ELECTRICIAN 2nd YEAR MODULE – Control Panel Wiring ONLINE TEST

Question 1 of 37

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

Limit switch

Electro mechanical relay

Thermal relay

Rectifier

Question 1 of 37

Question 2 of 37

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

Toggle switch

Limit switch

Push button switch

Isolating switch

Question 2 of 37

Question 3 of 37

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

Sensors

Indicating lamp

Isolating switch

Push button switch

Question 3 of 37

Question 4 of 37

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

Bronze

Copper

Silver

Brass

Question 4 of 37

Question 5 of 37

5. Which switch is operated at OFF load condition?

Isolating switch

Limit switch

Two way switch

Push button switch

Question 5 of 37

Question 6 of 37

6. Which circuit uses limit switches?

Motor control circuits

Domestic power circuits

Street lighting

Lift circuits

Question 6 of 37

Question 7 of 37

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

To minimize the operating cost

To share more loads

To reduce power consumption

To increase the accuracy of operation

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 voltage exist in reverse contactor

Fault in forward contactor

No volt coil is not energized

Question 8 of 37

Question 9 of 37

9. Why are control panels provided with control transformer?

To maintain rated voltage to load

To operate the auxiliary circuits

To supply reduced voltage to power circuit

To maintain rated main supply voltage

Question 9 of 37

Question 10 of 37

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

Lugs and thimbles

Cable binding straps and button

Sleeves

Wire ferrules

Question 10 of 37

Question 11 of 37

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

DIN Rail

Grommets

G. channel

PVC channel

Question 11 of 37

Question 12 of 37

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

Starts and stop

Runs in star only

Runs normally

Runs in delta only

Question 12 of 37

Question 13 of 37

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

For fixing instruments

For fixing relays

For fixing contactors

For fixing terminal connectors

Question 13 of 37

Question 14 of 37

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

Control the stray field in the panel

Reduce the voltage drop in panel board

Ensure one earthing in case of other failure

Panel board is made in metal box

Question 14 of 37

Question 15 of 37

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

Controls machine from over speed

Controls machine from over heat

Controls distance movement of any machine

Controls machine from over loading

Question 15 of 37

Question 16 of 37

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

Starting and stopping of shunt motor

Starting and stopping with inching and braking

Resistive loads except motor loads

Starting and stopping of series motor

Question 16 of 37

Question 17 of 37

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

Inside area and number of indicating lights in front panel

Proper type of protection and measuring system

Outside dimensions and swing area of cabinet door

Suitable method of labelling and cable harnessing

Question 17 of 37

Question 18 of 37

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

By using sleeve

By providing nylon cable ties

By using Grommets

By using cable binding straps

Question 18 of 37

Question 19 of 37

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

Grommets

G channel

Race ways

DIN rails

Question 19 of 37

Question 20 of 37

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

Thimble

Grommet

Lugs

Terminal connector

Question 20 of 37

Question 21 of 37

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

Auxiliary contact

Start button

Main contact

Stop button

Question 21 of 37

Question 22 of 37

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

Nylon cable ties

Cable binding strap

Wire ferrules

Wire sleeves

Question 22 of 37

Question 23 of 37

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

Silk ties

Cotton ties

Nylon ties

P.V.C ties

Question 23 of 37

Question 24 of 37

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

Control transformer

Relays

Contactor

Timer

Question 24 of 37

Question 25 of 37

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

To increase the current carrying capacity

To reduce heat

To reduce the radio interference

To increase the insulation resistance

Question 25 of 37

Question 26 of 37

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

Miniature circuit breaker

Time delay relay

Isolating switch

Thermal overload relay

Question 26 of 37

Question 27 of 37

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

Mounting relays

Pathway for electrical wiring and protection

Mounting MCB

Mounting double deck terminal contactor

Question 27 of 37

Question 28 of 37

28. What is the criteria to select the contactor?

Type of supply

Type of load connected

Supply voltage and load

Place of use the contactor

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?

AC₄

AC₁

AC ₃

AC₂

Question 29 of 37

Question 30 of 37

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

To control the supply voltage to the contactor

To maintain constant terminal voltage

To supply the power to the auxiliary circuits

To protect the control elements from over voltage fault

Question 30 of 37

Question 31 of 37

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

Stop button

Over load relay trip

No volt coil

Contactor

Question 31 of 37

Question 32 of 37

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

As per the type of supply

As per no volt coil rating

As per supply voltage

As per rated current

Question 32 of 37

Question 33 of 37

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

Protect the motor from over heating and loading

Switching ON/OFF the circuit

Control the circuit based on time delay

Protect the circuit from earth fault

Question 33 of 37

Question 34 of 37

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

Star→Timer→Main→Delta

Main→Star→Delta→Timer

Star→Main→Timer→Delta

Main→Timer→Delta→Star

Question 34 of 37

Question 35 of 37

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

By mechanical settings

By using bimetallic strip to change the position

By operating electromagnet to change the position

By manual operation

Question 35 of 37

Question 36 of 37

36. 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

Mounting the control accessories without screws

Install the high powered circuit accessories

Question 36 of 37

Question 37 of 37

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

Apparatus AC system 3 phase

Supply DC 3 wire system

Single phase AC system

Supply AC system 3 phase

Question 37 of 37