Question 1 of 37

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

Terminal connector

Thimble

Lugs

Grommet

Question 1 of 37

Question 2 of 37

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

By using cable binding straps

By providing nylon cable ties

By using sleeve

By using Grommets

Question 2 of 37

Question 3 of 37

3. Which switch is operated at OFF load condition?

Limit switch

Push button switch

Isolating switch

Two way switch

Question 3 of 37

Question 4 of 37

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

Supply AC system 3 phase

Single phase AC system

Apparatus AC system 3 phase

Supply DC 3 wire system

Question 4 of 37

Question 5 of 37

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

To increase the current carrying capacity

To increase the insulation resistance

To reduce heat

To reduce the radio interference

Question 5 of 37

Question 6 of 37

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

Stop button

Main contact

Auxiliary contact

Start button

Question 6 of 37

Question 7 of 37

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

No voltage exist in reverse contactor

Due to interlock in reverse contactor

Fault in forward contactor

No volt coil is not energized

Question 7 of 37

Question 8 of 37

8. Why are control panels provided with control transformer?

To maintain rated main supply voltage

To supply reduced voltage to power circuit

To maintain rated voltage to load

To operate the auxiliary circuits

Question 8 of 37

Question 9 of 37

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

As per the type of supply

As per rated current

As per no volt coil rating

As per supply voltage

Question 9 of 37

Question 10 of 37

10. 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 10 of 37

Question 11 of 37

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

AC ₃

AC₁

AC₄

AC₂

Question 11 of 37

Question 12 of 37

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

Cotton ties

P.V.C ties

Silk ties

Nylon ties

Question 12 of 37

Question 13 of 37

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

Mounting relays

Pathway for electrical wiring and protection

Mounting double deck terminal contactor

Mounting MCB

Question 13 of 37

Question 14 of 37

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

Control the circuit based on time delay

Protect the circuit from earth fault

Protect the motor from over heating and loading

Switching ON/OFF the circuit

Question 14 of 37

Question 15 of 37

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

By using bimetallic strip to change the position

By manual operation

By operating electromagnet to change the position

By mechanical settings

Question 15 of 37

Question 16 of 37

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

Thermal overload relay

Isolating switch

Miniature circuit breaker

Time delay relay

Question 16 of 37

Question 17 of 37

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

For fixing terminal connectors

For fixing relays

For fixing instruments

For fixing contactors

Question 17 of 37

Question 18 of 37

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

Reduce the voltage drop 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

Question 18 of 37

Question 19 of 37

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

Suitable method of labelling and cable harnessing

Proper type of protection and measuring system

Outside dimensions and swing area of cabinet door

Inside area and number of indicating lights in front panel

Question 19 of 37

Question 20 of 37

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

DIN rails

Race ways

G channel

Grommets

Question 20 of 37

Question 21 of 37

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

G. channel

Grommets

PVC channel

DIN Rail

Question 21 of 37

Question 22 of 37

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

To minimize the operating cost

To increase the accuracy of operation

To share more loads

To reduce power consumption

Question 22 of 37

Question 23 of 37

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

Cable binding straps and button

Sleeves

Wire ferrules

Lugs and thimbles

Question 23 of 37

Question 24 of 37

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

Isolating switch

Limit switch

Push button switch

Toggle switch

Question 24 of 37

Question 25 of 37

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

Controls machine from over loading

Controls machine from over heat

Controls distance movement of any machine

Controls machine from over speed

Question 25 of 37

Question 26 of 37

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

Timer

Control transformer

Relays

Contactor

Question 26 of 37

Question 27 of 37

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

Indicating lamp

Sensors

Push button switch

Isolating switch

Question 27 of 37

Question 28 of 37

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

Electro mechanical relay

Thermal relay

Rectifier

Limit switch

Question 28 of 37

Question 29 of 37

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

Starting and stopping with inching and braking

Starting and stopping of shunt motor

Starting and stopping of series motor

Resistive loads except motor loads

Question 29 of 37

Question 30 of 37

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

Over load relay trip

No volt coil

Stop button

Contactor

Question 30 of 37

Question 31 of 37

31. 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 31 of 37

Question 32 of 37

32. Which circuit uses limit switches?

Lift circuits

Domestic power circuits

Street lighting

Motor control circuits

Question 32 of 37

Question 33 of 37

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

Copper

Bronze

Brass

Silver

Question 33 of 37

Question 34 of 37

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

Wire sleeves

Wire ferrules

Nylon cable ties

Cable binding strap

Question 34 of 37

Question 35 of 37

35. 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 maintain constant terminal voltage

To control the supply voltage to the contactor

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 in delta only

Runs in star only

Runs normally

Starts and stop

Question 36 of 37

Question 37 of 37

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

Star→Main→Timer→Delta

Main→Star→Delta→Timer

Star→Timer→Main→Delta

Main→Timer→Delta→Star

Question 37 of 37