(R09) Supplementary Examinations January/February 2014

R09
Code: 9AHS701
B.Tech III Year II Semester (R09) Supplementary Examinations January/February 2014
MANAGEMENT SCIENCE
(Common to EEE and ECC)
Time: 3 hours
Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1
Explain the concept of management, administration and organization.
2
Discuss the features of line and staff organizations with a chart.
3
(a)
(b)
(c)
What do you understand by product layout?
Analyse the advantages and disadvantages of product layout.
For what type of works they can be followed?
4
(a)
(b)
Discuss the parameters and principles of scientific purchasing.
Discuss the various buying techniques.
5
Stat the principles of job evaluation and also enumerate the various steps involved in job
evaluation procedure.
6
Given the following information workout the minimum duration of the project and the
corresponding cost.
Activity Job Normal time(days) Crash time (days) Normal cost(Rs) Crash Cost(Rs)
A
1-2
10
6
400
600
B
1-3
4
2
100
140
C
2-4
6
4
360
440
D
3-4
8
4
600
900
E
2-5
8
6
840
1100
F
4-6
6
2
200
300
G
5-6
10
8
1200
1400
7
Explain the strategies to improve sales performance of a strategic business unit.
8
Explain the following terms in reference to quality control:
Producer’s risk.
Consumer’s risk.
Average outgoing quality.
Single sampling plan of inspection.
*****
(a)
(b)
(c)
(d)
Set No. 1
Code No: RR410202
IV B.Tech I Semester Supplimentary Examinations, November 2008
POWER SEMI CONDUCTOR DRIVES
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆⋆⋆⋆⋆
1. (a) What is the purpose of a free wheeling diode in converters when fed to DC
motors.
(b) A 1 φ, half controlled converter is fed from a 120V rms, 60 HZ supply and
provides a variable dc voltage at the terminals of a dc motor. The thyristor
is triggered continuously by a dc signal. The resistance of armature circuit is
10 Ω and because of fixed motor excitation and high inertia, the motor speed
is considered constant so that the back emf is 60V. Find the average value of
the armature current neglecting armature inductance.
[8+8]
2. Describe the relative merits and demerits of the following types of braking for dc
motors: mechanical braking, dynamic braking and regenerative braking with neat
diagram.
[16]
3. (a) Deduce the mathematical expression for minimum and maximum currents for
a class A chopper operated dc motor with back emf.
(b) A 220v, 24A, 1000rpm separately excited dc motor having an armature resistance of 2Ω is controlled by a chopper. The chopping frequency is 500Hz and
the input voltage is 230v. Calculate the duty ratio for a motor torque of 1.2
times rated torque at 500rpm.
[8+8]
4. (a) Explain why stator voltage control is suitable for speed control of Induction
motors in fan and pump drives. Draw a neat circuit diagram for speed control
of scheme of 3 phase Induction motor using AC Voltage Controller.
(b) A 440V, 3 phase, 50 Hz 6 pole 945 RPM delta connected Induction Motor has
the following parameter referred to the stator.
RS = 2.0Ω, Rr = 2.0Ω, XS = 3Ω, Xr = 4Ω.
When driving a fan load at rated voltage it runs at rated speed. The motor speed is controlled by stator voltage control. Determine motor terminal
voltage, current and torque at 800 RPM.
[8+8]
5. The equivalent circuit of a three phase Induction motor having a delta connected
stator has the following parameters at rated frequency of 50Hz.
r1 = 0.1Ω,
r2 = 0.2Ω,
x1 = 1.0Ω,
x2 = 1.0Ω, xm = 20Ω
The rated voltage of machine is 250V. Determine the voltage to be applied as a
function of stator frequency for rotor frequencies of 0, 2, 3Hz. Consider only the
fundamental.
[16]
1 of 2
Set No. 1
Code No: RR410202
6. (a) How do you explain the operation of an induction motor speed control using
rotor resistance variation?
(b) Explain the operation of an induction motor speed control using a chopper
control.
[8+8]
7. A 400 kW, three phase, 3.3 kV, 50 Hz, unity power factor, 4-pole, star-connected
synchronous motor has the following parameters: armature resistance = 0, synchronous reactance = 12 ohms, rated field current = 10 A. The machine is controlled
by variable frequency at constant V/f ratio. Calculate torque and field current
for rated armature current, 900 rpm and 0.8 leading power factor. Draw motor
characteristics and waveforms under the above method of control.
[16]
8. Describe the open-loop and closed loop methods of speed control of a synchronous
motor using VSI.
[16]
⋆⋆⋆⋆⋆
2 of 2
Set No. 2
Code No: RR410202
IV B.Tech I Semester Supplimentary Examinations, November 2008
POWER SEMI CONDUCTOR DRIVES
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆⋆⋆⋆⋆
1. (a) Explain how four-quadrant operation is achieved by dual converters each of 3
φ full wave configuration for d.c. separately excited motor.
(b) Distinguish between circulating current and non-circulating current mode of
operation.
[10+6]
2. Describe the relative merits and demerits of the following types of braking for dc
motors: mechanical braking, dynamic braking and regenerative braking with neat
diagram.
[16]
3. (a) Explain with neat circuit diagram the basic principle of operation of a class A
type of chopper. The chopper is connected to R-L-E load. Analyze the same
for continuous current mode of operation.
(b) A dc supply of 200v supplied power to separately excited dc motor via a class
A thyristors chopper. The motor has an armature circuit resistance of 0.33Ω
and inductance of 11mH. The chopper is fully on at the rated motor speed
1200rpm when the armature current is 20A. If the speed is to be reduced to
800rpm with the load torque constant, calculate the necessary duty cycle. If
the chopper frequency is 500Hz, is the current continuous?
[8+8]
4. (a) Discuss how the soft start scheme for the 3-phase induction motor drive can
be implemented using ac voltage controllers. Mention the restrictions of this
scheme.
(b) A 440 V, 3-phase, 50 Hz, 6-pole 945 rpm, delta connected induction motor
has following parameters referred to stator side: Rs = 2.0Ω, Rr = 2.0Ω,
Xs = 3.0Ω, Xr = 4.0Ω. Rated voltage is impressed at the terminals for
driving a fan load at rated speed. Stator voltage control employed to get
variable speeds.
i. If the induction motor is running at 800 rpm, determine the motor terminal voltage, current flow into the stator and developed torque,
ii. what is the motor speed, current and torque if the terminal voltage is 280
V.
[8+8]
5. While explaining the principle of varying the speed of 3 phase Induction motor by
v/ method discuss if for the following two different modes.
f
(a) Operation below rated frequency
(b) Operation above rated frequency.
1 of 2
[16]
Set No. 2
Code No: RR410202
6. The speed of a 3-phase slip ring induction motor is controlled by variation of rotor
resistance. The full load torque of the motor is 50Nm at a slip of 0.3. The motor
drives load having a characteristics T α N 2 . The motor has 4 poles and operates
on 50Hz, 400V supply. Determine the speed of the motor for 0.8 times the rated
torque. The operating condition is obtained with additional resistance in the circuit.
The resistance is controlled by chopper in the rotor circuit. Determine the average
torque developed for a time ratio of 0.4.
[16]
7. A 6 MW, three phase, 11 kV, 50 Hz, unity power factor, 6-pole, star-connected synchronous motor has the following parameters: armature resistance = 0, synchronous
reactance = 9 ohms, rated field current = 60 A. The machine is controlled by variable frequency at constant V/f ratio up to base speed and at constant V above base
speed. Calculate the torque and field current for rated armature current, 750 rpm
and 0.8 leading power factor. Draw motor characteristics and waveforms under the
above method of control.
[16]
8. Describe the open-loop and closed loop methods of speed control of a synchronous
motor using VSI.
[16]
⋆⋆⋆⋆⋆
2 of 2
Set No. 3
Code No: RR410202
IV B.Tech I Semester Supplimentary Examinations, November 2008
POWER SEMI CONDUCTOR DRIVES
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆⋆⋆⋆⋆
1. A single-phase fully controlled thyristor converter is supplying a dc separately excited dc motor. Draw the neat waveform diagrams and explain various operating
modes of the drive both in motoring and regenerative braking for
(a) γ < α,
(b) γ > α,
where α: is the firing angle, γ: is the angle at which the source voltage equal
to the motor back emf. Assume the armature of the separately excited dc
motor can be replaced by simple R-L and back emf load.
[16]
2. (a) What is a dual converter? Explain the principle of operation of a dual converter in circulating current mode. How the same is used for speed control of
dc drive.
(b) A 230v separately excited dc motor takes 50A at a speed of 800rpm. It has
armature resistance of 0.4Ω. This motor is controlled by a chopper with an
input voltage of 230v and frequency of 500Hz. Assuming continuous condition
throughout, calculate and plot speed-torque characteristics for:
i. Motoring operation at duty ratios of 0.3 and 0.6.
ii. Regenerative braking operation at duty ratios of 0.7 and 0.4.
[8+8]
3. (a) List the advantages offered by dc chopper drives over line-commutated converter controlled dc drives.
(b) A dc chopper controls the speed of dc series motor. The armature resistance
Ra = 0.04Ω, field circuit resistance Rf = 0.06Ω, and back emf constant Kv =
35 mV/rad/s. The dc input voltage of the chopper Vs=600v. If it is required
to maintain a constant developed torque of Td = 547N-m, plot the motor speed
against the duty cycle K of the chopper.
[6+10]
4. (a) Using 3 phase solid state AC Voltage Controllers explain clearly how it is
possible to achieve 4 quadrant operation of 3 phase Induction motors.
(b) Draw a closed loop block schematic diagram for the above speed control technique. Mention the merits of the above method of speed control.
[8+8]
5. Discuss in detail the role of Cyclo converters for speed control of Induction motor.
Draw neat circuit diagram for speed control of 3 phase Induction motor using Cyclo
converters. Mention the merits and limitations of the above scheme.
[16]
1 of 2
Set No. 3
Code No: RR410202
6. (a) How do you explain the operation of an induction motor speed control using
rotor resistance variation?
(b) Explain the operation of an induction motor speed control using a chopper
control.
[8+8]
7. Discuss the VSI method of speed control of synchronous motor describe the operation of the converter with waveforms.
[16]
8. Describe self-controlled and load-commutated inverter controlled synchronous motor drives in detail and compare them
[16]
⋆⋆⋆⋆⋆
2 of 2
Set No. 4
Code No: RR410202
IV B.Tech I Semester Supplimentary Examinations, November 2008
POWER SEMI CONDUCTOR DRIVES
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
⋆⋆⋆⋆⋆
1. A dc series motor has Ra = 3 Ω, Rf = 3 Ω and Maf = 0.15 H. The motor speed is
varied by a phase-controlled bridge. The firing angle is π /4 and the average speed
of the motor is 1450 rpm. The applied ac voltage to the bridge is 330 Sin wt.
Assuming continuous motor current find the steady state average motor current
and torque. Sketch the waveforms for output voltage, current and gating signals.
[16]
2. (a) Draw the circuit diagram and explain the operation of closed-loop speed control with inner-current loop and field weakening.
(b) A single phase fully controlled double bridge converter is operated from 120v,
60Hz supply and the load resistance is 10 ohms. The circulating inductance is
40mH. Firing delay angle for converter I and II are 600 and 1200 respectively.
Calculate the peak circulating current and the current through converters.
[8+8]
3. (a) Discuss with the suitable diagrams I quadrant and II quadrant choppers.
(b) A constant frequency TRC system is used for the speed control of dc series
traction motor from 220v dc supply. The motor is having armature and series
field resistance of 0.025Ω and 0.015Ω respectively. The average current in the
circuit is 125A and the chopper frequency is 200Hz. Calculate the pulse width
if the average value of back emf is 60 volts.
[8+8]
4. (a) Explain why stator voltage control is suitable for speed control of Induction
motors in fan and pump drives. Draw a neat circuit diagram for speed control
of scheme of 3 phase Induction motor using AC Voltage Controller.
(b) A 440V, 3 phase, 50 Hz 6 pole 945 RPM delta connected Induction Motor has
the following parameter referred to the stator.
RS = 2.0Ω, Rr = 2.0Ω, XS = 3Ω, Xr = 4Ω.
When driving a fan load at rated voltage it runs at rated speed. The motor speed is controlled by stator voltage control. Determine motor terminal
voltage, current and torque at 800 RPM.
[8+8]
5. A three phase, 4 pole, 18 KW, 300V, star connected Induction motor is driven at
50 Hz by a six step voltage source inverter supplied from a DC supply of 200V.
The motor equivalent circuit parameters for 50 Hz operation are
R1 = 0.1Ω, R2 = 0.17Ω, Xl = 0.3Ω, X2 = 0.5Ω, Xm = large.
Calculate the harmonic torques due to the 5th and 7th harmonic currents. Show
that, for operation at 1450 RPM, 50 Hz, the harmonic torques are negligible. [16]
1 of 2
Set No. 4
Code No: RR410202
6. (a) Draw and explain a closed loop operation for a static Kramer controlled drive.
(b) In which way a static Kramer Control is different from static Scherbius
drive?
[10+6]
7. Explain the operation of a synchronous motor fed from an adjustable frequency
current source, with circuit diagram and characteristic curves.
[16]
8. Draw the block diagram of a closed loop synchronous motor drive fed from VSI
and explain.
[16]
⋆⋆⋆⋆⋆
2 of 2
1
Code No: R5410203
IV B.Tech I Semester(R05) Regular/Supplementary Examinations, December 2009
POWER SYSTEM ANALYSIS
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
?????
1. Form the Ybus for the given network:
Bus code
Impedence
p-q
1-2
1-3
2-3
2-4
2-5
3-4
4-5
Zpq
0.02+j0.08
0.08+j0.24
0.06+j0.18
0.06+j0.18
0.04+j0.12
0.01+j0.03
0.08+j0.24
[16]
Linecharging
0
ypq
2
0.00+j0.03
0.00+j0.025
0.00+j0.020
0.00+j0.020
0.00+j0.015
0.00+j0.010
0.00+j0.025
2. Form the Zbus for the given network connections (take bus 1 as reference).
Element
1
2
3
4
5
6
Self
Bus code
1-2
1-2
1-3
2-4
2-4
3-4
Impedance
0.6
0.4
0.5
0.2
0.4
0.5
Mutual
Bus code
[16]
Impedence
1-2 (1)
0.2
2-4 (4)
0.1
3. Classify the buses in a power system and explain the significance of slack bus.
[16]
4. Develop relevant expressions for Jacobin Matrix of N-R (polar form) also write algorithm for N-R (Polar form)
load flow.
[16]
5. (a) Justify the assumption that load currents and line charging currents are negligible in short circuit analysis.
(b) What is short circuit capacity and derive an expression for SCcapacity?
[10+6]
6. (a) Pabc is 3 phase power in a circuit and P012 is power in the same circuit in terms of symmetrical components.
Show that abc = 012 .
(b) The line currents in a 3 phase supply to an un balanced load are respectively
Ia = 10 + j20; Ib = 12 - j10; Ic = -3 - j5 Amp. phase sequence is abc. Determine the sequence components
of currents.
[8+8]
7. (a) A generator supplies power to an infinite bus over a line with generalised circuit constants of A, B, C & D.
Derive an expression for steady state stability limit.
(b) Define “synchronizing power coefficient”.
[16]
8. (a) What are the assumptions made in deriving swing equation.
(b) Explain point by point method of determine swing curve.
?????
[6+10]
2
Code No: R5410203
IV B.Tech I Semester(R05) Regular/Supplementary Examinations, December 2009
POWER SYSTEM ANALYSIS
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
?????
1. Form Zloop for the network by singular transformation:
Element
E-A
E-B
A-B
B-C
A-D
C-F
D-F
[16]
Positive sequence reactance
0.04
0.05
0.04
0.03
0.02
0.07
0.10
2. Form the Zbus for the given network connections (take bus 1 as reference):
Element
1
2
3
4
5
Self
Bus code
1-2
1-5
2-3
3-4
4-5
Impedance
0.4
0.5
0.5
0.3
0.5
Mutual
Bus code
[16]
Impedence
2-3
3-4
0.15
0.1
3. (a) Explain why voltage vector for a power system is called “state vector” in load flow analysis. Explain its
significance.
(b) Explain handling of Q limits in voltage controlled Buses.
[16]
4. Explain how P-V bus is handled in N-R (Rectangular form) method.
[16]
5. (a) Derive an expression for Base impedance, given Base KVLL and Base MVA3−φ
(b) P.u impedance of a 3 phase transformer referred to LV is xT . Find pu impedance referred to HV side.
(c) P.u impedance of an element is Zpu on a given Base KVLL and Base MVA3−φ . What is its pu impedance
on Base KVLL (new) and Base MVA3−φ (new).
[4+6+6]
6. (a) The voltages across a 3 phase unbalanced load are Vab = 300 V6 0; Vbc = 300
respectively. Determine the sequence components of voltages.
6
-900 ; Vca = 800
6
1430
(b) Symmetrical components of unbalanced 3 phase currents are I0 = 3 6 -300 ; I1 = 5 6 900 ; and I2 = 4 6 300 .
Obtain original unbalanced phasors.
[8+8]
7. A salient pole synchronous generator is connected to an infinite bus via a line. Derive an expression for electrical
power output of the generator and draw p-δ curve.
[16]
8. A 50 Hz, 500 MVA, 400 KV generator (including transformer) is connected to a 400 KV infinite bus bar through
on inter connector. The generator has H = 2.5 MJ/MVA. Voltage behind transient reactance 420 KV and
supplies 460 MW. The transfer reactance between generator and bus bar under various conditions are
Prefault = 0.5 pu; During fault = 1.0 pu; Post fault = 0.75 pu.
Calculate swing curve using ∆T = 0.05 sec, with fault cleared at 0.1 secs. The period of study is 0.2 secs. [16]
?????
3
Code No: R5410203
IV B.Tech I Semester(R05) Regular/Supplementary Examinations, December 2009
POWER SYSTEM ANALYSIS
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
?????
1. (a) What is a graph? Explain the need of graph theory.
(b) Define the terms basic incidence matrix and basic cutset matrix.
[8+8]
2. Form the Zbus for the given network connections:
Self
Bus code (element)
1-2 (1)
1-3
3-4
1-2 (2)
2-4
Impedence
0.6
0.5
0.5
0.4
0.2
Mutual
Bus code
[16]
Impedence
1-2 (1)
0.1
1-2 (1)
0.2
3. (a) Explain why voltage vector for a power system is called “state vector” in load flow analysis. Explain its
significance.
(b) Explain handling of Q limits in voltage controlled Buses.
[16]
4. Explain step by step algorithm of N-R (Rectangular form) including P-V Busses.
[16]
5. (a) Derive an expression for Base impedance, given Base KVLL and Base MVA3−φ
(b) P.u impedance of a 3 phase transformer referred to LV is xT . Find pu impedance referred to HV side.
(c) P.u impedance of an element is Zpu on a given Base KVLL and Base MVA3−φ . What is its pu impedance
on Base KVLL (new) and Base MVA3−φ (new).
[4+6+6]
6. (a) The voltages across a 3 phase unbalanced load are Vab = 300 V6 0; Vbc = 300
respectively. Determine the sequence components of voltages.
6
-900 ; Vca = 800
6
1430
(b) Symmetrical components of unbalanced 3 phase currents are I0 = 3 6 -300 ; I1 = 5 6 900 ; and I2 = 4 6 300 .
Obtain original unbalanced phasors.
[8+8]
7. (a) Define “synchronising power coefficient”.
(b) Derive swing equation of a single machine connected to infinite bus and prove that synchronising power
coefficient has to be positive for system to be steady state stable.
[16]
8. (a) State the assumptions made in deriving swing equation of single machine connected to infinite bus.
(b) A 50 Hz generator is delivering 50 % of the power that is capable of delivering through transmission system
to an infinite bus. A fault occurs that increases the reactance between generator and infinite bus to 500 %
of the value before the fault. When fault is isolated the maximum power that can be delivered is 75 % of
the original maximum value. Determine critical clearing angle.
[6+10]
?????
4
Code No: R5410203
IV B.Tech I Semester(R05) Regular/Supplementary Examinations, December 2009
POWER SYSTEM ANALYSIS
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
?????
1. Prove Zloop = C’[z]C using singular transformation.
[16]
2. Form the Zbus for the given network connections and remove the element-2, form the Zbus using removal of
element formulae.
[16]
Element
1
2
3
4
Self
Bus code (element)
1-2
1-3
1-3
2-3
Impedance
0.3
0.4
0.4
0.2
Mutual
Bus code (element)
Impedence
1-3 (2)
1-3 (3)
0.1
0.05
3. Derive the basic equations for load flow studies and also write the assumptions and approximations to get the
simple equations.
[16]
4. (a) What are the advantages and limitations of FDLF method compared to NR (Polar form) method?
(b) What is a sparse matrix? Comment on admittance matrix and Jacobin matrix of a load flow study. [8+8]
5. (a) Derive an expression for Base impedance, given Base KVLL and Base MVA3−φ
(b) P.u impedance of a 3 phase transformer referred to LV is xT . Find pu impedance referred to HV side.
(c) P.u impedance of an element is Zpu on a given Base KVLL and Base MVA3−φ . What is its pu impedance
on Base KVLL (new) and Base MVA3−φ (new).
[4+6+6]
6. (a) Explain how a L - G fault on a unloaded generator is analysed. Also explain how sequence networks are to
be connected for a LG fault.
(b) A synchronous generator 50 MVA, 13.8 KV has subtransient reactance, negative sequence reactance and
zero sequence reactance equal to j0.1, j0.1 and j0.08 respectively. If a LLG fault occurs at the terminals of
the generator (neutral solidly grounded) find fault current.
[8+8]
7. A 3 phase 50 Hz transmission line is 200 Km long. The line parameters are r = 0.1 ohm /Km; x = 0.25 ohm/km;
y = 3 × 10−6 mho / Km. The line is represented by nominal π model. If |VS | = |VR | = 200KV determine
steady state stability limit.
[16]
8. A 50 Hz, 500 MVA, 400 KV generator (including transformer) is connected to a 400 KV infinite bus bar through
on inter connector. The generator has H = 2.5 MJ/MVA. Voltage behind transient reactance 420 KV and
supplies 460 MW. The transfer reactance between generator and bus bar under various conditions are
Prefault = 0.5 pu; During fault = 1.0 pu; Post fault = 0.75 pu.
Calculate swing curve using ∆T = 0.05 sec, with fault cleared at 0.1 secs. The period of study is 0.2 secs. [16]
?????
1
Code: 9A04602
B.Tech III Year I Semester (R09) Regular & Supplementary Examinations December/January 2013/14
MICROPROCESSORS & MICROCONTROLLERS
(Common to CSS, IT and ECC)
Time: 3 hours
Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1 (a)
(b)
Write an ALP in 8086 to subtract two 8-bit numbers.
What are pointers and index registers?
2 (a)
(b)
Write an ALP in 8086 to find the GCD of two 8 bit numbers.
Write an ALP in 8086 to subtract two 16 bit decimal numbers.
3
Explain the differences between minimum and maximum modes of 8086. How are these
modes selected?
4
Explain D/A and A/D converter interfacing with 8086.
5 (a)
(b)
Explain RS-232C to TTL interfacing.
Give a sample program for serial data transfer.
6
Draw the block diagram of 8253 and explain about each block in detail.
7 (a)
Write the analog to digital conversion program in 8051 microcontroller to convert analog
data into digital. Digitalize the input for every 100 μs and store the 1000 values in external
RAM location 4000b to 43E7h.
Explain the JUMP instructions present in 8051 microcontroller with a mnemonic code and
its operation for each.
(b)
8 (a)
(b)
Explain the addressing modes of MCS-96.
Clearly explain the instruction set of MCS-96.
*****
2
Code: 9A04602
B.Tech III Year I Semester (R09) Regular & Supplementary Examinations December/January 2013/14
MICROPROCESSORS & MICROCONTROLLERS
(Common to CSS, IT and ECC)
Time: 3 hours
Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1 (a)
(b)
Draw a block diagram of 8086 microprocessor and explain about its working.
What are the important features of 8086?
2 (a)
(b)
Write an ALP in 8086 to find the smallest of a set of 8 bit numbers.
Write an ALP in 8086 to add two 8 bit ASCII numbers.
3 (a)
(b)
What is the operation of S0, S1 & S2 pins of maximum mode?
What is the use of DEN pin in minimum mode and LOCK in maximum mode?
4
Explain the functional diagram of 8279 keyboard and display controller.
5
Explain block diagram IC 8251. Explain the logic of 8251 program.
6
What is the purpose of initialization and operational command words of 8259? Explain
their format and the use.
7 (a)
(b)
Write program to load accumulator, DPH and DPL using 8051.
What is subroutine or procedure?
8 (a)
(b)
Explain the instruction set of MCS-96 microcontrollers with simple example.
List example applications of ARM cores.
*****
3
Code: 9A04602
B.Tech III Year I Semester (R09) Regular & Supplementary Examinations December/January 2013/14
MICROPROCESSORS & MICROCONTROLLERS
(Common to CSS, IT and ECC)
Time: 3 hours
Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1
Explain the function of memory storing and retrieving of 16 bit at an odd and even
addressed bank with necessary diagram for 8086.
2
Write an ALP in 8086 to arrange a set of 8 bit numbers into ascending order.
3
Draw the block diagram of 8257 DMA controller and explain its operations.
4 (a)
(b)
Explain 7 segment LED interface with microprocessor.
Explain 8255 PPI and modes of operation in detail.
5 (a)
(b)
Explain the advantages of using the USART chips in microprocessor based systems.
Discuss how 8251 is used for serial communication of data.
6
With a neat diagram explain the interfacing of 8259 with 8086.
7 (a)
(b)
(c)
Explain the functions of the pin PSEN of 8051.
Name the special functions register SP of 8051.
How the program memory is organized in 8051 based system?
8 (a)
(b)
Give a short note on evolution of ARM.
Explain about the MCS-96 family.
*****
4
Code: 9A04602
B.Tech III Year I Semester (R09) Regular & Supplementary Examinations December/January 2013/14
MICROPROCESSORS & MICROCONTROLLERS
(Common to CSS, IT and ECC)
Time: 3 hours
Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1
Explain in detail about the following units in 8086 microprocessor:
(i) Bus interface unit (BIU). (ii) Execution unit (EU).
2 (a)
(b)
Write an ALP to count the number of 1’s and 0’s in a given 16-bit binary string.
Write an ALP in 8086 to convert an 8-bit BCD into 8-bit hexadecimal number.
3 (a)
(b)
Explain in detail the pin diagram of 8086.
Discuss about timing diagram of 8086.
4 (a)
(b)
Explain about vector interrupt table.
Discuss about interrupt service routine.
5
Explain briefly the conversion of TTL to RS 232C and vice versa.
6 (a)
(b)
Bring out the features of 8259.
Explain the advantages of PIC chips in microprocessor based systems.
7 (a)
Add the unsigned number found in 8051 microcontroller internal RAM locations 25h,
26h and 27h together and put the result in RAM locations 30h (MSB) and 31h (LSB).
List out the arithmetic operations of 8051 microcontroller with an example and show
how the flags are affected for each operation.
(b)
8
Discuss about pin diagram and architecture of MCS-96 microcontrollers.
*****
R09
Code: 9A02603
B.Tech III Year II Semester (R09) Supplementary Examinations January/February 2014
POWER SYSTEM OPERATION AND CONTROL
(Electrical and Electronics Engineering)
Time: 3 hours
Max Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1
Explain how the incremental production cost of a thermal power station can be determined.
2
A power system is supplied by only two plants, both of which operate on economical
dispatch. At the bus of plant-1, the incremental cost is 55 Rs/MWh and at plant-2 is 50
Rs/MWh. Which plant has the higher penalty factor? What is the penalty factor of plant-1 if
the cost per hour of increasing the load on system by 1 MW is 75 Rs/hr.
3
Explain the solution method of long-term hydro thermal scheduling by discretization
principle.
4
What is the need of reheat type steam turbines for the modern large power systems?
Explain with a neat sketch.
5 (a)
(b)
Explain the steady state response of a power system for uncontrolled case of LFC.
Explain the frequency droop characteristics for free governor operation at different speed
changer settings.
6 (a)
(b)
What is area frequency response characteristic?
Explain it in the context of two area system.
7 (a)
What is the need of dynamic reactive power compensation in interconnected power
systems?
List out different reactive power sinks in power system and briefly explain.
(b)
8
Explain about different entities in deregulated electricity market.
*****
R09
Code: 9A10504
B.Tech III Year II Semester (R09) Supplementary Examinations January/February 2014
LINEAR & DIGITAL I.C APPLICATIONS
(Common to EEE & MCT)
Time: 3 hours
Max. Marks: 70
Answer any FIVE questions
All questions carry equal marks
*****
1
(a) Define the following parameters:
(i) CMRR.
(ii) PSRR.
(iii) Input offset current.
(b) Briefly explain the necessity and function of different stages of op-amp with respect to its
block schematic.
2
(a) Design a differentiator to differentiate an input signal that varies in frequency from 10 Hz to
about 1 KHz.
(b) Explain the operation three op-amp differential amplifiers with neat diagram, and mention
one of its applications.
3
(a) In the square wave generator using 555 timer RA = 2.2 KΩ, RB = 3.9 KΩ and C = 0.1 F.
Determine the positive pulse width tc, negative pulse width td and free-running frequency fo.
(b) Explain any two applications of IC 565.
4
(a) Draw and explain the operation of CMOS OAI gate.
(b) Explain resistive model of a CMOS inverter with a resistive load.
5
(a) Define the following terms:
(i) Fan-in.
(ii) Fan out.
(iii) Propagation delay.
(iv) Power consumption.
(v) Noise margin.
(b) Compare CMOS, TTL and ECL logic families by taking the parameters in question 5 (a).
6
(a) Define simulation and synthesis.
(b) Write architecture syntax for:
(i) Data flow model.
(ii) Structural model.
7
(a) Write a VHDL code for 74X138.
(b) Design 32X1 multiplexer using 74X151’s and 74X138.
8
(a) Explain how a JKFF is converted in to SRFF.
(b) Draw and explain parallel-in parallel out shift register.
*****

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