JNTUH 2-1 (Computer Science And Engineering-BEE) Important Questions Unit Wise

BASIC ELECTRICAL ENGINEERING

IMPORTANT QUESTIONS UNIT WISE

UNIT-1

1.Ohm's law
2.kirchhoff's current law and Kirchhoff voltage law
3.series and parallel circuit
4.merits & demerits of series circuit
5.super position theorem with problem
6.thevenin's theorem with problem
7.maximum power transformation theorem with problem
8.star to delta and delta to star equations


UNIT-2

1.define:
  a.alternating quantity
  b.R.M.S value
  c.form factor
  d.average value
2.derive an expression for RMS value of an alternating sinusoidal current wave form
3.behaviour of A.Cthrough
   a.Pure R
   b.Pure L
   c.Pure C circuits
   For each case derive the instantaneous value of V and I,Impedance,Average power,power factor,instantaneous power and the relevant phasors
4.behaviour of A.C Through RC series circuits
5.average value and RMS value
6.different types of voltage and current sources

UNIT-3

1.principal of operation of a transformer
2.constructional details of transformer
3.emf equation for a 1-phase transformer
4.draw the phasor diagram of a transformer at no load and at full load lagging power factor conditions and explain the operation of a transformer
5.difference between an ideal transformer and pratical transformer
6.ideal transformer?draw it's no Lord phasor diagram
7.define regulation
8.source of transformation
9.voltage regulation of a transformer.expression for the voltage regulation
10.various losses occur in a transformer
11.transformer rated in KCA ?
12.induction motor called a rotating transformer?


UNIT-4

1.mention the main parts of a DC machine and explain with help of neat diagram
2.motoring and generating actions of a D.C Machine
3.explain different methods of excitation of D.C generators with suitable diagrams
4.derive from first principles an expression for the e.m.f induced in the armature of the D.C machine
5.torque equation of DC motor
6.speed current and speed torque characteristics of D.C shunt motor
7.derive how rotating magnetic field is developed in a 3-phase induction motor
8.principal of a simple loop D.C generator
9.define phase / phase difference
10.purpose of magnetic yoke in a D.C machine
11.expression for induced e.m.f of D.C generator
12.similarities between motors and generators
13.essential requirements of shunt


UNIT-5

1.classification of electrical instruments
2.explain the following with reference to the indicating indruments
  a.deflecting torque
  b. Controlling torque
  c.Damping torque
  d.Scale and pointer
3.spring control system and gravity control system
4.neat diagram,explain the process of eddy current damping
5.attraction type and repulsion type instruments?explain
6.scale of an M.I instrument non-uniform?explain
7.advantages and disadvantages of M.I and M.C instrument
8.errors occurring in a moving iron instrument
9.define slip speed / slip
10. Advantages and disadvantages of Spring control
11.with neat diagram the working principle of PMMC instrument


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