B.TECH - Semester 8 electrical drives and control Question Paper 2013 (apr)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Explain how voltage is developed in shunt connected DC generator.
- Explain the speed torque characteristics of DC series motor.
- Explain the construction of single phase induction motor.
- List the important specification of MOSFETS.
- Explain how a power IGBT can be protected against $\frac{d v}{d t}$.
- Explain the principle of operation of two quadrant chopper.
- Derive an expression for average output voltage for single-phase half-wave controlled rectifier.
- What are the advantages of using freewheeling diode in fully-controlled rectifier?
- Draw the circuit diagram of half-bridge inverter and explain its principle of operation.
- What are the differences between single pulse width modulation and Multipulse pulse modulation? ( $10 \times 2=20$ Marks) PART - B Module - I Answer one full question from each module, each module carries 20 marks.
- (a) Describe in details the applications of different types of DC motors with reasons and justifications.
- (b) A long shunt compound generator delivers a load current of 10 A at 230 V , and the resistances of armature, series and shunt fields are $0.02 \Omega, 0.01 \Omega$ and $250 \Omega$ respectively. Calculate the generated emf and armature current. Al...
- (a) Explain the principle of operation of single phase induction motor. List the types of single phase induction motor with neat circuit diagram.
- (b) Explain the types and construction features of three phase induction motor.
- (a) Draw and discuss switching characteristics of an IGBT.
- (b) Explain the design procedure of a gate drive circuit for power BJT.
- (a) Explain the principle of operation of step up chopper. Derive the expressions of output voltages.
- (b) Explain the principle of operation of buck-boost chopper. Derive the expressions of output voltages.
- Derive the expressions of output average voltages and rms output voltages for a fully controlled bridge converter connected with RL load.
- In a single phase half-controlled rectifier connected to RL load having continuous load current with source voltage $\mathrm{V}_{\mathrm{s}}=230 \mathrm{~V}, \mathrm{R}=10 \Omega$ and average output voltage is 110 V by, find its (i) delay angle (ii) ...
- (a) Explain $\mathrm{V} / \mathrm{f}$ control of three phase induction motor drive with necessary equations and performance characteristics.
- (b) Explain the advantages and applications of $\mathrm{V} / \mathrm{f}$ controlled induction motor drives.
- (a) Explain with neat sketch the operation of online and offline UPS.
- (b) With necessary waveforms explain the working of single phase full bridge inverter. ( $4 \times 20=80$ Marks)