(SEM I) THEORY EXAMINATION 2021-22 BASIC ELECTRICAL ENGINEERING

This question paper for BASIC ELECTRICAL ENGINEERING (KEE101T) is divided into three main sections — A, B, and C, and students must attempt all sections. The paper includes both theoretical and numerical problems covering core electrical engineering concepts.

SECTION A — Very Short Answer Questions (20 Marks)

Students must answer all 10 questions, each of 2 marks.

Topics include:

Use of form factor and peak factor

Speed ratio of synchronous motor

Difference between EMF & potential difference

Definition of power factor

Validity of superposition theorem for power

Need of commutator in DC generator

Why transformers are rated in VA

No-load phasor diagram of transformer

Torque–slip relationship in induction motor

Difference between synchronous & asynchronous motors

SECTION B — Short Answer / Numerical Questions (30 Marks)

Students must attempt any three questions.
Each question carries 10 marks.

Topics include:

EMF equation of transformer & condition for max efficiency

Important parts of DC motor + EMF calculation of DC generator

Thevenin’s theorem and finding current in a resistor

Nodal analysis for finding voltage & current

Superposition theorem to determine branch current

SECTION C — Long Answer / Numerical Questions (50 Marks)

Students must attempt ONE question from each group (Q3, Q4, Q5, Q6, Q7).
Each long question carries 10 marks.

Q3: Network Reduction / Norton Equivalent

Equivalent resistance by network reduction

Norton’s theorem to find output voltage

Q4: AC Circuits / Resonance / Impedance

RLC series circuit resonance, Q-factor, bandwidth

Parallel impedance calculation → admittance, current, power factor

Q5: Transformer Performance

No-load test parameters: core loss, magnetizing current, power factor

Principle of operation of single-phase transformer

Q6: DC Machines

EMF of DC generator (wave vs lap winding)

Full-load speed of DC shunt motor

Q7: AC Machines & Electrical Protection

Slip–torque characteristics of 3-phase induction motor

Finding slip & speed using rotor emf frequency

Short notes on MCB, MCCB, and battery characteristics