ELECTRICIAN 2nd YEAR MODULE – Control Panel Wiring ONLINE TEST

Question 1 of 37

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

Cotton ties

Nylon ties

Silk ties

P.V.C ties

Question 1 of 37

Question 2 of 37

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

Thimble

Grommet

Lugs

Terminal connector

Question 2 of 37

Question 3 of 37

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

DIN rails

Race ways

Grommets

G channel

Question 3 of 37

Question 4 of 37

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

To share more loads

To increase the accuracy of operation

To minimize the operating cost

To reduce power consumption

Question 4 of 37

Question 5 of 37

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

Time delay relay

Isolating switch

Miniature circuit breaker

Thermal overload relay

Question 5 of 37

Question 6 of 37

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

Timer

Control transformer

Relays

Contactor

Question 6 of 37

Question 7 of 37

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

Mounting double deck terminal contactor

Mounting relays

Mounting MCB

Pathway for electrical wiring and protection

Question 7 of 37

Question 8 of 37

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

To supply the power to the auxiliary circuits

To control the supply voltage to the contactor

To maintain constant terminal voltage

To protect the control elements from over voltage fault

Question 8 of 37

Question 9 of 37

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

Main→Star→Delta→Timer

Star→Main→Timer→Delta

Star→Timer→Main→Delta

Main→Timer→Delta→Star

Question 9 of 37

Question 10 of 37

10. Which switch is operated at OFF load condition?

Limit switch

Push button switch

Isolating switch

Two way switch

Question 10 of 37

Question 11 of 37

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

To reduce heat

To increase the insulation resistance

To increase the current carrying capacity

To reduce the radio interference

Question 11 of 37

Question 12 of 37

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

Switching ON/OFF the circuit

Protect the motor from over heating and loading

Control the circuit based on time delay

Protect the circuit from earth fault

Question 12 of 37

Question 13 of 37

13. Why are control panels provided with control transformer?

To supply reduced voltage to power circuit

To operate the auxiliary circuits

To maintain rated main supply voltage

To maintain rated voltage to load

Question 13 of 37

Question 14 of 37

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

AC₂

AC ₃

AC₄

AC₁

Question 14 of 37

Question 15 of 37

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

It provides a pathway for electrical wiring

Mounting the control accessories without screws

Install the high powered circuit accessories

Mounting the double deck terminal connectors

Question 15 of 37

Question 16 of 37

16. Which circuit uses limit switches?

Lift circuits

Motor control circuits

Street lighting

Domestic power circuits

Question 16 of 37

Question 17 of 37

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

G. channel

PVC channel

Grommets

DIN Rail

Question 17 of 37

Question 18 of 37

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

Bronze

Copper

Brass

Silver

Question 18 of 37

Question 19 of 37

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

Push button switch

Isolating switch

Toggle switch

Limit switch

Question 19 of 37

Question 20 of 37

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

For fixing relays

For fixing instruments

For fixing contactors

For fixing terminal connectors

Question 20 of 37

Question 21 of 37

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

By using Grommets

By using cable binding straps

By providing nylon cable ties

By using sleeve

Question 21 of 37

Question 22 of 37

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

Main contact

Stop button

Start button

Auxiliary contact

Question 22 of 37

Question 23 of 37

23. 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 23 of 37

Question 24 of 37

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

As per supply voltage

As per rated current

As per the type of supply

As per no volt coil rating

Question 24 of 37

Question 25 of 37

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

Electro mechanical relay

Thermal relay

Limit switch

Rectifier

Question 25 of 37

Question 26 of 37

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

By operating electromagnet to change the position

By manual operation

By using bimetallic strip to change the position

By mechanical settings

Question 26 of 37

Question 27 of 37

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

Stop button

No volt coil

Over load relay trip

Contactor

Question 27 of 37

Question 28 of 37

28. What is the criteria to select the contactor?

Type of load connected

Supply voltage and load

Type of supply

Place of use the contactor

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

Lugs and thimbles

Cable binding straps and button

Sleeves

Question 29 of 37

Question 30 of 37

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

Single phase AC system

Supply AC system 3 phase

Apparatus AC system 3 phase

Supply DC 3 wire system

Question 30 of 37

Question 31 of 37

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

Starting and stopping of shunt motor

Starting and stopping of series motor

Starting and stopping with inching and braking

Resistive loads except motor loads

Question 31 of 37

Question 32 of 37

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

Controls machine from over loading

Controls machine from over speed

Controls machine from over heat

Controls distance movement of any machine

Question 32 of 37

Question 33 of 37

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

No volt coil is not energized

Fault in forward contactor

Due to interlock in reverse contactor

No voltage exist in reverse contactor

Question 33 of 37

Question 34 of 37

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

Runs normally

Starts and stop

Runs in star only

Runs in delta only

Question 34 of 37

Question 35 of 37

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

Control the stray field in the panel

Ensure one earthing in case of other failure

Reduce the voltage drop in panel board

Panel board is made in metal box

Question 35 of 37

Question 36 of 37

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

Sensors

Isolating switch

Indicating lamp

Push button switch

Question 36 of 37

Question 37 of 37

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

Wire sleeves

Cable binding strap

Nylon cable ties

Wire ferrules

Question 37 of 37