Thursday, November 22, 2012


Anna University, Chennai Nov/Dec 2012 Examinations Important Questions
These Questions May or May Not Be asked
Unit I-V
1.     With the help of a neat sketch explain the working of Whitworth quick return mechanism
2.     With the help of a neat sketch explain the working of Single slider and double slider crank chain mechanism
3.     Explain any two inversion of four bar chain
4.     With the help of a neat sketch explain the working of O ldham’s coupling.
5.     In a four link mechanism, the dimensions of the links are AB=200 mm, BC=400mm, CD=450 mm and AD=600mm. At the instant when DAB=90°, the link AB has angular velocity of 36 rad/s in the clockwise direction. Determine (i) The velocity of point C, (ii) The velocity of point E on the link BC When BE =200 mm (iii) the angular velocities of links BC and CD, iv) acceleration of link of link BC
6.     PQRS is a four bar chain with fixed link PS. The length of the links are : PQ = 62.5 mm, QR = 175 mm, RS = 112.5 mm and PS = 200 mm. The crank PQ rotates at 10 rad/s clockwise. Draw the velocity diagram and acceleration diagram when angle QPS = 600 and find the angular velocity and angular acceleration of the links QR and RS
7.      Derive the expression for Coriolis component of acceleration with neat sketch
8.     In a steam engine mechanism shown in figure a) the crank AB rotates at 200 rpm. The dimensions of various links are AB = 12cm, BC = 48cm, CD = 18cm and DE =36cm, EF = 12 cm and FP = 36cm. Find the velocities of C,D,E,F and P.
9.     A tangent cam to drive a roller follower through a total lift of 12.5 mm for a cam rotation of 75°. The cam speed is 600 rpm . The distance between cam centre and follower centre at full lift is 45 mm and the roller is 20 mm in diameter. Find the cam proportions and plot displacement, velocity and acceleration for one full cycle
10.Draw the profile of a cam operating a roller reciprocating follower and with the following data: Minimum radius of cam =25 mm; lift=30mm; Roller diameter= 15mm. The cam lifts the follower for 120° with SHM, followed by a dwell period of 30°. Then the follower lowers down during 150° of cam rotation with uniform acceleration and retardation followed by a dwell period. If the cam rotates at a uniform speed of 150 RPM. Calculate the maximum velocity and acceleration of follower during the descent period
11. Draw the profile of a cam operating a Knife-edged follower from the following data: (a) Follower to move outward through 40 mm during 60° of a cam rotation; (b) Follower to dwell for the next 45° (c) Follower to return its original position during next 90° (d)Follower to dwell for the rest of cam rotation. The displacement of the follower is to take place with simple harmonic motion during both the outward and return strokes. The least radius of the cam is 50mm. If the cam rotates at 300 r.p.m., determine the maximum velocity and acceleration of the follower during the outward stroke and return stroke
12.Briefly explain the undercutting in cam mechanisms.
13. The sun planet gear of an epicyclic gear train, the annular D has 100 internal teeth, the sun gear A has 50 external teeth and planet gear B has 25 external teeth. The gear B meshes with gear D and gear A. The gear B is carried on arm E, which rotates about the centre of annular gear D. If the gear D is fixed and arm rotates at 20 rpm, then find the speeds of gear A and B.
14.The arm of an epicyclic gear train rotates at 100 rpm in the anticlock wise direction. The arm carries two wheels A and B having 36 and 45 teeth respectively. The wheel A is fixed and the arm rotates about the centre of wheel A. Find the speed of wheel B. What will be the speed of B, if the wheel A instead of being fixed, makes 200 rpm (clockwise).
15. An open belt drive is used to connect two parallel shafts 4 m apart. The diameter of the bigger pulley is 1.5 m and that of the smaller pulley is 0.5 m. The mass of the belt is 1 kg/m length. The maximum tension is not to exceed 1500 N. The coefficient of friction is 0.25. The bigger pulley which is the driver runs at 250 rpm. Due to the slip, the speed of the driven is 725 rpm. Calculate the power transmitted and power lost in friction
16.An open belt running over two pulley of 1.5 m and 1.0 m diameters connects two parallel shafts 4.8 m apart. The initial ten in the belt is 3000 N. The smaller pulley is rotating at 600 rpm. The mass of belt is 0.6703 kg/m length. The coefficient of friction between the belt and pulleys is 0.3. Find (1) the exact length of the belt required (2) the power transmitted taking c.f tension into account
17. A vertical shaft 140 mm in diameter rotating at 120 rpm rests on a flat end footstep bearing. The shaft carries a vertical load of 30 KN. The coeffiecient of friction is 0.06. Estimate the power lost in friction assuming (1) Uniform Pressure and (2) Uniform wear
18.Two shaft whose centers are 1m apart are connected by a V belt drive. The driving pulley is supplied with 100 KW and has an effective diameter of 300 mm. It runs at 375 rpm. The angle of groove on the pulley is 400 The permissible tension in 400 mm2 cross sectional area of the belt is 2.1 MPa. The density of the belt is 1100 kg/ mm3 coefficient of friction is 0.28. Estimate number of belts required
19.Single plate clutch, effective on both sides is required to transmit 25KW at 3000 rpm. Determine the outer and inner radius of frictional surface if the coefficient of friction is 0.2555. The ratio of radius is 1.25 and the maximum pressure is not to exceed of 0.1 N/mm2. Also determine the axial thrust to be provided by springs. Assume uniform wear.
20.           The mean diameter of the screw jack having pitch of 10 mm is 50 mm. A load of 20 KN is lifted through a distance of 170 mm. Find the work done in lifting the load and efficiency of the screw jack when (i) the load rotates with the screw, and (ii) the load rests on the loose head which does not rotate with screw. The external and internal diameter of the bearing surface of the loose head is 60 mm and 10mm respectively. The coefficient of friction for the screw as well as the bearing surface may be taken as 0.08

Important Questions in EC2201 Electrical Engineering Anna Univ,Chennai

Anna University, Chennai Nov/Dec 2012 Examinations Important Questions
EC2201/ Electrical Engineering
Unit I-V
1.     Explain the construction and working of three point starter?
2.     Explain in detail about swimburne’s test?
3.     Describe with a neat diagram the constructional features of DC machines
4.     When running on no- load, a 400 V shunt motor takes 5 A. Armature resistance is 0.5 Ω and field resistance 200 Ω. Find the output of the motor and efficiency when running on full – load and taking a current of 50 A. Also find the % change in speed from no – load to full – load
5.     Explain Torque speed characteristics of d.c shunt and d.c series motor with relevant derivations to justify their shape
6.     Explain the principle of operation of a single phase transformer
7.      A 5 KVA, 400/200 V 50Hz, single phase transformer gave the following readings.
                                    OC: 400V, 1A, 50W (LV side opened)
                                    SC: 12V, 10A, 40W (LV shorted)
Determine (i) Efficiency on full load 0.8 lagging power factor, (ii) regulation at 0.8 p.f lagging, (iii) Efficiency on 60% of full load 0.8 leading power factor ,(iv) Draw the equivalent circuit referred to primary and insert all the values
8.     Discuss in detail with neat diagrams the constructional details of a transformer.
9.     Determine the regulation of a transformer for resistive, inductive and capacitive loaded conditions
10.Derive the condition for maximum torque and also the expression for maximum torque
11. While delivering a useful power of 24 kW to the full load, a 3Ф, 50Hz, 8 Pole induction motor draws a line current of 57 A. It runs at a speed of 720 rpm and is connected to 415 supply. The p.f of the motor is 0.707 lagging. Stator resistance per phase is 0.1 Ω. The mechanical losses are 1000W.Calculate (i) Shaft torque(ii) Gross torque (iii) rotor copper loss (iv) stator iron loss (v) stator copper loss (vi) overall efficiency(vii) draw the power flow diagram
12.What are the methods of speed control in 3Ф induction motor? Explain them in detail     
13. Explain the torque slip characteristics of 3Ф induction motor in detail
14.Explain in detail the MMF method of obtaining regulation of an alternator
15. Write detailed notes on (i) reluctance motor (ii) stepper motor
16.Explain the construction of two types of synchronous generator
17. Explain the construction and operation of hysteresis motor
18.Describe the types of DC links
19.Discuss about the types of cables used in power systems
20.                        Draw the schematic diagram of a electric power system. Briefly explain the structure
21.Explain in detail (i)  Pin type insulator (ii) Pole mounted substation

Important Questions In GE2021 Environmental Science & Engineering for Nov/Dec 2012 Anna University Examination

Anna University, Chennai Nov/Dec 2012 Examinations Important Questions
GE2021 Environmental Science & Engineering
Unit I-V
1.     How is biodiversity conserved? Explain in situ and ex situ conservation along with their merits and limitations
2.     Explain ecosystem, energy flow in ecosystem, food chain, food webs and ecological pyramids.
             3.     Describe the types, characteristic features, structure and functions of i)                    Forest Ecosystem, ii)    Aquatic Ecosystem
4.     Discuss the possible solutions to improve the acceptability of dam projects in Indian conditions
5.     Explain solid waste management
6.     Explain Bhopal gas tragedy and Chernobyl nuclear disaster
7.      What do you mean by thermal pollution? Discuss the causes, effects and control measures of thermal pollution
8.     Explain the causes, effects and control measure of water and air pollution
9.     What are the major causes of deforestation? Discuss its consequences
10.Discuss in detail the causes and consequences of overexploitation of forest resources
11. Give a brief account of renewable energy resources and their significance
12.With a neat sketch explain the flow of energy through the various components of the ecosystem.
13. What is sustainable development? Explain the measures for it
           14.Explain the following (i) Wild life Protective Act (ii) Forest preventative Act. (iii) Environmental Protection act (iv) Water act
15. Discuss the causes and effects of the following(i) Global warming (ii) Acid rain (iii) Ozone layer depletion
          16.Explain the mechanism of formation of acid rain. Discuss the phenomenon of global warming and factors contributing to it
           17. Write notes on the following (i) women and child welfare. (ii) Human rights (iii) value education
           18.Explain the role of IT in environment and human health
19.Discuss about the environmental and social problem faced by a large Indian city like Chennai
20. Describe briefly (i) The factors that affect human population growth rate.ii) Human rights. iii) Value Education

Important Questions In EE2301 Power Electronics For Anna University Nov/Dec 2012 Examinations

Anna University, Chennai Nov/Dec 2012 Examinations Important Questions
EE2301 - Power Electronics
Unit I-V
1.     Explain the operation of the SCR with diagram. Explain its characteristics
2.     Give short notes on (i) snubber circuit for BJT and (ii) commutation circuit for SCR
3.      Discuss the transfer, output and switching characteristics of MOSFET
4.     Explain the switching characteristics of IGBT with neat circuit diagram and waveforms
5.     Explain the working principle of a single phase full wave controlled converter with RL load with diagrams
6.     Explain the operation of buck-boost regulator with different modes of operation and derive the design value of capacitor and inductor
7.      Explain the principle of operation of dual converter with neat power circuit diagram
8.     A single phase semi-converter is operated from a 120V, 50Hz ac supply. The load current with an average value of IDC is continuous and ripple free. Firing angle is given by a=p/6. Determine (i) Displacement factor (ii) Harmonic factor of input current (iii) Input power factor
9.     Explain the operation of boost and buck-boost converter with neat circuit diagram and waveforms
10.Explain the various modes of operation of boost converter with neat circuit diagram and waveforms.
11. Discuss the function of three phase voltage source inverter supplying a balanced star connected load in 180 degree mode of operation
12.Draw the circuit of boost regulator and explain its working principle with necessary waveforms.
13. Describe the working of a single phase full bridge inverter with relevant circuit and waveforms
14.What is PWM? List the various PWM techniques and explain
15. Explain the operation SMPS with circuit diagram
16.Describe the principle of 1 phase to 1 phase step down cyclo-converter with neat sketches and waveforms
17. Explain two stage sequence control of  AC voltage controller with R load
18.Explain the operation of multi-stage sequence control of AC voltage controllers
19.Describe the 3 phase to 3 phase cyclo-converters using 18 thyristors. Also derive the expression for fundamental RMS value of per phase output voltage for a low frequency m-pulse cyclo-converter
20.                        Explain the operation of single phase full wave AC voltage regulator with circuit diagrams and waveforms

Changes In Anna Univ Nov/Dec 2012 UG/PG Exam Timetable

Anna University :: Chennai 600 025 
Office of the Controller of Examinations November/December 2012 Examinations 
Anna University :: Chennai 600 025 
Office of the Controller of Examinations November/December 2012 Examinations