B.TECH - Semester 4 electrical technology Question Paper 2019 (jun)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- A b-pole, $12 \mathrm{kw}, 240 \mathrm{v}$ dc machines is wave - connected. If this machine is now lap connected, all other things remaining the same, calculate the voltage and current ratings.
- When a dc motor produces maximum output power?
- What are the different types of losses in a dc machine?
- What is meant by regulation of a transformer?
- Why tappings are provided in the hv windings of a transformer?
- What are the various types of starters used for squirrel cage rotors?
- What are the losses that take place in an alternator?
- What are the advantages of stepper motor?
- What are the various methods of speed control?
- Write short notes on electric traction. ## (Answer any one full question from each module)
- (a) Illustrate the methods of excitation of dc machines. ..... 10
- (b) Give the applications of different types of dc generators with reasons andjustification.10
- (a) Draw the torque-speed characteristics for the different types of dc motors. ..... 12(b) When running on no-load, a 400 V shunt motor take 5 A . ArmatureResistance is $0.5 \Omega$ and field Resistance $200 \Omega$. Find output of the motor andeffi...
- (a) Explain construction and principle of operation of auto transformer. ..... 8
- (b) Derive the emf equation of $1 \phi$ transformer and explain voltagetransformation Ratio.12
- (a) Draw the equivalent circuit of a $3 \phi$ induction motor and explain the significance of each element. ..... 10
- (b) Explain the procedure for conducting no load test and blocked rotor test of athree phase induction motor.
- (a) Explain about split phase motor and capacitor start motor. ..... 10
- (b) Explain briefly about the construction and operating principle of ..... $1 \phi$induction motor.10
- (a) Discuss the different methods of starting a synchronous motor. ..... 12(b) What is a synchronous condensor? Show the region of operation of thecondensor on V curves. Discuss the application of synchronouscondensors.
- (a) What are the various types of motors used in traction system? Explain anytwo.10
- (b) Discuss any two methods of speed control in traction motors. ..... 10
- (a) Explain the different types of electric welding. ..... 15
- (b) Write short note on functional schematic of ac electric locomotives. ..... 5