Recent questions tagged reaction

Description : What is the first thing that goes through your mind when you see a blank post?

Last Answer : The person probably thought it would stir up unnecessary conflict on the Q, or was insensitive, and thought better of it shortly after posting. That’s why I usually delete.

Description : In life, what would make you "weak in the knees"?

Last Answer : Oh, I interpret weak in the knees very differently from the examples you gave. Something that gets you excited is the way I take it as in the song lyrics she loved me so naughty made me weak in the ... 's leaving me made me almost weak in the knees but I've have continued being able to walk .

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.

Description : Explain the nuclear chain reaction in a nuclear power plant.

Last Answer : Nuclear chain reaction in a nuclear power plant: If a slow moving neutron hits unstable heavy nucleus of nuclear fuel U235 or Pu239 , the neutron is absorbed, the nucleus splits into two more ... chain reaction can be controlled and desired heat energy can be obtained in nuclear power plant. 

Description : In a 3 -phase alternator, if there is only magnetizing armature reaction, the load is :  (A) capacitive (B) inductive (C) resistive (D) inductive and resistive

Last Answer : In a 3 -phase alternator, if there is only magnetizing armature reaction, the load is : capacitive 

Description : The transfer of energy for reaction turbines is based on _______ A) Newton’s first law B) Newton’s second law C) Newton’s third law D) All the above

Last Answer : The transfer of energy for reaction turbines is based on Newton’s third law

Description : What is the effect of armature reaction? A) Demagnetization of the main field B) Demagnetization of the brushes C) Cross-magnetization of the brushes D) None of these

Last Answer : What is the effect of armature reaction? A) Demagnetization of the main field B) Demagnetization of the brushes C) Cross-magnetization of the brushes D) None of these

Description : The armature reaction in a synchronous generator supplying leading power factor load is (A) magnetizing (B) demagnetizing (C) demagnetizing and cross-magnetizing (D) magnetizing and cross-magnetizing

Last Answer : The armature reaction in a synchronous generator supplying leading power factor load is magnetizing and cross-magnetizing

Description : The ratio of limiting friction and normal reaction is known as?

Last Answer : The ratio of limiting friction and normal reaction is known as coefficient of friction.

Last Answer : Armature reaction in a generator results in demagnetisation of leading pole tip and magnetisation of trailing pole tip.

Last Answer : The demagnetising component of armature reaction in a D.C. generator reduces generator e.m.f.

Last Answer : Armature reaction of an unsaturated D.C. machine is crossmagnetising.