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What causes diodes to fail in alternator?

Diode already fail

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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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Answer : While taking a more load from other Equipment

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

Description : What causes random power outages?

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

Description : What causes transients?

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

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

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.

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

Description : Is the speed of alternator is directly proportional to frequency?

Answer : Yes, speed of alternator is directly proportional to frequency.

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 : State the external causes of failure of electrical equipment.

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.

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 ... (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

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.

Description : In alternator where the voltage drop occurs?

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

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.

Description : Draw equivalent circuit of alternator.

Answer : Equivalent circuit of alternator

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. 

Description : Alternator

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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

Description : The power factor of an alternator depends on?

Answer : The power factor of an alternator depends on load.

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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 ... 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.

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.

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 

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.

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 : 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 : What would cause a diode to fail?

Answer : Supply voltage beyond its limit

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Description : 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

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

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

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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 ... vertically oriented structure supports large blocking voltages. Which of the above statements is/are correct ?

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