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Friday, 20 January 2017

Difference between Soldering and Brazing

Difference between Soldering and Brazing Points : difference between soldering and brazing, comprasion between soldering and brazing, soldering vs brazing
Difference between Soldering and Brazing
Soldering
Brazing
1.Low temperature is sufficient.High temperature is required.
2.Temperature requirement is up to 450°C in soldering joints.Temperature might go to 600°C in brazing joints.
3.Soldered parts are to be clean by water.Brazed parts are to be allowed to cool slowly.

Friday, 6 January 2017

Difference between Semiconductors and Insulators

Difference between Semiconductors and Insulators Points : difference between semiconductors and insulators, comparision between semiconductors and insulators, semiconductors vs insulators
Difference between Semiconductors and Insulators
Semiconductors
Insulators
1.In semiconductor effect of resistance is decrease and effect of temperature is amplify.In insulator effect of resistance is decreases and cause of temperature is increases.
2.They require energy less than insulators and more than good conductors to eliminate an electron from the parent atom.They require extremely large electric field to remove them from the attraction of nucleus.
3.The conductivity of semiconductor is sensible.The conductivity of insulator is very low.

Wednesday, 4 January 2017

Difference between Semiconductors and Conductors

Difference between Semiconductors and Conductors Points : Difference between Semiconductors and Conductors, comparision between Semiconductors and Conductors, Semiconductors vs Conductors
Difference between Semiconductors and Conductors
Semiconductors
Conductors
1.Equally resistivity and contract effects are extremely sensitive to tiny change in physical conditions.Both resistivity and contact effects are extremely sensitive to tiny changes in physical conditions.
2.Moving carrier of electric current are originated due to inclusion of thermal radiant or electric energy as of an external source.Current carriers here are free electrons which exist whether outside energy is functional on not.

Sunday, 25 December 2016

Inductance Type Transducers

Inductance Type Transducers Points : inductance type transducers, working of inductance type transducers, construction and working pricipal of inductance type transducers Inductance-type transducer has of main three parts: coil, movable magnetic core, and pressure sensing element. Element is attach to core, and, as pressure vary element cause the core to go inside coil. An AC voltage is apply to coil, and, as core go, Inductance of coil changes. Current through the coil will enhance as inductance reduce.

Friday, 23 December 2016

Bourdon Tube-Type Detector

Bourdon Tube-Type Detector Points : bourdon tube-type detector, working of bourdon tube detector, principle bourdon tube detector Bourdon tube pressure instrument is single old pressure sensing instruments in utilize nowadays. Bourdon tube have of a thin-walled tube to is firmed completely on conflicting sides to create a cross-sectional area elliptical in shape have two long flat sides with two short round sides.

Bellows-Type Detectors

Bellows-Type Detectors Points : bellows-type detectors, principle of bellows-type detectors, working of bellows-type detectors, construction of bellows-type detectors The necessitate for pressure sensing element that was enormously susceptible to small pressures and give power for make active recording with representative mechanisms effect in increase of metallic bellows pressure sense element. The metallic bellows is the majority precise while measuring pressures as of 0.5 to 75 psig. Though, while use in conjunction by a weighty range spring, a few bellows can be use to calculate pressures of over 1000 psig. Figure proves a basic metallic bellows pressure sensing element.

Friday, 16 December 2016

Advantages of a Condenser in a Steam Power Plant

Advantages of a Condenser in a Steam Power Plant Points : advantages of a condenser in a steam power plant
  1. The intellect of condensate (i.e. condensed steam) as feed for boiler reduces cost of power making.
  2. Temperature of condensate is high than that of fresh water. Thus amount of heat supplied per kg of steam is condensed.
  3. It decrease hotness of exhaust steam and thus additional work can be obtained.

Comparison between Jet and Surface Condensers

Comparison between jet and surface condensers Points : Comparison between Jet and Surface Condensers
Comparison between jet and surface condensers
Jet Condensers
Surface Condensers
1.Condensate is waste.Condensate is necessary.
2.Its maintenance is low.Its maintenance cost is elevated.
3.High power is necessary for water pumping.Less power is necessary for water pumping.

Saturday, 26 November 2016

Protection of Power System - Multiple Choice Question

Protection of Power System - Multiple Choice Question Points : protection of power system multiple choice questions and answers, electrical objective type question answers, mcqs, protection of power system blanks 1. Overheating of a transformer may be due to
(i) overloads
(ii) short-circuits
(iii) failure of cooling system
(iv) all above

2. In an alternator, relay protection is absolutely necessary against
(i) over current
(ii) field failure
(iii) stator winding faults
(iv) none of above

3. When failure of prime-mover takes place3 the alternator
(i) runs as a synchronous motor
(ii) draws some current from the supply
(iii) is in the inverted running mode
(iv) all above

Friday, 11 November 2016

Switchgear - Multiple Choice Questions

Switchgear - Multiple Choice Questions Points : switchgear blanks, switchgear multiple choice questions and answers, electrical objective type question answers, mcqs 1. A circuit breaker performs the function of
(i) detection only
(ii) circuit interruption only
(iii) both detection and circuit interruption
(iv) none of above

2. An arc is produced when the switch of a high-voltage and large-current circuit is
(i) opened
(ii) closed
(iii) opened or closed
(iv) none of above

3. A fuse performs
(i) detection function only
(ii) circuit interruption function only
(iii) both detection and interruption functions
(iv) none of above

Saturday, 29 October 2016

Faults in Power System - Multiple Choice Questions

Faults in Power System - Multiple Choice Questions Points : faults in power system, multiple choice questions and answers, electrical objective type question answers, mcqs 1. The ratings of circuit breakers are generally decided on the basis of
(i) unsymmetrical fault currents
(ii) symmetrical fault currents
(iii) normal circuit currents
(iv) none of above

2. The most common fault on an overhead transmission line is
(i) single line to ground fault
(ii) three phase short-circuited fault
(iii) double line to ground fault
(iv) line to line fault

3. Reactors are used at various locations in the power system to
(i) increase short-circuit current
(ii) avoid short-circuit current
(iii) limit short-circuit current
(iv) none of above

Saturday, 8 October 2016

Distribution of Electric Power - Multiple Choice Questions

Distribution of Electric Power - Multiple Choice Questions Points : distribution of electric power, multiple choice questions and answers, electrical objective type question answers, mcqs 1. In the interconnected system, the reserve capacity of the system
(i) remains same
(ii) decreases
(iii) increases
(iv) none of above

2. As compared to overhead system, the underground system
(i) is more costly
(ii) has less chances of faults
(iii) has more useful life
(iv) all above

3. In primary distribution lines, the earth wire is placed
(i) above the phase conductors
(ii) below the phase conductors
(iii) inbetween the phase conductors
(iv) none of above