1. Explain the principle of operation of a chopper. Briefly explain time-ratio control and PWM as applied to chopper 2. Explain the working of step down shopper. Determine its performance factors, VA, Vo rms, efficiency and Ri the effective input resistane 3. Explain the working of step done chopper for RLE load. Obtain the expressions for minimum load current Ilmax load current I2, peak – peak load ripple current di avg value of load current Ia, the rms load current Io and Ri. 4. Give the classification of stem down converters. Explain with the help of circuit diagram one quadrant and four auadrant converters

1. Explain the principle of operation of a chopper. Briefly explain time-ratio control and PWM as applied to chopper 2. Explain the working of step down shopper. Determine its performance factors, VA, Vo rms, efficiency and Ri the effective input resistane 3. Explain the working of step done chopper for RLE load. Obtain the expressions for minimum load current Ilmax load current I2, peak – peak load ripple current di avg value of load current Ia, the rms load current Io and Ri. 4. Give the classification of stem down converters. Explain with the help of circuit diagram one quadrant and four auadrant converters

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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In Chopper operation I0 is positive , the direction of power flow will be from ......... to .........
In DC machines, ....................... are made from laminated steel or low carbon steel and used to reduce the armature reaction.
For a power transformer a differential protection scheme was designed as shown in Figure 1. Assume a permissible overload of 10%, and the CT ratios (CTR) are selected based on multiple of 100, and 5 A relay is used, determine: CTR1 BAA Ip -11 1 MVA 33/0.4 kV Rest D 1) CTR1 is 2) CTR2 is.. 3) CT currents Ip and Is are 4) The pilot current in secondary is..... OP Rest I 12 t m[3 m im 3 m/ !_ .and. CTR2 MA टि 5) The interposing CTration (Matching ratio) is.. 6) The spell current required for tripping (assume 30% slope)............ ff Is YA Matching Fig.1
QUESTION 3 а) Describe a static energy component in power electronics fundamental. A single-phase full-wave ac voltage controller working on the ON-OFF control technique b) has a supply voltage of 230 V (RMS) 50 Hz with a purely resistive load that is connected in series as of 35 N and 10 Q. The controller is set to ON-mode for 40 cycles and off for 20 cycles. i) Justify whether the converter is operating at the optimum duty cycle (k) of> 50%. ii) Analyse the capability of the converter in supplying the load at 180 V (RMS).
Exercise 2 A shunt generator delivers 14A at 270V and the resistance of the shunt field and armature are 100 Q and 0.75 Q2, respectively. Calculate: i. The generated emf and the efficiency of this operating condition. ii. The generated emf if the shunt field impedance was triple and if it was double and the efficiency of these cases. iii. What emf could serve tha same active power of load but at load voltage of 240V and the efficiency in this case.
An ideal single-phase source, 240 V, 50 Hz, supplies power to a load resistor R= 100 Ohm by full -wave rectifier (a) Calculate the average and rms values of the current and the power dissipation. (b) Calculate the circuit power factor and the ripple factor.
20. The output of a single phase mid-point rectifier is 20 A, 150 V dc while the input supply voltage is 220 V AC (rms). Find the transformer rating, voltage ratio and transformer primary current. Assume the firing angle to be 30° and the load to be inductive. [Hint. Ref. Ex 4.8] 21. A single phase full controlled bridge is fed from 220 V ac rms supply. The load current for the RL load resistance is 8A and the firing angle is 60°. Calculate the active and reactive inputs. If one of thyristors gets open circuited obtain the aver- age dc output voltage and current for same firing angle. How can you ensure that the load current be continuous ? [Hint. Ref. Ex 4.15] 22. A single phase half wave rectifier alongwith a commutating diode is used to supply a heavily inductive load from a 250 V ac supply. Assuming the load cur- rent to be 15 A, find the average load voltage for a=45°. What is the load resis- tance ? If the firing angle is made 100°, does the load voltage become negative ? [Hint.…
) A chopper circuit drives an inductive load from 120 DC supply. Given the load resistance as 6 0, the average load current as 52.5 A and operating frequency is 450 Hz. When the chopper is ON, 5 V is dropped. Calculate of (a) conduction period (in milliseconds) (b) blocking period of the chopper (in milliseconds) (1. (c) duty cycle of the chopper (d) draw the ON and OFF time period waveform tic (ii) Draw the circuit diagram of the single phase bridge rectifier which is used in four quadrant operation (RL load) and explain its operation. ( Duty Cycle ON period OFF period
A 20 kVA machine has a full load copper loss of 400 W, an iron loss of 150 W, and a mechanical loss of 200 W. Determine:a) Efficiency at 3/4 of full load with f.d.p. 0.8. Ans: 95,43%b) Performance at full load with f.d.p. 0.9. Ans: 96%c) Peak performance apparent power. Ans: 18,71 kVAd) Yield in the previous case for f.d.p. Unit. Ans: 96,39% I need the procedures to get these results. Thanks
Derive the expression of the RMS load voltage for a full wave ac voltage controller operating with an R-L type of load. Assume the load current to be discontinuous.
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Q9/ Complete the blank Commutator in DC machine is made up of .....................................?