Basic Electrical Engineering Question Bank
Basic Electrical Engineering Question Bank for End Sem Exam - Prepared by Vivek Malwade Sir
Unit 3 AC Series Circuit
1. Define active reactive and apparent power. state their units. Also draw the power triangle for R-L circuit or R-C circuit. 4M
2. What is series Resonance ? Derive the expression for resonant frequency. 6M
3. Obtain the expression for current, when voltage V = Vmsinwt is applied across Purely Inductive Circuit with waveform for voltage, current and power on common x axis. 6M
4. Obtain the expression for current, when voltage V = Vmsinwt is applied across Purely Capacitive Circuit with waveform for voltage, current and power on common x axis. 6M
5. Obtain the expression for current, when voltage V = Vmsinwt is applied across Purely Resistive Circuit with waveform for voltage, current and power on common x axis. 6M
6. Derive the expression for power, when voltage V = Vmsinwt is applied across R-L series circuit. Draw phasor diagram. 6M
7. Derive the expression for power, when voltage V = Vmsinwt is applied across R-C series circuit. Draw phasor diagram. 6M
8. Define and state the unit of admittance, conductance and susceptance also draw the admittance triangle for Inductive or Capacitive circuit. 4M
9. Define Quality factor, Series resonance. 4M
10. Define the equation for admittance in terms of conductance and susceptance. 4M
Unit 4 Single phase transformer and polyphase circuit
1. What are the losses in transformer. State the parts in which they take place and how to minimize these losses. 6M
2. State the relation between 1) phase voltage and line voltage 2) phase current and line current in case of balanced 3 phase delta load. 6M
3. State the relation between 1) phase voltage and line voltage 2) phase current and line current in case of balanced 3 phase star load. 6M
4. Derive the EMF equation of single phase transformer? 6M
5. What is the phase sequence? State any two application. 3M
6. Define 1) Phase sequence 2) Balanced and Unbalanced load. 3M
7. Why the steel laminations used for construction of transformer core? sketch different types of laminations used for core. 3M
8. Define 1) Transformation ratio 2) Turns ratio 3) Current ratio 4) Efficiency of transformer 5) Voltage regulation of transformer. 6M
9. Compare core type and shell type transformer. 6M
10. State advantages of 3 phase system over single phase system. 6M
11. Explain auto transformer with advantages, disadvantages and application. 8M
Unit 5 DC Circuits
1. Define ideal and practical voltage source. Draw their VI characteristics. 4M
1a. Define ideal and practical current source. Draw their VI characteristics. 4M
2. Derive the equation to convert Delta to Star resistive circuit. 6M
2a. Derive the equation to convert Star o Delta resistive circuit. 6M
3. State and explain KCL & KVL. 6M
4. Define 1) Active and passive network 2) linear and non linear 3) unilateral and bilateral 4) lumped and distributed network. 2M each
5. Write down the steps to find current flowing in branch PQ
1) Using Thevenin's Theorem. 6M
2) Using Superposition Theorem. 6M
5a. State and explain Superposition Theorem. 6M
5b. State and explain Thevenin's Theorem. 6M
Unit 6 Work, Power, Energy and Battery
1. Define resistivity of material and state the factors on which it depends. 3M
2. Prove that effect of temp on RTC. 6M
3. Define insulation resistance and derive the equation for insulation resistance. 6M
4. Define 1) RTC 2) Specific heat capacity 3) Latent heat. 6M
5. Compare Lead acid battery and Lithium ion battery.
6. State the application of lead acid battery. 3M
6a. State the application of lithium ion battery. 3M
7. Explain the operation with construction, chemical reaction during charging and discharging. state its application of lithium ion battery. 6M
7a. Explain the operation with construction, chemical reaction during charging and discharging. state its application of lead acid battery. 6M
8. Explain concept of Depth of Discharge. 4M
9. Write the name of materials used for anode, cathode and electrolytes also state application of lithium ion battery. 6M
9a. Write the name of materials used for anode, cathode and electrolytes also state application of lead acid battery. 6M