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What causes diodes to fail in alternator?

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Description :

Do Zener diodes have polarity?

Answer :

Yes, Zener diode have polarity Anode(+) and Cathode (-). And Zener Diode are connected into circuit with their cathode as positive terminal because they operate in reverse bias mode.

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Description :

What causes lights to dim in house?

Answer :

While taking a more load from other Equipment

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Answer :

Transformer noise is generated due to vibration of core and winding this is because of magnetostriction and magnetomotive force.

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Description :

What causes random power outages?

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Description :

What are the main causes of harmonics?

Answer :

Harmonic is a non linear load because linear load voltage deviated due to connection of some electrinie device such as converter,inverter

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Description :

What causes transients?

Answer :

Transient is a peak voltage take small period. It will occur due to lightning

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Description :

What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these

Answer :

What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these

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Description :

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

Answer :

In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.

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Description :

State the external causes of failure of electrical equipment.

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Answer :

An alternator coupled to a hydraulic turbine runs at slow speed, as compared to others.

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Description :

Is the speed of alternator is directly proportional to frequency?

Answer :

Yes, speed of alternator is directly proportional to frequency.

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Description :

At which power factor alternator is said to be overexcited?

Answer :

At leading power factor alternator is said to be overexcited.

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Description :

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

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.

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Description :

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor will fall back in phase with respect to the other machine (C) Its portion of share in load will increase (D) Its power factor would be decreased.

Answer :

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then Its portion of share in load will increase

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Description :

The magnitude of various voltage drops that occur in an alternator depends on?

Answer :

The magnitude of various voltage drops that occur in an alternator depends on load current.

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Description :

In alternator where the voltage drop occurs?

Answer :

In alternator voltage drop occurs in armature resistance, leakage reactance, and armature reactance.

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Description :

State working principle of alternator. State the meaning self and separate excitation. 

Answer :

Working principle of alternator: When a conductor is moved in magnetic field or a magnetic field moved with respect to conductor, according to Faraday's law of electromagnetic induction, the conductor ... like battery or shaft-mounted exciter, then the excitation is said to be separate excitation.

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Description :

Draw equivalent circuit of alternator.

Answer :

Equivalent circuit of alternator

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Description :

Explain the construction of alternator with neat diagram.

Answer :

Diagram: Construction of three phase alternator: Construction wise, an alternator generally consists of field poles placed on the rotating fixture of the machine i.e. rotor as shown in the ... of rotor used in construction of alternator, 1. Salient pole type. 2. Cylindrical rotor type. 

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Alternator

Answer :

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Description :

The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is (A) 2/3 (B) 5/6 (C) 7/8 (D) 6/7

Answer :

The fractional-pitch used for eliminating 7th harmonic from the emf wave of an alternator is 6/7

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Description :

The power factor of an alternator depends on?

Answer :

The power factor of an alternator depends on load.

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Description :

Why donor and receiver atoms can't move when sufficient voltage is supplied if they have charge Thanks

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Description :

Which one of the following is not a definition of error ? (A) It refers to the discrepancy between a computed, observed or measured value and the true, specified or theoretically correct value. (B) It refers to the actual output of a software and the correct output. (C) It refers to a condition that causes a system to fail. (D) It refers to human action that results in software containing a defect or fault. 

Answer :

(C) It refers to a condition that causes a system to fail.

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Description :

Which of the following diodes is limited to the reverse-bias region in its region of operation?  (1) Schottky (2) Tunnel (3) Photodiode (4) Rectifier

Answer :

Photodiode is limited to the reverse-bias region in its region of operation.

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Description :

In IC, transistors are utilised as diodes.To get highest breakdown voltage for such diode, it is adjusted to have  A) Ie=0 B) Ic=0 C) Vcb=0 D) Vce=0 

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Description :

In which region is the operating point stable in tunnel diodes?  (1) Negative-resistance (2) Positive-resistance (3) Both negative- and positive-resistance (4) Neither negative- nor positive-resistance

Answer :

In Negative-resistance region is the operating point stable in tunnel diodes.

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Answer :

Excessive high voice signal may cause overmodulation. Modulating component greater than carrier may cause overmodulation. Setting the gain of the microphone too high may cause overmodulation.

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Description :

Silicon is not suitable for fabrication of light emitting diodes because it is : a. An indirect band gap semiconductor b. A direct band gap semiconductor c. A wide band gap semiconductor d. A narrow band gap semiconductor

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Description :

For Gunn diodes, semiconductor material preferred is  (a) Silicon (b) Germanium (c) Gallium Arsenide (d) all of these

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Description :

"In order to succeed you must fail so that you know what not to do the next time." - Anthony J. D'Angelo  

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Description :

What would cause a diode to fail?

Answer :

Supply voltage beyond its limit

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Description :

Answer :

The skin effect causes current to flow Near the surface of the conductor

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Description :

The voltage regulation of an alternator having 0.75 leading p.f. load, no-load induced e.m.f. of 2400V and rated terminal voltage of 3000V is —————————————  A) 20% B) —20% C) 150 D) -26.7

Answer :

-20

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Description :

"Not many people are willing to give failure a second opportunity. They fail once and it is all over. The bitter pill of failure is often more than most people can handle. If you are willing to accept failure and learn from it, if you are willing to consider failure as a blessing in disguise and bounce back, you have got the essential of harnessing one of the most powerful success forces." - Joseph Sugarman

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Description :

If students alleged you for making favouritism in evaluation, how can you deal with this problem? Options: A) Giving threat to fail them B) Making efforts to reveal the position fairly C) Adopting punitive measures D) Showing the student's answer-books in order to satisfy them

Answer :

D) Showing the student's answer-books in order to satisfy them 

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Description :

Which of the following set of statements represents acceptable propositions in respect of teaching-learning relationships? Choose the correct code to indicate your Answer. (i) When students fail in a test, it is the teacher who fails. (ii) Every teaching must aim at ensuring learning. (iii) There can be teaching without learning taking place (iv) There can be no learning without teaching. ... ) (i), (ii), (iii) and (v) (C) (iii), (iv), (v) and (vi) (D) (i), (ii), (v) and (vi)

Answer :

Answer: B

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Description :

According to the Better Business Bureau, if you fail to advertise the highest price in a range of prices for a service or product as prominently as that of the lowest, it violates the New York Consumer Protection Law. (A) if you fail to advertise the highest price in a range of prices for a service or product as ... service or product as the lowest (E) failing to advertise as prominently the highest price in a range of prices for a service or products as that of the lowest 

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Answer :

A voltage signal 10 Sinwt is applied to the circuit with ideal diodes, as shown in figure. The maximum and minimum values of the output waveform vout of the circuit are respectively +4V and-7V

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Description :

What is the pitch factor of a 4 pole alternator having 36 slots and a coil span of 1 to 8?  (A) 140° (B) 80° (C) 20° (D) 40°

Answer :

C

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Answer :

Which type of fading causes serious distortion of modulated signal: Selective fading.

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Description :

"I would rather attempt something great and fail than attempt to do nothing and succeed." - Robert Schuller

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Description :

"Only those who dare to fail greatly can ever achieve greatly." - Robert F. Kennedy

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Description :

"Men are born to succeed, not to fail." - Henry David Thoreau  

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Description :

"People who are afraid to fail can never experience the joys of success." - Pete Zafra

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Description :

Software safety is a ................... activity that focuses on the identification and assessment of potential hazards that may affect software negatively and cause an entire system to fail. (A) Risk mitigation, monitoring and management (B) Software quality assurance (C) Software cost estimation (D) Defect removal efficiency

Answer :

(B) Software quality assurance

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Description :

Software safety is quality assurance activity that focuses on hazards that (A) affect the reliability of a software component (B) may cause an entire system to fail. (C) may result from user input errors. (D) prevent profitable marketing of the final product

Answer :

(B) may cause an entire system to fail.

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Description :

The seeds of certain plants fail to germinate if they do not pass through the digestive tract of fruit-eating birds. This is due to (1) hibernation (2) seed coat impermeability (3) infertility (4) vegetative reproduction 

Answer :

seed coat impermeability

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Description :

Consider the following statements with regard to power diodes : 1. The breakdown voltage is directly proportional to the doping density of the drift region. 2. Losses in the diode are less due to conductivity modulation of the drift region in the on -state. 3. The vertically oriented structure supports large blocking voltages. Which of the above statements is/are correct ?

Answer :

Consider the following statements with regard to power diodes : 1. The breakdown voltage is directly proportional to the doping density of the drift region. 2. Losses in the diode are less due to ... large blocking voltages. Which of the above statements is/are correct ? 2 only

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