PE & I assignment questions and question bank(CIE-I)

GURU NANAK DEV ENGINEERING COLLEGE, BIDAR

E & CE DEPARTMENT

Sub Name: Power Electronics & Instrumentation                  Subject Code: 18EC36 Academic Year:2019-20                                                     Sem : III A&B

                                    Assignment questions

Module-1

1)      Mention and explain the different types of power electronic converter systems.                                                                                                                - CO1

2)      Sketch V-I characteristics of an SCR and explain latching current, holding current and Break over voltage.                        `                                                           - CO1

3)      Identify the reliable voltages and current limits used to operate the SCR in safe operating region by referring gate characteristics of SCR.                - CO2

4)      Compare  natural and forced commutation and explain class-A self-commutation with the help of neat sketch.                                                             - CO1

5)      With circuit diagram & output waveform analyze the turning ON of the SCR by using RC firing circuit.                                                                          - CO3

6)      With circuit diagram & output waveform analyze the turning ON of the SCR by using UJT firing circuit.

Module-2

1)      Explain the operation of step down chopper(with necessary circuit and waveform) and determine the average and RMS output voltage.                   -CO4

2)      Explain working principle of step-up/down chopper and derive the expression for average output voltage.                                                                        -CO1

3)      With circuit diagram & output waveform analyze the performance of single phase full wave controlled rectifier feeding inductive load.                     -CO3

4)      Explain the operation of single phase half wave controlled rectifier (with necessary circuit and waveform) and determine the average and RMS load voltage.                                                                                                                -CO4

GURU NANAK DEV ENGINEERING COLLEGE, BIDAR

E & CE DEPARTMENT

Sub Name: Power Electronics & Instrumentation                  Subject Code: 18EC36 Academic Year:2019-20                                                     Sem : III A&B

                                                Question Bank

            Module-1

1. With the help of neat block diagram explain power electronic system. - CO1
2. Mention and explain the different types of power electronic converter systems.                                                                                                                - CO1
3. Sketch V-I characteristics of an SCR and explain latching current, holding current and Break over voltage.                        `                                                      - CO1
4. Identify the reliable voltages and current limits used to operate the SCR in safe operating region by referring gate characteristics of SCR.         - CO2
1. Mention and explain various turn on methods used to turn on SCR, which is universal method and why?                                                                         - CO1
2. Explain the turn-off mechanism of SCR with necessary waveform. - CO1 
3. Compare  natural and forced commutation and explain class-A self-commutation with the help of neat sketch.                                                             - CO1
4. Explain the operation of class-B self-commutation with the help of circuit diagram and waveforms.
5. With circuit diagram & output waveform analyze the turning ON of the SCR by using RC firing circuit.                                                                          - CO3
6. With circuit diagram & output waveform analyze the turning ON of the SCR by using UJT firing circuit.

Module-2

1.      Explain the operation of step down chopper(with necessary circuit and waveform) and determine the average and RMS output voltage.                   -CO4

2. Explain working principle of step-up/down chopper and derive the expression for average output voltage.                                                                        -CO1
3. Explain working principle of step up chopper and derive the expression for average output voltage.                                                                                              -CO1

4.      Explain working principle of step-up/down chopper and derive the expression for average output voltage.                                                                        -CO1

5.      With circuit diagram & output waveform analyze the performance of single phase full wave controlled rectifier feeding inductive load.                     -CO3

6.      Explain the operation of single phase half wave controlled rectifier (with necessary circuit and waveform) and determine the average and RMS load voltage.                                                                                                                -CO4

7.      Analyze the effect of freewheeling diode in half wave rectifier with necessary circuit diagram and waveform.                                                       -CO3

PE & I syllabus

  

LINEAR INTEGRATED CIRCUITS 

                                                                         

LINEAR INTEGRATED CIRCUITS 

Course Objectives:

^Ø  Design of OPAMPS, Classification of OPAMPs.

^Ø   To study and design various linear applications of OPAMPs.

^Ø   To study and design various non linear applications of OPAMPs

Course Outcomes:

^Ø  Understand the basic building blocks of linear integrated circuits and its characteristics.

^Ø  Analyze the linear, non-linear and specialized applications of operational amplifiers.

^Ø  Understand the theory of ADC and DAC.

^Ø   Realize the importance of Operational Amplifier.

Sample and Hold Circuit

The sample and hold circuit, as its name implies samples an i/p signal and holds on to it last sampled value until the i/p is sampled again. Below fig shows a sample and hold circuit using an op-amp with an E- MOSFET. In this circuit the E-MOSFET works as a switch that is controlled by the sample and control voltage Vs, and the capacitor C serves as a storage element.

The analog signal Vin to be sampled is applied to the drain, and sample and hold control voltage Vs is applied to the gate of the E-MOSFET. During the positive portion of the Vs, the EMOSFET conducts and acts as a closed switch. This allows i/p voltage to charge capacitor C. In other words input voltage appears across C and in turn at the o/p as shown in above fig.2.9.On the other hand, when Vs is zero, the EMOSFET is off and acts as open switch. The only discharge path for C is, through the op-amp. However the i/p resistance of the op-amp voltage follower is also very high; hence the voltage across C is retained.

The time periods Ts of the sample-and-hold control voltage Vs during which the voltage across the capacitor is equal to the i/p voltage are called sample periods. The time periods TH of Vs during which the voltage across the capacitor is constant are called hold periods. The o/p of the op-amp is usually processed/ observed during hold periods. To obtain the close approximation of the i/p waveform, the frequency of the sample-and-hold control voltage must be significantly higher than that of the i/p.

                Fig.1.30: sample and hold circuit Fig 1.38 I/P and O/P wave forms

pe ppt

pe qp

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ofc qp

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