BEE
Note:unit wise descriptive questions(theory only problems are not included)
UNIT-1(introduction to electrical engineering)
1. (a) State and explain Ohms law.
2.(a) State and explain Kirchhoff’s laws.
3. (a) write a short notes on basic circuit components.
4.(a) discuss the different Factors on which the resistance is dependent?
5(a).Calculate the resistance of 915 meters length of a wire having a uniform cross- sectional area of 0.77cm2 if the wire is made of copper having a resistivity of 1.7*10-6 ohm-cm.
(b) A wire of 1 m has a resistance of 2 ohms. What is the resistance of second wire, whose specific resistance is double the first, if the length of wire is 3 meters and the diameter is double of the first?
6 (a) Explain the effect of temperature on resistance.
(b)
7. (a)derive the expressions for energy stored in inductor and capacitor
(b)
UNIT-2(Network analysis)
1( a ) Explain different types of elements in detail.
2(a) Three resistances are connected in star, determine its equivalent delta configuration.
3(a) Derive the relation for conversion from delta to star connection.
4(a) state and explain superposition theorem.
5(a) state and explain maximum power transfer theorem.
6 (a) state and explain Thevenin’s theorem
7 (a) explain different energy sources
8 (a).Explain Norton’s theorem
UNIT-3(Alternating quantities)
1.(a) define the following terms
(i)Alternating quantity (ii) R.M.S value (iii) Average value (iv) Form factor (v) In-Phase vectors (vi) Lead-lag vectors
2 (a) Derive the expression for root mean square value of an alternating sinusoidal current wave form I = Im Sin θ.
3(a) Derive the expression for average value of an alternating sinusoidal current wave form
I = Im Sin θ.
4(a) An alternating current is expressed as I = 14.14 Sin 314t. Determine:
- RMS current ii) Average current iii) Form factor iv) Peak factor.
5(a) An alternating current is expressed as I = 14.14 Sin 314t. Determine:
(i)Maximum current ii) RMS current iii) Frequency iv) Instantaneous current when t = 0.02 ms.
6.
UNIT-4(Transformers)1. (a) Explain different losses in case of transformer.
2. (a) Explain the principle of operation of a Transformer
3.(a) Derive the induced e.m.f equation of transformer.
4.(a) explain the constructional details of transformer.
5.(a) explain ideal transformer on no load and practical transformer on no load.
6.(a) explain OC test and SC test on transformer.
7(a) explain practical transformer on load with phasor diagrams.
8(a). Derive maximum efficiency condition and load KVA corresponding to maximum efficiency in transformer