Question 1 of 37

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

Grommets

Race ways

G channel

DIN rails

Question 1 of 37

Question 2 of 37

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

AC₁

AC₂

AC ₃

AC₄

Question 2 of 37

Question 3 of 37

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

By providing nylon cable ties

By using sleeve

By using Grommets

By using cable binding straps

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. 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 5 of 37

Question 6 of 37

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

For fixing terminal connectors

For fixing relays

For fixing instruments

For fixing contactors

Question 6 of 37

Question 7 of 37

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

Silk ties

Nylon ties

Cotton ties

P.V.C ties

Question 7 of 37

Question 8 of 37

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

Supply AC system 3 phase

Supply DC 3 wire system

Apparatus AC system 3 phase

Single phase AC system

Question 8 of 37

Question 9 of 37

9. Which circuit uses limit switches?

Motor control circuits

Lift circuits

Street lighting

Domestic power circuits

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

To reduce the radio interference

To increase the insulation resistance

To reduce heat

To increase the current carrying capacity

Question 11 of 37

Question 12 of 37

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

Panel board is made in metal box

Reduce the voltage drop in panel board

Control the stray field in the panel

Ensure one earthing in case of other failure

Question 12 of 37

Question 13 of 37

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

Mounting double deck terminal contactor

Mounting MCB

Pathway for electrical wiring and protection

Mounting relays

Question 13 of 37

Question 14 of 37

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

DIN Rail

Grommets

G. channel

PVC channel

Question 14 of 37

Question 15 of 37

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

Resistive loads except motor loads

Starting and stopping of series motor

Starting and stopping with inching and braking

Starting and stopping of shunt motor

Question 15 of 37

Question 16 of 37

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

Proper type of protection and measuring system

Inside area and number of indicating lights in front panel

Suitable method of labelling and cable harnessing

Outside dimensions and swing area of cabinet door

Question 16 of 37

Question 17 of 37

17. Why are control panels provided with control transformer?

To maintain rated main supply voltage

To supply reduced voltage to power circuit

To operate the auxiliary circuits

To maintain rated voltage to load

Question 17 of 37

Question 18 of 37

18. Which switch is operated at OFF load condition?

Push button switch

Isolating switch

Limit switch

Two way switch

Question 18 of 37

Question 19 of 37

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

Main→Star→Delta→Timer

Star→Main→Timer→Delta

Main→Timer→Delta→Star

Star→Timer→Main→Delta

Question 19 of 37

Question 20 of 37

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

Cable binding straps and button

Sleeves

Lugs and thimbles

Wire ferrules

Question 20 of 37

Question 21 of 37

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

To increase the accuracy of operation

To reduce power consumption

To share more loads

To minimize the operating cost

Question 21 of 37

Question 22 of 37

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

Lugs

Terminal connector

Thimble

Grommet

Question 22 of 37

Question 23 of 37

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

Mounting the double deck terminal connectors

Install the high powered circuit accessories

Mounting the control accessories without screws

It provides a pathway for electrical wiring

Question 23 of 37

Question 24 of 37

24. 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 24 of 37

Question 25 of 37

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

Time delay relay

Thermal overload relay

Miniature circuit breaker

Isolating switch

Question 25 of 37

Question 26 of 37

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

Limit switch

Toggle switch

Push button switch

Isolating switch

Question 26 of 37

Question 27 of 37

27. What is the criteria to select the contactor?

Supply voltage and load

Type of load connected

Place of use the contactor

Type of supply

Question 27 of 37

Question 28 of 37

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

Main contact

Auxiliary contact

Stop button

Start button

Question 28 of 37

Question 29 of 37

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

Contactor

Stop button

Over load relay trip

No volt coil

Question 29 of 37

Question 30 of 37

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

Wire sleeves

Nylon cable ties

Cable binding strap

Wire ferrules

Question 30 of 37

Question 31 of 37

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

Control transformer

Relays

Timer

Contactor

Question 31 of 37

Question 32 of 37

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

Controls distance movement of any machine

Controls machine from over loading

Controls machine from over speed

Controls machine from over heat

Question 32 of 37

Question 33 of 37

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

Thermal relay

Rectifier

Limit switch

Electro mechanical relay

Question 33 of 37

Question 34 of 37

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

By mechanical settings

By using bimetallic strip to change the position

By manual operation

By operating electromagnet to change the position

Question 34 of 37

Question 35 of 37

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

Protect the circuit from earth fault

Protect the motor from over heating and loading

Switching ON/OFF the circuit

Control the circuit based on time delay

Question 35 of 37

Question 36 of 37

36. 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

Fault in forward contactor

Due to interlock in reverse contactor

No volt coil is not energized

Question 36 of 37

Question 37 of 37

37. 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

Runs normally

Starts and stop

Question 37 of 37