SPECIAL TEST QUESTIONS FOR III YR AND II YR EEE STUDENTS

                           
                               SPECIAL TEST QUESTIONS FOR III YEAR EEE

Sub: Renewable energy sources (for sec-1) by M Suryakanth.

1. What are the advantages and disadvantages of biomass?
2. What is the difference between biogas and biomass?
3. What is biogas? How it is produced..
4. What are the different methods of obtaining energy from biomass? Explain.
5. Explain in detail about anaerobic digestion and the different phases and the processes
 involved in it.

Sub: Renewable energy sources (for sec-2) by Sravan Kumar
1. Explain the Classification of biogas plants
2. Explain the factors affecting Biodigestion or generation of BioGas
3. Explain the construction and working of a KVIC Digester
4. Explain the construction and working of a Chinese Digester
5. Discuss the present status of development of biomass energy resources in India
6. Write short notes on Biogas for IC Engines
7. Discuss the advantages and disadvantages of Floating Drum Plant and Fixed Dome
Plant

Sub: Electrical Measurement(for sec-2)
1. Explain the principle of operation and standardisation of potentiometer.
2. Draw the circuit diagram of DC Crompton’s potentiometer and explain its working.
3. Explain how true zero is obtained in Crompton’s potentiometer.
4. Write about Drysdale phase shifting transformer.
5. A single range potentiometer has a 18 steps dial switch where each step represents 0.1V ,
the dial resistors are 10 ohms. The slide wire of the potentiometer is circular and has 11
turns and a resistance of 11 ohms each. The slide wire has 100 division and interpolation can
be done to one fourth of a division. The working battery has a voltage of 6 volts and
negligible internal resistance.
Calculate a) The measuring range of potentiometer
b) The Resolution
c) Working current
d) setting rheostat

Sub: Electrical Measurement(for sec-1):

1)       Derive the expression for ratio and phase angle errors for current  transformer

2)      A 100/5 A, 50Hz current transformer has a bar primary and rated secondary burden of 12.5 VA. The secondary winding has 196 turns ad a leakage inductance of 0.96Mh with a purely resistive burden at rated full load ,the magnetizing mmf is 16A and loss excitation require 12A Find the ratio and phase angle errors

3)      Derive the expression for ratio and phase angle errors for P.T.

4)      Explain the construction of Weston type frequency meter                                                

5)      Explain the construction and working principle of three phase electrodynamometer

6)      Explain in detail about synchroscopes                                               

Sub: Power Semiconductor Drives
1) Discuss briefly the various methods of controlling the speed of the 3-phase induction motor from        stator side using solid state converters.
2) A 3 phase, 4 pole, 50hz induction motor has rotor resistance of  0.2Ώ and stand still reactance of         0.1Ώ. at full load it operates at slip of 4%. If the voltage is reduced to 50% at what speed will the
    motor operates with full load torque applied.
3) Derive the torque expression of 3 phase induction motor and draw the torque speed characteristics     of polyphase induction motor. also explain the following operating regions (1) motor region  (2)         generating region      (3) breaking region
4) For stator voltage control scheme of 3-phase induction motor  discuss about speed range,                     regeneration, harmonics, torque –pulsating, power factor, cost, efficiency and applications.
5) Explain merits and demerits of stator voltage control of induction
    motor.
6)  Explain about four quadrant ac voltage controller briefly.

Sub: CMPS

1.      Draw the flow chart for Gauss-seidal method when PV buses are included.

2.      The load flow data for the power system shown in fig is give in following tables.  

Bus code p-q	Impedance Zpq
1-2	0.08+j0.24
1-3	0.02+j0.06
2-3	0.06+j0.18

Bus code	Assumed bus voltages	Generation in MegaWatts	MVARs	MegaWatts Load	MVAR load
1	1.05+j0	0	0	0	0
2	1.0+j0	20	0	50	20
3	1.0+j0	0	0	60	25

The voltage magnitude at bus 2 is tobe maintained at 1.03 PU The max and min reactive power limits of generator at bus 2 are 35 and 0MVAR. With bus1 as slack bus obtain voltage at bus 3 using G-S method after 1 st iteration.(assuming base MVA=50).

sub: MPMC

1.  a)What is serial communication ? why it is important when the medium is telephone line.

     b) Explain the mainframe commutation using phone line.

2. a) Draw the b lock diagram of USART?  

     b)Explain the importance of 8251 in serial communication.

3. Explain the importance of RS-232 in serial communication with its pin diagram.

4. Elaborate GPIB ? Where do we use it ? Explain its operation with its pin diagram.

5. Explain the format of synchronous and asynchronous data transfer in serial communication with neat sketch?

SPECIAL TEST QUESTIONS FOR II YEAR EEE

Sub-ELECTRICAL MACHINES-II:

1.      Obtain the expression for the secondary currents of the two transformers operated in parallel with unequal voltage ratios.                                                                                                    

                                                                                            (May-2013)

2.      Describe the method by which the separation of the core losses of a transformer is achieved.                                                                                                

                                                                                 (Nov / Dec-2012)

3.      The following results were obtained from tests on 10 KVA; 500V/250 V single phase

 Transformer has following test results.

       O.C. test: 500 V, 1.2A, 80 W ,

       S.C. test: 50 V, 15 A, 90 W (LV side shorted)

Calculate regulation and the efficiency of the transformer at full load with 0.8 lagging power factor.                                                                                 (May-2013)   

(2 Marks)

1.      What are the conditions to satisfy to perform parallel operation on transformers?

2.      Why SC test is conducted on HV side of transformer?

Why OC test is conducted on LV side of transformer?

Sub-Power systems I:

Short answers: 1.      Define power factor? 2.      What are the different methods power factor improvements? 3.      What is synchronous condenser? Long answers: 4.      Explain low power factor and give the causes of low power factor of the supply system?             5.      Discuss the various methods for Power factor improvement. 6.      Derive an expression for the most economical value of power factor which may be attained by the Consumer Sub- STLD:        1) Explain briefly about the J-K & S-R Flip Flops. 2) Explain briefly about the T & D Flip Flops. 3) Convert J-K Flip Flop into S-R,D &T Flip Flops 4) Convert S-R Flip Flop into J-K,D &T Flip Flops 5) Convert D Flip Flop into S-R,J-K &T Flip Flops        Sub- Network Theory : SHORT QUESTIONS 1.Explain about the terminal pairs (or) ports of the network function ? 2.Determine the poles and zero’s of the impedance function   Z(s)= (s2+4s+3)/(s3+6s2+8s) & locate these on the plane ? 3.Explain the properties of transfer function ? LONG QUESTIONS 1.Find the network functions Z11(s)&Z21(s) for the network shown in fig.  2.Find current ratio transfer function  I2/I1 for the network shown in the fig. 3.For the given network function, draw pole-zero plot &hence obtain time domain. Response of voltage F(s)= 3s/(s3+4s2+6s+4)       II EEE  Section-1&2 ELECTRONIC CIRCUITS Short Questions 1.       Mention the application of one shot multivibrator. 2.       What are the two methods of triggering for Bistable multivibrator? Explain. 3.       What is a diode comparator? Explain its operation with the help of necessary circuit diagram and waveform. Long Questions 1.       What is a Monostable Multivibrator? Explian its operation with the help of waveform. 2.       Draw the Schmitt trigger circuits and explain with waveforms. 3.       What is clipper? With the help of the circuit diagram and waveform , describe the working of Positive & Negative clipper.