Write applications of each of the following:(i) Fuse (ii) MCB (iii) MCCB.

Write applications of each of the following:(i) Fuse (ii) MCB (iii) MCCB.
by

1 Answer

Answer :

i) Applications of fuse:

 * Used in domestic installations to provide short circuit protection.

 * Used in commercial / Industrial installations to provide overload and short circuit protection.

 * Used in educational institutes for practical.

 * Used for protection of various appliances.

 * Used for protection of various electronic circuits.

ii) Applications of MCB:

 * Used in lightning circuits.

 * Used in distribution feeders.

 * Used in switching motors.

 * Used in capacitors.

 * Used in power circuits.

 * Used in control transformers.

iii) Applications of MCCB:

 Used in

 * Distribution feeders,

 * Distribution transformers,

 * Diesel generating sets

 * L.T capacitors

 * Rectifiers panels,

 * U.P.S, Electronic equipment,

 * Motors,

 * Furnaces
by

Related questions

Explain the lighting scheme to be designed for each of the following: i) Special ward in hospitals ii) Dentist’s Cabin

Description : Explain the lighting scheme to be designed for each of the following: i) Special ward in hospitals ii) Dentist’s Cabin 

Last Answer : i) Special ward in hospital: For the patients in the wards, lighting should create a cozy and pleasant atmosphere. Lighting in the wards should be planned in such a way that it meets the specific ... we use such as cements and bonding agents that we use to restore your teeth back to health.

State the applications and specification of (i) Resistor (ii) Capacitor (iii)Inductor

Description : State the applications and specification of (i) Resistor (ii) Capacitor (iii)Inductor

Last Answer : Application of resistor: 1.Resistors are used in high frequency instrument. 2.Resistor is used in power control circuit. 3.It is used in DC power supplies. 4.Resistors are used ... DC Current  3.Electromagnetic Interference (EMI)  4.Magnetic Saturation Flux Density  5.Curie Temperature 

State any two advantages of MCB over Fuse. State the standard specifications of MCB available in the market.

Description : State any two advantages of MCB over Fuse. State the standard specifications of MCB available in the market.  

Last Answer : Following advantages of MCB over Fuse: 1. No need of replacement of fuse wire. 2. Manually restore of supply is simple. 3. Fault understanding by visual inspection 4. More safe than fuse The standard specifications of ... 6A, 10A,16A,20A, 25A, 30A, 32A, 40A, 50A, 60A and 63A 6. 250V and 450 v

State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders

Description : State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders

Last Answer : Application Suitable Single Phase Motor Table Fan 1) Capacitor split phase motor 2) Capacitor start capacitor run motor Mixers and Grinders 1) Universal motor 2) A.C. Series motor

State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material.

Description : State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material. 

Last Answer :  (i) Application of PVC paper : 1. It is used in slot lining or motor winding insulation purpose 2. For Insulation of Transformer winding (ii) Application of Porcelain : 1. Mainly used for manufacturing ... on withstand temperature : * H' & C' Class of insulation i e. 180° and above 180°C 

Give the working of MCCB.

Description : Give the working of MCCB.

Last Answer : Working of MCCB: ( Molded Case Circuit Breaker)  * The operating mechanism consisting of lever, spring, contacts etc. is used to open or close the MCCB electrically.  * The arc ... produced by short-circuit current operates the lever to trip the MCCB immediately and open the contacts. 

Obtain the sinusoids corresponding to each of the following phasors

Description : Obtain the sinusoids corresponding to each of the following phasors

Last Answer : Obtain the sinusoids corresponding to each of the following phasors

Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span

Description :  Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span 

Last Answer : Parameter LED CFL Lamp Efficiency  High (more than 70 lumen per watt) Comparatively less (50-60 lumen per watt) Life span (in working hours) 10000 3000

Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage

Description : Define: i) Input Offset Voltage ii) Input offset Current iii) Input Bias Current iv) Output offset voltage

Last Answer : Definition of parameters of OPAMP is follows:  i) Input Offset Voltage: Input offset voltage is defined as the voltage that must be applied between the two input terminals of an OPAMP to null or ... to ground) and output voltage is obtained non zero such voltage is output offset voltage of opamp.

State the function of : i) MCCB ii) ELCB iii) MCB iv) Switch.

Description : State the function of : i) MCCB ii) ELCB iii) MCB iv) Switch. 

Last Answer : i) MCB: Provide short circuit protection & over load protection to electrical loads.  ii) ELCB: Provides protection by detecting the unsafe magnitudes leakage currents flowing to earth and disconnecting ... rating.  iv) Switch: Make and break the electrical connection to the load manually.

Give the function of fuse and switch.

Description : Give the function of fuse and switch.

Last Answer : Functions of fuse:  * To break the circuit under fault condition.  * To provide overcurrent protection to the circuit.  * To provide short circuit protection to the circuit.  * To provide ...  * To make the electric circuit manually.  * To break the electric circuit manually.

Write two applications of D.C. series motor.

Description : Write two applications of D.C. series motor. 

Last Answer : The applications of D.C. series motor: 1. Cranes 2. Hoists 3. Trolley and cars 4. Conveyors 5. For traction work i.e. electric locomotives 6. Elevator 7. Air compressor

State the types of protections provided by MCB.

Description : State the types of protections provided by MCB. 

Last Answer : The types of protections provided by MCB: 1. MCB provides short circuit protection. 2. MCB provides overload protection

Draw the block diagram of regulated power supply, explain function of each block and draw waveforms of each stage.

Description : Draw the block diagram of regulated power supply, explain function of each block and draw waveforms of each stage.

Last Answer : 1. A step down transformer 2. A rectifier 3. A filter 4. A regulator Operation of Regulated Power Supply:- Step Down Transformer:- A step down transformer will ... regulator. A regulator will maintain the output constant even when changes at the input or any other changes occur.

State the applications of TIG welding.

Description : State the applications of TIG welding.

Last Answer : The applications of TIG welding are as follows: 1. Mostly used to weld aluminum and aluminum alloys. 2. It is used to weld stainless steel, carbon base alloy, copper base alloy, nickel base alloy etc. 3. It is used to welding dissimilar metals. 4. It is mostly used in aerospace industries.

State the applications of rolling.

Description : State the applications of rolling.

Last Answer : Applications of rolling are as follows: 1. Concrete reinforcing bars. 2. Plates. 3. Wire rods. 4. Sheet and strip. 5. Rails. 6. Piping and tubes. 7. Body panels. 8. Construction materials

State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Description : State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Last Answer : Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows:  1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine 

State functions of the following pins of IC555.

Description : State functions of the following pins of IC555.

Last Answer : 1) Control: - The dc Voltage at this pin is 2/3 Vcc. An external voltage applied to this changes threshold as well as trigger voltage to obtain pulse width modulated output.  2) Trigger: - The ... greater than 2/3 Vcc . When the voltage goes below 1/3 Vcc, output of the timer goes high.

Explain the meaning of following terms: i) MCB ii) Socket outlet iii) Neutral iv) Fuse-link

Description : Explain the meaning of following terms: i) MCB ii) Socket outlet iii) Neutral iv) Fuse-link

Last Answer : i) MCB:  Miniature circuit breaker operates automatically at the time of fault or over load. And it is used for the protection of electrical installation. They are available from 0.5 A to 100 Amps. ... melts automatically at the time of fault or over load. Fuse must be replaced after the fault.

Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Last Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

State the material used for making (1) Magnetic Core (2) Fuse element

Description : State the material used for making (1) Magnetic Core (2) Fuse element  

Last Answer : The material used for making of:  (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel  (2) Fuse Element: Tin- lead wire, Tinned copper wire 

Draw block diagram of PLL as a FM demodulator. Explain function of each block.

Description : Draw block diagram of PLL as a FM demodulator. Explain function of each block.

Last Answer : Operation:  The FM signal which is to be demodulated is applied at the input of the PLL.  the PLL is locked to the FM  The error voltage produced at ... using PLL ensures a high Linearity, between the instantaneous input frequency and VCO control voltage (error amplifier output)

What is earthing? Give the importance of earthing.

Description : What is earthing? Give the importance of earthing.

Last Answer : Meaning of earthing: Connecting the metallic frame of the electrical machines /any electrical equipment body etc. to ground by using wire/conductor is known as earthing.  Importance of Earthing:  ... currents. 5. To provide stable platform for operation of sensitive electronic equipment's. 

With a neat sketch give the working of shaded pole induction motor.

Description : With a neat sketch give the working of shaded pole induction motor.

Last Answer : Explanation: It has squirrel cage rotor and salient pole stator. The stator poles are shaded partially by short circuited conductor band to create the phase difference between the fluxes emerging from shaded ... rotating magnetic field in the air-gap and torque is exerted on the squirrel cage rotor.

List the main parts of D.C. motor

Description : List the main parts of D.C. motor

Last Answer : Main parts of D.C. motor and their functions:  Part Functions Yoke i) Provides mechanical support for poles. ii) Acts as protecting cover for machine. iii) Carries magnetic flux. ... a fixed physical position relative to the stator.  Shaft Used to transfer mechanical power 

Explain the concept of lagging and leading phase angle by waveform.

Description : Explain the concept of lagging and leading phase angle by waveform.

Last Answer : i) Leading phase angle :  When two ac quantities of same frequency do not attain their respective zero or peak values simultaneously, then the quantities are said to be out-of-phase quantities. The ... Similarly, in the second diagram, the voltage is said to be lagging the current by  Φ.

What is MCCB?

Description : What is MCCB?

Last Answer : MCCB stand for moulded case circuit breaker. It is used for high current protection. MCCB have higher rating than MCB. Suppose MCB have rating up to 10 kA then MCCB will have rating of 100 kA.

Using phasors, determine in the following equations

Description : Using phasors, determine in the following equations

Last Answer : Using phasors, determine in the following equations

Apply phasor analysis to evaluate the following

Description : Apply phasor analysis to evaluate the following

Last Answer : Apply phasor analysis to evaluate the following

Simplify the following:

Description : Simplify the following: 

Last Answer : Simplify the following: 

Transform the following sinusoids to phasors

Description : Transform the following sinusoids to phasors

Last Answer : Transform the following sinusoids to phasors

Evaluate the following complex numbers

Description : Evaluate the following complex numbers

Last Answer : Evaluate the following complex numbers

Evaluate the following quantities and express your results in polar form

Description : Evaluate the following quantities and express your results in polar form

Last Answer : Evaluate the following quantities and express your results in polar form

Find the phasors corresponding to the following signals

Description : Find the phasors corresponding to the following signals

Last Answer : Find the phasors corresponding to the following signals

Evaluate the following complex numbers and leave your results in polar form

Description : Evaluate the following complex numbers and leave your results in polar form

Last Answer : Evaluate the following complex numbers and leave your results in polar form

Express the following functions in cosine form

Description : Express the following functions in cosine form

Last Answer : Express the following functions in cosine form

State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them.

Description : State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

Last Answer : The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc  ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.

Write the ladder program for 24 hour clock.

Description : Write the ladder program for 24 hour clock.

Last Answer : Ladder Program for 24 hour clock:

Types of rolling mills and its applications

Description : Types of rolling mills and its applications

Last Answer : Types of rolling mills and its applications (1) Two-high rolling mill: used in blooming and slabbing mills (2) Three-high rolling mill: used for making plates or sections. (3) Four- ... : This mill is used for rolling stainless steel and other high strength steel sheets of thin gauge.

List applications of stepper motor.

Description : List applications of stepper motor.

Last Answer : Applications of Stepper Motor: 1) Computer controlled systems 2) Numerical control of machine tools 3) Tape drives 4) Floppy disc drives 5) Computer printers 6) X-Y plotters 7) ... ) Extruders 21) Engravers 22) Analytical and Medical instruments 23) Embroidery Machines 24) Packaging Machines

List applications of servomotor.

Description : List applications of servomotor.

Last Answer : Applications of Servomotor: 1) Computers 2) Robotics and toys 3) CD/DVD players 4) Textile industries 5) Instrument servos 6) Tracking and guidance system 7) Self-balancing recorders 8 ... 9) Process controllers 10) Electromechanical actuators 11) Air-craft control system 12) Programming device

Explain MCB and ELCB with connection diagram supplying single phase load.

Description : Explain MCB and ELCB with connection diagram supplying single phase load. 

Last Answer : OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel. 

What is MCB?

Description : What is MCB?

Last Answer : MCB is a miniature circuit breaker. MCB is used for overcurrent protection. MCB have low rating as compared to MCCB. MCB have thermal trip unit and magnetic trip unit. MCB can also be ... faster as compared to thermal trip unit it disconnect very quickly and used for short circuit protection.

State the procedure for testing of earth pit resistance with necessary diagrams.

Description : State the procedure for testing of earth pit resistance with necessary diagrams.

Last Answer : Following procedure (Method) for testing of earth pit resistance with necessary diagrams. 1) Earth Tester : i) Three point method ii) Four point method 2) By Potential drop method 3 ... of that earthing pit. In this test the accuracy is less but electrical rods are not required. 

State the procedure for laying / installation of underground cable.

Description : State the procedure for laying / installation of underground cable.  

Last Answer : 1) Direct laying Cable: or Trench laying method: Procedure: * For laying of a cable trench about 1.5m deep and 0.5m wide is made along the cable route. * A ... over. * Cables laid in this manner are usually plain lead covered because troughing affords good mechanical protection. 

Explain the suitability of aluminium as an electrical conductor with respect to its mechanical and electrical properties.

Description : Explain the suitability of aluminium as an electrical conductor with respect to its mechanical and electrical properties. 

Last Answer : Following are requirements of conductor:- i) High conductivity :  Material should have high conductivity, So that * cross section of conductor (size) reduces, * Copper losses reduces, * So Efficiency ... . Boiling point is 1820°C 9. Specific gravity is 2.7 10. High resistance to corrosion. 

State the type of insulating materials under Class Y and Class B.

Description : State the type of insulating materials under Class Y and Class B.

Last Answer : The type of insulating materials under Class Y : 1. Cotton  2. Silk 3. Paper 4. Rubber 5. PVC The type of insulating materials under Class B: 1. Backelite 2. Impregnated varnish 3. Mica 4. Fiber glass 5. Asbestos 

Explain with neat sketch the working principle of MIG.

Description : Explain with neat sketch the working principle of MIG.

Last Answer : In metal-arc inert gas welding the Weld area is shielded by an effectively inert atmosphere of argon, helium, carbon dioxide, or various other gas mixtures . The consumable bare Wire is fed automatically ... of the molten-weld puddle. Multiple-weld layers can be deposited at the joint. 

Define armature reaction in an alternator. Explain the effect of armature reaction at various P.F. of loads of alternator.

Description : Define armature reaction in an alternator. Explain the effect of armature reaction at various P.F. of loads of alternator.

Last Answer : Armature Reaction: The effect of armature flux on main flux is called as armature reaction.  Armature Reaction at Various Power Factors: When armature is loaded, the armature flux modifies ... lagging p.f. For capacitive loads the effect of flux is partly distorting and partly strengthening.

Explain the activities carried out during weekly maintenance of 3 ph. Induction motor.

Description : Explain the activities carried out during weekly maintenance of 3 ph. Induction motor. 

Last Answer : Activities Carried out During Weekly Maintenance of 3 ph. Induction Motor:  1) Check belt tension. In cases where this is excessive it should immediately be reduces and in the case of sleeve ... and cooled by oil mist systems its important to check the oil mist flow paths/pressure components.