KTU SAMPLE QUESTIONS BASIC ELECTRICAL

BASIC ELECTRICAL – QUESTIONS
PART – A

MODULE – 1
1) State and explain Kirchhoff’s laws for an electric circuit.
2) Determine the potential difference to be applied across a conductor resistance 12Ω , so that a current of 15A may flow through it.
3) Define: (i) Resistance (ii) Current (iii) Voltage (iv) Constant current source (v) Voltage source.
4) A periodic voltage waveform has been shown. Determine i) frequency of the waveform; ii) wave equation for 05) Why domestic appliances are connected in parallel? Give comparison with series circuit.
6) State Kirchoff’s voltage law.

MODULE – 2
7) Define RMS and average value of a waveform. What do you mean by form factor?
8) A coil consist of 2000 turns of copper wire having cross sectional area of 0.8mm2. The mean length per turn is 80cm, and the resistivity of copper is 0.02μΩm. find the resistance of the coil.
9) Define RMS and average value of a waveform. What do you mean by form factor? 10) State and explain Kirchoff’s law. (June 2012 Cusat)
11) Explain the generation of alternating voltages and currents.
12) Define: (a) Magnetic force; (b) Magnetic reluctance; and (c) Relative permeability.
13) Define the term coefficient of coupling and write an expression for it.
14) Write any three comparisons of electric and magnetic circuits.

MODULE – 3
15) Distinguish between star and delta connection in three phase circuits.
16) Find the form factor for half wave rectified alternating current.
17) An alternating voltage V= (100+j80) volts is supplied to a circuit and the current flowing I= (-5+j12) Ampere. Find the impedance of the circuit.
18) A series RL circuit takes 384W at a power factor of 0.8 lagging from 120V, 60Hz supply. What are the values of R and L?
19) Explain the following:
1. Active power. 2. Reactive power
20) What are 3-wire and 4-wire systems ? Explain with examples.
21) Distinguish between star and delta connection in three phase.

MODULE – 4
22) What are the advantages of high voltage transmission?
23) What is meant by primary and secondary transmission and distribution system?
24) Write three types each of the conventional and non-conventional energy sources.
25) What is the need for high voltage transmission? What advantages does it offer?
26) List and explain the factors to be considered in selection of sites for hydroelectric stations.
27) Compare and contrast the underground and overhead power distribution.
28) Explain different types of tariffs.

MODULE – 5
29) Explain the working principle of transformer.
30) What are the losses occurring in a transformer?
31) The no-load ratio of 50Hz single phase transformer is 6000/250V. Compute the number of turns in each winding, if the maximum flux is 0.06Wb in the core.
32) Define the e.m.f equation of d.c generator.
33) Define mechanical efficiency and electrical efficiency of a dc generator. State the condition for the maximum efficiency.
34) What is meant by slip in an induction motor? What is its practical significance?
35) Explain the working principle of a dc generator.
36) Rotating field of rotor and stator of induction motor are stationary with respect to each other. Justify the statement.

MODULE – 6
37) Explain (i) Circuit breakers (ii) Fuses
38) Give the schematic layout of an LT switch board?
39) Explain why electrical equipments should be earthed?
40) Explain the working of mercury vapour lamp.

PART-B WILL BE UPDATED SOON.
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