JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Code.No: RR12302

RR

SET-1

Find the power dissipated in 40 Ω resistor as shown in figure.

3.a)

b) c)

Explain how a P-type semiconductor is formed. What are the different impurities used for this process? Derive the expression for intrinsic conductivity. Explain about charge densities in a semiconductor. [7+4+5] A sinusoidal voltage of peak value 40V and frequency 50Hz is applied to HWR using PN diode. The total load resistor is 800 Ω . Neglecting cut in voltage and using idealized characteristic for the diode with Rf = 8 Ω and Rr = α calculate: i) Peak D.C and RMS values of load current ii) D.C and A.C output power iii) Rectifier efficiency iv) Ripple factor. Derive the formulas used in the above problem. [8+8]

Aj

4.a)

b)

[10+6]

Explain the process of voltage build up in a self-excited D.C machine. List out the various conditions to be satisfied for voltage build up process in a selfexcited machine, and write down remedies if the conditions fail. [8+8]

nt

2.a) b)

or ld

b)

Determine the voltage VAB in the circuit as shown in the figure.

uW

1.a)

.in

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD I B.TECH - SUPPLEMENTARY EXAMINATIONS, JUNE - 2010 ELECTRICAL AND ELECTRONICS ENGINEERING (BIOTECHNOLOGY) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks ---

c)

6.a) b) c)

Compare and contrast of FET and BJT. Give the constructional features of JFET and explain its operation with the help of the drain characteristics. From the drain characteristics derive mutual characteristic and explain the shape of the curve qualitatively. [6+6+4] List out different distortions that occur in amplifiers and discuss. Enumerate the effect of negative feedback on the various characteristics of the amplifier. Draw the circuit diagram of an emitter follower circuit and mention what type of feedback is employed? Justify your answer. [6+6+4] Explain the operation of an integrator using OP-AMPs. Distinguish between positive and negative feedbacks. List out the characteristics of OP-AMP.

8.a) b) c) d)

Distinguish between positive and negative logic. Represent the decimal number 8620 in binary. How do you convert an RS flip-flop into a T-flip-flop? Distinguish between Truth table and excitation table.

[6+4+6]

or ld

7.a) b) c)

.in

5.a) b)

Aj

nt

uW

-oOo-

[4+4+4+4]

Code.No: RR12302

RR

SET-2

2.a)

b) 3.a) b) c)

4.a) b)

Compare and contrast of FET and BJT. Give the constructional features of JFET and explain its operation with the help of the drain characteristics. From the drain characteristics derive mutual characteristic and explain the shape of the curve qualitatively. [6+6+4] List out different distortions that occur in amplifiers and discuss. Enumerate the effect of negative feedback on the various characteristics of the amplifier. Draw the circuit diagram of an emitter follower circuit and mention what type of feedback is employed? Justify your answer. [6+6+4]

nt

c)

A sinusoidal voltage of peak value 40V and frequency 50Hz is applied to HWR using PN diode. The total load resistor is 800 Ω . Neglecting cut in voltage and using idealized characteristic for the diode with Rf = 8 Ω and Rr = α calculate: i) Peak D.C and RMS values of load current ii) D.C and A.C output power iii) Rectifier efficiency iv) Ripple factor. Derive the formulas used in the above problem. [8+8]

or ld

b) c)

Explain how a P-type semiconductor is formed. What are the different impurities used for this process? Derive the expression for intrinsic conductivity. Explain about charge densities in a semiconductor. [7+4+5]

uW

1.a)

.in


Explain the operation of an integrator using OP-AMPs. Distinguish between positive and negative feedbacks. List out the characteristics of OP-AMP.

[6+4+6]

6.a) b) c) d)


[4+4+4+4]

Aj

5.a) b) c)

[10+6]


uW

8.a) b)


.in

b)


or ld

7.a)

Aj

nt

-oOo-

Code.No: RR12302

RR

SET-3

c)

2.a) b) c)

Compare and contrast of FET and BJT. Give the constructional features of JFET and explain its operation with the help of the drain characteristics. From the drain characteristics derive mutual characteristic and explain the shape of the curve qualitatively. [6+6+4]

List out different distortions that occur in amplifiers and discuss. Enumerate the effect of negative feedback on the various characteristics of the amplifier. Draw the circuit diagram of an emitter follower circuit and mention what type of feedback is employed? Justify your answer. [6+6+4]

or ld

1.a) b)

.in



[6+4+6]

4.a) b) c) d)


[4+4+4+4]

5.a)


Aj

nt

uW

3.a) b) c)

b)


6.a) b)


7.a)


b)

.in

or ld

8.a)

A sinusoidal voltage of peak value 40V and frequency 50Hz is applied to HWR using PN diode. The total load resistor is 800 Ω . Neglecting cut in voltage and using idealized characteristic for the diode with Rf = 8 Ω and Rr = α calculate: i) Peak D.C and RMS values of load current ii) D.C and A.C output power iii) Rectifier efficiency iv) Ripple factor. Derive the formulas used in the above problem. [8+8]

uW

b) c)

[10+6]

Aj

nt

-oOo-

Code.No: RR12302

RR

SET-4


2.a) b) c) d)


3.a)


uW


[4+4+4+4]

[10+6]

nt

b)

[6+4+6]

or ld

1.a) b) c)

.in



5.a)


Aj

4.a) b)

b) c)

7.a) b) c)

8.a) b) c)

.in

b)

A sinusoidal voltage of peak value 40V and frequency 50Hz is applied to HWR using PN diode. The total load resistor is 800 Ω . Neglecting cut in voltage and using idealized characteristic for the diode with Rf = 8 Ω and Rr = α calculate: i) Peak D.C and RMS values of load current ii) D.C and A.C output power iii) Rectifier efficiency iv) Ripple factor. Derive the formulas used in the above problem. [8+8] Compare and contrast of FET and BJT. Give the constructional features of JFET and explain its operation with the help of the drain characteristics. From the drain characteristics derive mutual characteristic and explain the shape of the curve qualitatively. [6+6+4]

List out different distortions that occur in amplifiers and discuss. Enumerate the effect of negative feedback on the various characteristics of the amplifier. Draw the circuit diagram of an emitter follower circuit and mention what type of feedback is employed? Justify your answer. [6+6+4]

or ld

6.a)

Aj

nt

uW

-oOo-