Theory Examination (Semester-IП) 2015-16 BASIC ELECTRICAL ENGINEERING
This question paper checks a student’s understanding of basic electrical circuits, AC fundamentals, power measurement, transformers, DC machines, induction machines, synchronous machines, and electrical instruments.
It is divided into three sections—definitions, numericals, and long descriptive questions.
SECTION – A (10 × 2 = 20 Marks)
This section contains brief conceptual questions.
Topics include:
Active vs passive elements
Maximum power transfer with internal resistance
R.m.s. value & frequency of sinusoidal current
Active, reactive & apparent power
Power factor in two-wattmeter method
Non-linear scale of MI instruments
Air-gap flux and ampere-turns
Transformer resistance referred to primary
Torque–speed characteristics of DC series motor
Slip–torque characteristics of induction motor
This part tests fundamental electrical engineering concepts.
SECTION – B (5 × 10 = 50 Marks)
Students must solve any five medium-length questions including circuit analysis, diagrams, and calculations.
Topics include:
Loop analysis for current calculation
Average & RMS value of a given voltage waveform
Torque–speed diagram of DC series motor
Slip–torque characteristics of induction motor
Resonance in series RLC circuits & resonant frequency
Three-phase delta-connected coils: current, power factor & total power
Construction & working of PMMC instrument
Transformer losses, efficiency & maximum-efficiency condition
DC shunt motor: induced EMF, currents, power & torque
Magnetic circuit terms like MMF, reluctance & flux density
This section tests problem-solving ability, diagrams, and conceptual clarity.
SECTION – C (2 × 15 = 30 Marks)
Students must attempt any two long-answer questions.
Topics include:
Maximum Power Transfer Theorem
Statement, proof, and numerical application
Single-Phase Induction Motor
Non-self-starting nature (double revolving field theory)
Capacitor-start and capacitor-run methods
Applications
Three-Phase Synchronous Motor
Why it is not self-starting
Role of damper winding
These questions evaluate deep understanding, derivations, diagrams & machine theory.
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