# Basics Of Electricity ---- Being Power Distribution Products Like Mcbs/Mccbs By Legrand…

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Questions: 21 | Attempts: 64

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• 1.

### 1. What Is a meaning  of  AC  and DC in electricity ??

• A.

Accerating Current

• B.

Alternating Current

• C.

Dilelectric Current

• D.

Direct Current

B. Alternating Current
D. Direct Current
Explanation
AC stands for Alternating Current, which is a type of electrical current that periodically changes direction. It is commonly used in household electricity and is delivered through power lines. DC stands for Direct Current, which is a type of electrical current that flows in only one direction. It is commonly used in batteries and electronic devices.

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• 2.

### 2. Do we have AC or DC  at our home or Residential use?

• A.

AC

• B.

Both AC & DC

• C.

DC

• D.

None Of The Above

A. AC
Explanation
AC stands for alternating current, which is the type of electrical current commonly used in homes for residential purposes. AC current periodically changes direction, allowing for the efficient transmission of electricity over long distances. It is generated by power plants and delivered to homes through the electrical grid. In contrast, DC (direct current) flows in one direction only and is typically used for specific applications such as batteries and electronic devices. Therefore, the correct answer is AC, indicating that homes have AC current for residential use.

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• 3.

### 3. What is  Single Phase and Three Phase voltage levels in India??

• A.

200/400 Volts

• B.

180/390 Volts

• C.

215/425 Volts

• D.

250/480 Volts

C. 215/425 Volts
Explanation
In India, the single-phase voltage level is 215 volts and the three-phase voltage level is 425 volts. This means that for single-phase electrical systems, the voltage supplied is 215 volts, while for three-phase electrical systems, the voltage supplied is 425 volts.

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• 4.

### 4. Do Legrand has MCBs/ MCCBs suitable for AC and DC both application?

• A.

True / Yes

• B.

False / No

A. True / Yes
Explanation
Yes, Legrand does have MCBs/MCCBs suitable for both AC and DC applications. This means that their circuit breakers can be used for electrical systems that use alternating current (AC) as well as systems that use direct current (DC). This versatility allows Legrand's circuit breakers to be used in a wide range of applications, making them a suitable choice for various electrical installations.

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• 5.

### 5. Do we select MCB as per Voltage rating or current rating??

• A.

Only Voltage

• B.

Only Current

• C.

Both

• D.

None Of The Above

B. Only Current
Explanation
MCB (Miniature Circuit Breaker) is selected based on its current rating, not the voltage rating. The current rating of an MCB determines the maximum amount of current it can safely handle without tripping. It is important to select an MCB with the appropriate current rating to ensure proper protection of the electrical circuit. The voltage rating of an MCB indicates the maximum voltage it can withstand, but it does not affect the selection process as long as it is higher than the voltage of the circuit being protected. Therefore, the correct answer is "Only Current."

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• 6.

### 6. Can we suggest DX3 AC MCB of Legrand  for DC application ? If yes/no then what will be its Voltage capacity for DC application?

• A.

Yes

• B.

No

• C.

30V Dc

• D.

40V Dc

• E.

60V Dc

• F.

80V Dc

A. Yes
F. 80V Dc
Explanation
Yes, we can suggest the DX3 AC MCB of Legrand for DC application. Its voltage capacity for DC application is 80V DC.

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• 7.

### 7. Which type of protection MCB/MCCB offers in power line??

• A.

High Voltage Tripping

• B.

Low Voltage Tripping

• C.

Low Current Tripping

• D.

High Current Tripping

D. High Current Tripping
Explanation
MCB/MCCB offers high current tripping as a type of protection in power lines. This means that when the current flowing through the power line exceeds a certain threshold, the MCB/MCCB will automatically trip and disconnect the circuit, preventing any damage or overheating that could occur due to the high current. This protection mechanism helps to ensure the safety and reliability of the power line.

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• 8.

### 8. What is operating principle of MCB/MCCBs??

• A.

Only Thermal

• B.

Only Electronic

• C.

Thermal/Electronic

• D.

Thermal in MCB & Both in MCCB

D. Thermal in MCB & Both in MCCB
Explanation
The operating principle of MCB (Miniature Circuit Breaker) is only thermal, meaning it operates based on the heat generated by excessive current flow. On the other hand, MCCB (Molded Case Circuit Breaker) operates on both thermal and electronic principles. It uses thermal protection for overload conditions and electronic protection for short circuit conditions. Therefore, the correct answer is "Thermal in MCB & Both in MCCB."

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• 9.

### 9. According to operating principle which are two main type  of MCCBs in Legrand Range?

• A.

Thermal MCCBs Only

• B.

Electronic MCCBs Only

• C.

Thermal/Electronic Both

• D.

Thermal upto 1250A & Electronic upto 1600A

D. Thermal upto 1250A & Electronic upto 1600A
Explanation
The correct answer is "Thermal upto 1250A & Electronic upto 1600A." This means that there are two main types of MCCBs in the Legrand Range: thermal MCCBs that can handle currents up to 1250A and electronic MCCBs that can handle currents up to 1600A.

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• 10.

### 10. What is a accesory or part name used to get signal about position of  MCB and MCCB ?

• A.

Undervoltage Coil

• B.

Auxillary Contact

• C.

Shunt Coil

• D.

Aux/Fault Signaling Contact

B. Auxillary Contact
Explanation
An auxiliary contact is a part or accessory used to get a signal about the position of MCB (Miniature Circuit Breaker) and MCCB (Molded Case Circuit Breaker). It is a secondary set of contacts that operates in conjunction with the main contacts of the circuit breaker. The auxiliary contact provides a signal or feedback to indicate whether the circuit breaker is in the open or closed position. This information is useful for monitoring and controlling the circuit breaker remotely or for integration into a larger electrical system.

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• 11.

### 11. How many frame sizes of DPX3 MCCBs do Legrand have ??

• A.

3 Size

• B.

7 Size

• C.

4 Size

• D.

5 Size

C. 4 Size
Explanation
Legrand has 4 different frame sizes of DPX3 MCCBs.

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• 12.

### 12. What are different current ratings available in Legrand DPX3 MCCBs??    a) What is minimum Current rating ? ________ b) What Is Maximum Current rating?? ________

16Amp, 16A, 16
1600Amp, 1600A, 1600
Explanation
The different current ratings available in Legrand DPX3 MCCBs are 16 Amp, 16A, 16 and 1600 Amp, 1600A, 1600.

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• 13.

### 13. What do we mean by SP/SPN ?

• A.

Separate pole /Separate Neutral

• B.

Single Pole/ Single Pole without Neutral

• C.

Single Pole /Single pole with advanced Neutral

• D.

Side Pole/ Side pole with advanced Neutral

• E.

None of the above

C. Single Pole /Single pole with advanced Neutral
Explanation
SP/SPN stands for Single Pole / Single pole with advanced Neutral. This means that the electrical system has a single pole and an advanced neutral connection.

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• 14.

### 14. What are 3-5 USPs of LEGRAND MCBs ? A)________ B)________ C)________ D)________ E)________

label holder, 35sq mm contact, air channel, sliding shutter, copy tracer
label holder, 35sq mm contact, air channel, sliding shutter, copy tracer
label holder, 35sq mm contact, air channel, sliding shutter, copy tracer
label holder, 35sq mm contact, air channel, sliding shutter, copy tracer
label holder, 35sq mm contact, air channel, sliding shutter, copy tracer
Explanation
The correct answer is label holder, 35sq mm contact, air channel, sliding shutter, copy tracer. These are the unique selling points (USPs) of LEGRAND MCBs. These features differentiate LEGRAND MCBs from other circuit breakers and make them stand out in the market. The label holder allows for easy identification and organization of circuits. The 35sq mm contact ensures a secure and efficient electrical connection. The air channel provides effective cooling and heat dissipation. The sliding shutter adds an extra layer of safety by preventing accidental contact. The copy tracer feature allows for easy replication of circuit configurations.

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• 15.

### 15. Do legrand have Motorised MCB/MCCB??

• A.

True / Yes

• B.

False / No

A. True / Yes
Explanation
The correct answer is true/yes because Legrand does have motorized MCB/MCCB.

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• 16.

### 16. DO Legrand has Drawout MCCB??  Which are applications of use of D/O MCCBs ??

• A.

True / Yes

• B.

False / No

A. True / Yes
Explanation
The given answer states that DO Legrand has Drawout MCCB and it is true/yes. This implies that Legrand does offer Drawout MCCBs. However, the question also asks about the applications of use of D/O MCCBs, but this information is not provided in the given answer.

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• 17.

### 17. What is use of Auxiliaries in MCB/MCCB? 4 uses minimum A)________ B)________ C)________ D)________

On/Off indication, Electrical Interlock, Remote tripping, Undervoltage Protection
On/Off indication, Electrical Interlock, Remote tripping, Undervoltage Protection
On/Off indication, Electrical Interlock, Remote tripping, Undervoltage Protection
On/Off indication, Electrical Interlock, Remote tripping, Undervoltage Protection
Explanation
Auxiliaries in MCB/MCCB are used for on/off indication, electrical interlock, remote tripping, and undervoltage protection. These features provide additional functionality and safety measures to the circuit breaker. On/off indication allows users to easily determine the status of the breaker. Electrical interlock ensures that multiple breakers cannot be turned on simultaneously, preventing potential damage. Remote tripping allows the breaker to be controlled from a remote location, enhancing convenience and safety. Undervoltage protection helps protect against voltage drops, preventing damage to the connected equipment.

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• 18.

### 18. What do we mean for   ICU  and ICS  in MCB/MCCB?

• A.

Useful current ICU/ Short current ICS

• B.

Ultimate current/ Short Circuit current

• C.

Ultimate Breaking Capacity/ Service Breaking Capacity

• D.

Inrush Current useful limit( ICU)/ Inrush Current Service limit( ICS)

C. Ultimate Breaking Capacity/ Service Breaking Capacity
• 19.

### 19. How many times  Breaker is tested on fault current for ICU test?

• A.

1

• B.

3

• C.

4

• D.

2

D. 2
Explanation
The breaker is tested on fault current for ICU test two times.

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• 20.

### 20. How many Times Breaker is tested on fault current for  ICS  Test ?

• A.

1

• B.

3

• C.

4

• D.

2

B. 3
Explanation
Breaker is tested on fault current for ICS (Interrupting Capacity Standard) test three times. This test is conducted to determine the ability of the breaker to interrupt a fault current safely and effectively. By conducting the test three times, it ensures that the breaker is reliable and can handle multiple fault currents without any issues.

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• 21.

### 21. How many operating Handles do Legrand has for MCCB with IP degree ?

• A.

Only Direct Handle

• B.

Direct & Very Depth Handel

• C.

Only Very Depth

• D.

No Handels availabe for offer for IP Protection use

B. Direct & Very Depth Handel
Explanation
Legrand has two operating handles for MCCB with IP degree: Direct Handle and Very Depth Handle.

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