B.TECH - Semester 5 electrical drives and control Question Paper 2021 (dec)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Explain the mechanical characteristics of series motor. 2 Brier the working principle of a single phase Induction molor.
- What do you mean by back emf in a dc molor? Explain ils significance.
- What is secondary breakdown in BJTs? How is il avoided?
- Explain the structure of BJT with neat sketches. 6 Explain the switching characteristics of MOSFET. 7 Describe the VI characleristics of IGBT, 9 Explain the working of ON-LINE UPS.
- A single phase full oridge inverter has a resislive load of $2.4 \Omega$ and do input vollage is $\mathrm{Vs}=48 \mathrm{~V}$. Delermine (a) oulput power (b) peak and average current of thyristors (c) poak reverse blocking voltage. Answer any two fu...
- (a) Explain the principle of operation of a DC generator with neal sketches and also derive ils emf equation.
- (b) A shunt generalor delivers 450 A at 230 V and the resislance of the shunt field and armature are $50 \Omega$ and $0.03 \Omega$ respectively, Calculate the generated e.m. P?
- Explain the different types of do generators writh schematic diagram and write the expression for generated emf.
- Explain the construction of a three phase Induction motor and how a rolating magnelic field is produced.
- (a) Draw and explain the VI and Iransfer characterislics of MOSFET. 6
- (b) Explain the requirements of a base drive circuil for BJT.
- Explain the working of single phase half wave controlled converter circuil with $R$ and RL load with necessary skelches.
- (a) Explain the principle of DC motor control. 5
- (b) Describe the principle of PWM switching control. Module - III
- With circuil diagram and waveforms explain the operation of push pull inverter. 10
- (a) Describe stator voluge control of three phase induction molor. ..... 6
- (b) Compare scafar and vector control of Induction molors. ..... 4
- Explain vollage source inverter red induclion molor drive. ..... 10