuit?

No volt coil

Stop button

Over load relay trip

Contactor

Question 11 of 37

Question 12 of 37

12. Which device protects from overload and short circuit in a panel board?

Isolating switch

Miniature circuit breaker

Thermal overload relay

Time delay relay

Question 12 of 37

Question 13 of 37

13. What essential feature to be considered while designing a layout of control panel?

Outside dimensions and swing area of cabinet door

Proper type of protection and measuring system

Inside area and number of indicating lights in front panel

Suitable method of labelling and cable harnessing

Question 13 of 37

Question 14 of 37

14. What is the purpose of control transformer used in control panel wiring?

To protect the control elements from over voltage fault

To maintain constant terminal voltage

To supply the power to the auxiliary circuits

To control the supply voltage to the contactor

Question 14 of 37

Question 15 of 37

15. Which device controls the operations in sequential control systems?

Timer

Contactor

Relays

Control transformer

Question 15 of 37

Question 16 of 37

16. Which device is avoided in the panel board assembly?

Push button switch

Isolating switch

Sensors

Indicating lamp

Question 16 of 37

Question 17 of 37

17. What is the name of the accessory used in control panel wiring?

Lugs

Grommet

Terminal connector

Thimble

Question 17 of 37

Question 18 of 37

18. Which cable ties are used to bunch the wires?

Cotton ties

Silk ties

P.V.C ties

Nylon ties

Question 18 of 37

Question 19 of 37

19. Which DC load is represented by the DC4 standard duty cycle of contactors?

Resistive loads except motor loads

Starting and stopping with inching and braking

Starting and stopping of series motor

Starting and stopping of shunt motor

Question 19 of 37

Question 20 of 37

20. Which type of device protects motors from over heating and over loading in a panel board?

Limit switch

Rectifier

Electro mechanical relay

Thermal relay

Question 20 of 37

Question 21 of 37

21. What is the purpose of DIN-rail used in control panel wiring?

Mounting the double deck terminal connectors

It provides a pathway for electrical wiring

Install the high powered circuit accessories

Mounting the control accessories without screws

Question 21 of 37

Question 22 of 37

22. Why are control panels provided with control transformer?

To operate the auxiliary circuits

To maintain rated main supply voltage

To maintain rated voltage to load

To supply reduced voltage to power circuit

Question 22 of 37

Question 23 of 37

23. Which is the standard duty cycle code of the contactor for starting and stopping the AC resistive and inductive load?

AC ₃

AC₂

AC₁

AC₄

Question 23 of 37

Question 24 of 37

24. Which supply is indicated by the color of conductor exhibited on Red, Blue and Black?

Supply AC system 3 phase

Single phase AC system

Supply DC 3 wire system

Apparatus AC system 3 phase

Question 24 of 37

Question 25 of 37

25. What is the reason for providing two separate Earthings in panel board?

Panel board is made in metal box

Ensure one earthing in case of other failure

Control the stray field in the panel

Reduce the voltage drop in panel board

Question 25 of 37

Question 26 of 37

26. What is the name of the wiring accessory used in control panel wiring?

Grommets

G channel

DIN rails

Race ways

Question 26 of 37

Question 27 of 37

27. Which is the correct sequence operation of contactors for operating automatic star-delta starter?

Main→Star→Delta→Timer

Main→Timer→Delta→Star

Star→Timer→Main→Delta

Star→Main→Timer→Delta

Question 27 of 37

Question 28 of 37

28. What is the purpose of thermal overload relay in control panel?

Protect the circuit from earth fault

Switching ON/OFF the circuit

Control the circuit based on time delay

Protect the motor from over heating and loading

Question 28 of 37

Question 29 of 37

29. Which device prevents flare out of stripped and stranded cables in the panel board?

Wire ferrules

Cable binding straps and button

Sleeves

Lugs and thimbles

Question 29 of 37

Question 30 of 37

30. What is the name of the device marked as 'X'?

Main contact

Stop button

Auxiliary contact

Start button

Question 30 of 37

Question 31 of 37

31. Which material is used to make open frame bimetallic adjustable thermostat contacts?

Bronze

Silver

Brass

Copper

Question 31 of 37

Question 32 of 37

32. Which accessory is used to mount MCB, OLR in the panel board without using screws?

DIN Rail

G. channel

Grommets

PVC channel

Question 32 of 37

Question 33 of 37

33. What is the use of PVC channel in a control panel wiring?

Pathway for electrical wiring and protection

Mounting relays

Mounting MCB

Mounting double deck terminal contactor

Question 33 of 37

Question 34 of 37

34. Why the motor is not changing the direction, if reverse push button is pressed in forward and reverse control star delta starter?

Due to interlock in reverse contactor

No voltage exist in reverse contactor

No volt coil is not energized

Fault in forward contactor

Question 34 of 37

Question 35 of 37

35. How should control circuit voltage and power in a contactor be selected?

As per rated current

As per the type of supply

As per supply voltage

As per no volt coil rating

Question 35 of 37

Question 36 of 37

36. What is the criteria to select the contactor?

Place of use the contactor

Type of load connected

Type of supply

Supply voltage and load

Question 36 of 37

Question 37 of 37

37. How are the contacts in a contactor engaged for working?

By mechanical settings

By manual operation

By operating electromagnet to change the position

By using bimetallic strip to change the position

Question 37 of 37