Visvesvaraya Technological University (VTU) 2007 B.E Electrical and Electronics Engineering Model QP Basc Electrical set 1 - Question Paper

SET - I
MODEL ques. PAPER
06 ELE 15/25 - BASIC ELECTRICAL ENGINEERING
(Answer any five ques. by selecting at lowest 2 ques. from every part.)


PART – A
1a) State and discuss Kirchhoff’s laws. [Marks 6]
b) Prove the relation ranging from the self and mutual inductance [Marks 6]
c) issue on D.C. circuit/magnetic circuit. [Marks 8]

2a) describe the RMS and avg. value of a sinusoidal emf wave and find their
expressions. [Marks 8]
b) describe i) real power, ii) reactive power and iii) apparent power as applied single
Phase a.c circuits. [Marks 6]
c) issue on single phase a.c. circuit. [Marks 6]
3a) List out the advantages of 3 phase system compared to single phase systems. [Marks 4]
b) Show that 2 watt meters are sufficient to measure total power in 3 phase
Balanced circuit . [Marks 8]
c) issue on 3 phase circuits eight

4a) discuss with a neat sketch the working of dynamometer kind wattmeter. [Marks 6]
b) With relevant circuit discuss how a lamp can be controlled from 3 various
points and where it is preferred. [Marks 6]
c) discuss the necessity of Earthing and with a neat sketch any 1 method of

Earthing[Marks 8]
PART - B
5a) discuss with a neat sketch the constructional features of a D.C. machine
and mention the functions of every part. [Marks eight ]
b) discuss the principle of the production of torque in D.C. motors. [Marks six ]
c) issue on D.C.Motors or Generators. [Marks 6]
a) discuss the principle of operation of a single phase transformer. [Marks 4]
b) With relevant diagrams distinguish ranging from the core kind and shell kind

transformers [Marks eight ]
c) issue on transformer. [Marks eight ]
7a) Mention the various kinds of synchronous generators and discuss the
construction of every kind with relevant diagram. [Marks 8]
b) Derive the EMF formula of an alternator. [Marks six ]
c) issue on alternator. [Marks 6]
]8a) discuss why Induction motors never run at synchronous speed. [Marks six ]
b) Compare the squirrel cage kind with the slip ring Induction motor and
mention their applications. [Marks eight ]
c) issue on Induction Motor. [Marks six ]

Earning:   Approval pending.