Welcome to Online Test Semester 4,Module 2-Control Panel Wiring

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(Electrician & Wireman 2nd Year)

NAME *

MOBILE NUMBER *

NAME OF THE ITI *

1. Which supply indicates by the colour of conductor exihibited on Red, Blue and Black? *

2 分

A Supply DC 3 wire system|

B Single phase AC system

C Supply AC system 3 phase

D Apparatus AC system 3 phase

2.Which cable ties are used to bunch the wires? *

2 分

A Silk ties

B P.V.C ties

C Nylon ties

D Cotton ties

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

2 分

A Sensors

B Indicating lamp

C Isolating switch

D Push button switc

4. What is the name of the device marked X’? *

2 分

A Stop button

B Start button

C Main contact

D Auxiliary contact

5. What is the name of the wiring accessory used in control panel wiring *

2 分

A DIN rails

B G channel

C Grommets

D Race ways

6. What is the name of the device marked as X’in the circuit? *

3 分

A Contactor

B No volt coil

C Stop button

D Over load relay trip

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

2 分

A Wire ferrules

B Wire sleeves

C Nylon cable ties

D Cable binding strap

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

2 分

A Lugs

B Thimble

C Grommet

D Terminal connector

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

2 分

A Isolating switch

B Time delay relay

C Thermal overload relay

D Miniature circuit breaker

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

3 分

A Limit switch

B Toggle switch

C Isolating switch

D Push button switch

11. Which switch is operated at OFF load condition? *

2 分

A Limit switch

B Isolating switch

C Two way switch

D Push button switch

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

2 分

A Panel board is made in metal box

B Control the stray field in the panel

C Reduce the voltage drop in panel board

D Ensure one earthing in case of other failure

13. Which circuit, the limit switches are used? *

2 分

A Lift circuits

B Street lighting

C Motor control circuits

D Domestic power circuits

14. How the control circuit voltage and power in a contactor are to be selected? *

2 分

A As per rated current

B As per supply voltage

C As per no volt coil rating

D As per the type of supply

15. What is the criteria to select the contactor? *

2 分

A Type of supply

B Type of load connected

C Supply voltage and load

D Place of use the contacto

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

2 分

A DIN Rail

B G. channel

C Grommets

D PVC channel

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

2 分

A Rectifier

B Limit switch

C Thermal relay

D Electro mechanical relay

18. What is the use of G’ channels in control panel? *

2 分

A For fixing relays

B For fixing contactors

C For fixing instruments

D For fixing terminal connectors

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

2 分

A Controls machine from over heat

B Controls machine from over speed

C Controls machine from over loading

D Controls distance movement of any machine

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

2 分

A AC1

B AC2

C AC3

D AC4

21. Which is the correct sequence operation of contactors for operating automatic star delta *

3 分

A Main→Star→Delta→Timer

B Star→ Main→Timer→Delta

C Main→Timer→Delta→Star

D Star→Timer→Main→Delta

22. Why control panels are provided with control transformer? *

2 分

A To maintain rated voltage to load

B To operate the auxiliary circuits

C To maintain rated main supply voltage

D To supply reduced voltage to power circuit

23. What happens, if time delay relay of a auto star delta starter still in closed condition after starting? *

2 分

A Starts and stop

B Runs normally

C Runs in star only

D Runs in delta only

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

2 分

A Mounting MCB

B Mounting relays

C Path way for electrical wiring and protection

D Mounting double deck terminal contactor

25. What is the purpose of thermal over load relay in control panel? *

2 分

A Switching ON/OFF the circuit

B Protect the circuit from earth fault

C Control the circuit based on time delay

D Protect the motor from over heating and loading

26. Why sequential control of motors is required in an industrial application? *

2 分

A To share more loads

B To reduce power consumption

C To minimise the operating cost

D To increase the accuracy of operation

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

2 分

A Silver

B Brass

C Copper

D Bronze

28.. Which device controls the operations in sequential control systems? *

2 分

A Timer

B Relays

C Contactor

D Control transformer

29. Which DC load is represented by the DC 4 standard duty cycle of contactors? *

2 分

A Resistive loads except motor loads

B Starting and stopping of shunt motor

C Starting and stopping of series motor

D Starting and stopping with inching and braking

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

2 分

A To maintain constant terminal voltage

B To supply the power to the auxiliary circuits

C To control the supply voltage to the contactor

D To protect the control elements from over voltage fault

31. How the contacts in a contactor can be engaged for working? *

2 分

A By manual operation

B By mechanical settings

C By operating electromagnet to change the position

D By using bimetallic strip to change the position

32. Which device prevents flare out of stripped and stranded cables in the panel board *

2 分

A Sleeves

B Wire ferrules

C Lugs and thimbles

D Cable binding straps and button

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

2 分

A By using sleeve

B By using Grommets

C By using cable binding straps

D By providing nylon cable ties

34 What essential feature to be considered while designing a layout of control panel? *

2 分

A Proper type of protection and measuring system

B Inside area and number of indicating lights in front panel

C Suitable method of labelling and cable harnessing

D Outside dimensions and swing area of cabinet door

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

2 分

A To reduce heat

B To reduce the radio interference

C To increase the insulation resistance

D To increase the current carrying capacity

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

2 分

A No volt coil is not energized

B Fault in forward contactor

C Due to interlock in reverse contactor

D No voltage exist in reverse contactor

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