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.

Description : What is an alternator?

Answer : Ans. Alternator is a machine which converts mechanical energy into electrical energy

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 : 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 : 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.