Basic Electrical Engineering (BEE) important questionsMost repeated in SPPU papers
These 27 questions appeared in more than one SPPU Basic Electrical Engineering paper we have: 15 papers, from May 2023 to Jan 2026. The most-asked come first. Each one links to the papers it was asked in.
Repeated questions
Endsem questions (23)
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- 4×asked
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Attempt any One. i) Derive the expression for RMS value in terms of its maximum value for sinusoidally varying alternating current. ii) Obtain the expression for instantaneous power in case of purely capacitive circuit and by using this expression, prove that this circuit never consumes power.
- 3×asked
Derive the relationship between the line current and phase current, line voltage and phase voltage, for a balanced three phase STAR connected load across three phase AC supply. Draw the circuit diagram & required phasor diagram. Assume phase sequence RYB and inductive load.
- 2×asked
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- 2×asked
Attempt any One. i) Define MMF and reluctance. An iron ring of mean length 100 cm and cross- sectional area of 120cm 2 with an air gap of 2 mm has a winding of 500 turns. The relative permeability of iron is 600. When a current of 3 A flows in the winding, determine reluctance of iron, reluctance of air gap & magnetic flux. (Neglect magnetic leakage & fringing). ii) State relationship between self-inductance and mutual inductance between two magnetically coupled coils. Calculate mutual inductance and self-inductance of each coil if two coils of 250 and 750 turns respectively. They are wound on iron ring of mean diameter 175mm and cross section area of 750 sq mm with relative permeability of 1500. Assume perfect coupling between two coils.
- 2×asked
- 2×asked
Attempt any One. i) Draw and explain single line diagram for elementary power system and list down any four components associated with electrical power system. ii) Derive the expressions for conversion of a delta connected resistive network into an equivalent star connected resistive network.
- 2×asked
Attempt any One. i) Draw series magnetic circuit with small airgap provided on an iron ring. Also draw an equivalent electrical circuit of this magnetic circuit. Show various electrical and magnetic circuit parameters in both diagrams. Write expression to calculate flux in this magnetic circuit. ii) Define self-inductance and derive expression of energy stored in inductor coil in terms of self-inductance. 2
- 2×asked
Attempt any One. i) Explain power triangle in R-L circuit and estimate three types of powers in a typical motor winding circuit having resistance of 30 ohm and inductive reactance of 40 ohm when connected across 230V AC supply. ii) With the help of diagram show how to get a single-phase supply from a three-phase supply system. Three phase load consist of 100 ohm resistance in each branch and is connected to 3 Ph, 415V, 50Hz supply. Calculate phase voltage, line current, and active power, when load is connected in star and then in delta.
- 2×asked
Attempt any One. i) Explain working principle of transformer. Calculate primary turns, full load secondary current and maximum flux in core of a single-phase transformer having rating of 10kVA 3300V/220V, 50Hz. EMF per turn is 10V. ii) Write formula of copper loss and iron loss in single phase transformer. Full load copper loss and iron loss of a 80KVA, l000V/ 250V, 50Hz, transformer are 1200W and 800W respectively. Calculate efficiency at half load, unity power factor and full load, 0.8 power factor (lagging).
- 2×asked
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Insem questions (4)
- 4×asked
- 3×asked
- 2×asked
- 2×asked
Two coils having turns 1000 and 1500 are placed on common magnetic circuit. A current of 5A in coil-1 produces a flux of 0.2mWb and 80% of this flux links to coil-2 . Find (i) Self Inductance of coil-1 (ii) Mutual Inductance between them.(iii) If this current in first coil is interrupted in o.olsec find self induced emf in coil-1 and mutually induced emf coil-2.
Questions count as repeated when their wording matches closely across papers. Numericals that depend on a figure are left out, since the figure changes from paper to paper.