ELECTRICIAN 2nd YEAR MODULE – Control Panel Wiring ONLINE TEST

Question 1 of 37

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

Lugs and thimbles

Wire ferrules

Sleeves

Cable binding straps and button

Question 1 of 37

Question 2 of 37

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

Supply AC system 3 phase

Apparatus AC system 3 phase

Single phase AC system

Supply DC 3 wire system

Question 2 of 37

Question 3 of 37

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

By mechanical settings

By operating electromagnet to change the position

By manual operation

By using bimetallic strip to change the position

Question 3 of 37

Question 4 of 37

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

Cable binding strap

Nylon cable ties

Wire sleeves

Wire ferrules

Question 4 of 37

Question 5 of 37

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

Isolating switch

Push button switch

Toggle switch

Limit switch

Question 5 of 37

Question 6 of 37

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

To increase the current carrying capacity

To increase the insulation resistance

To reduce the radio interference

To reduce heat

Question 6 of 37

Question 7 of 37

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

Contactor

No volt coil

Over load relay trip

Stop button

Question 7 of 37

Question 8 of 37

8. 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 volt coil is not energized

Fault in forward contactor

No voltage exist in reverse contactor

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

Main→Timer→Delta→Star

Star→Timer→Main→Delta

Star→Main→Timer→Delta

Question 9 of 37

Question 10 of 37

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

Isolating switch

Sensors

Push button switch

Indicating lamp

Question 10 of 37

Question 11 of 37

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

Brass

Copper

Silver

Bronze

Question 11 of 37

Question 12 of 37

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

Outside dimensions and swing area of cabinet door

Suitable method of labelling and cable harnessing

Inside area and number of indicating lights in front panel

Proper type of protection and measuring system

Question 12 of 37

Question 13 of 37

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

For fixing instruments

For fixing contactors

For fixing relays

For fixing terminal connectors

Question 13 of 37

Question 14 of 37

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

Contactor

Control transformer

Relays

Timer

Question 14 of 37

Question 15 of 37

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

Rectifier

Electro mechanical relay

Thermal relay

Limit switch

Question 15 of 37

Question 16 of 37

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

Ensure one earthing in case of other failure

Panel board is made in metal box

Control the stray field in the panel

Reduce the voltage drop in panel board

Question 16 of 37

Question 17 of 37

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

To increase the accuracy of operation

To minimize the operating cost

To reduce power consumption

To share more loads

Question 17 of 37

Question 18 of 37

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

Race ways

G channel

Grommets

DIN rails

Question 18 of 37

Question 19 of 37

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

It provides a pathway for electrical wiring

Mounting the double deck terminal connectors

Install the high powered circuit accessories

Mounting the control accessories without screws

Question 19 of 37

Question 20 of 37

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

Starting and stopping of shunt motor

Resistive loads except motor loads

Starting and stopping of series motor

Starting and stopping with inching and braking

Question 20 of 37

Question 21 of 37

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

To supply the power to the auxiliary circuits

To protect the control elements from over voltage fault

To control the supply voltage to the contactor

To maintain constant terminal voltage

Question 21 of 37

Question 22 of 37

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

Grommets

DIN Rail

PVC channel

G. channel

Question 22 of 37

Question 23 of 37

23. Why are control panels provided with control transformer?

To maintain rated voltage to load

To maintain rated main supply voltage

To operate the auxiliary circuits

To supply reduced voltage to power circuit

Question 23 of 37

Question 24 of 37

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

Mounting MCB

Pathway for electrical wiring and protection

Mounting relays

Mounting double deck terminal contactor

Question 24 of 37

Question 25 of 37

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

Protect the motor from over heating and loading

Switching ON/OFF the circuit

Protect the circuit from earth fault

Control the circuit based on time delay

Question 25 of 37

Question 26 of 37

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

Stop button

Start button

Main contact

Auxiliary contact

Question 26 of 37

Question 27 of 37

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

Cotton ties

Nylon ties

Silk ties

P.V.C ties

Question 27 of 37

Question 28 of 37

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

Miniature circuit breaker

Time delay relay

Thermal overload relay

Isolating switch

Question 28 of 37

Question 29 of 37

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

AC₂

AC₁

AC ₃

AC₄

Question 29 of 37

Question 30 of 37

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

Controls machine from over heat

Controls distance movement of any machine

Controls machine from over speed

Controls machine from over loading

Question 30 of 37

Question 31 of 37

31. Which switch is operated at OFF load condition?

Limit switch

Two way switch

Push button switch

Isolating switch

Question 31 of 37

Question 32 of 37

32. What is the criteria to select the contactor?

Type of supply

Place of use the contactor

Type of load connected

Supply voltage and load

Question 32 of 37

Question 33 of 37

33. Which circuit uses limit switches?

Lift circuits

Street lighting

Domestic power circuits

Motor control circuits

Question 33 of 37

Question 34 of 37

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

Terminal connector

Lugs

Grommet

Thimble

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 no volt coil rating

As per supply voltage

As per the type of supply

Question 35 of 37

Question 36 of 37

36. 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 delta only

Runs in star only

Question 36 of 37

Question 37 of 37

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

By using Grommets

By using cable binding straps

By using sleeve

By providing nylon cable ties

Question 37 of 37