3rd Sem(2)

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  • B. Tech.lOdd2011-12/Reg

    Figures in the margin indicate marks for respective questions.

    (d) pH

    (e) buffer

    (b) What are the differences between saturated and unsaturatedfarty acids?

  • ( 2 )(c) What are the advantages of using triacylglycerolsas stored

    fonns of energy?

    (d) Write a short note on 'waxes'. 2+3+2+3

    4. (a) Define the following: amino acids, peptides and proteins,

    (b) Classify amino acids based on the properties of the sidechains. Give at least two examples in each case.

    (c) What are unconunon amino acids? Give an example.

    (d) Show how amino acids can act as both, acids and bases.2+5+1+2

    5. (a) Define primary, secondary, tertiary and quarternary structuresof protein.

    (b) Describe the salient features of p -sheet and p -turn.(c) Differentiate between fibrous and globular proteins. Give

    examples in each case. 3+5+2

    6. (a) Define the following: ground state, transition state, activationenergy and binding energy.

    (b) Derive Michaelis-Menten equation to show the relationshipbetween substrate concentration and rate of an enzyme-catalyzed reaction.

    4+67. (a) Differentiate between reversible and irreversible enzyme


    (b) What are regulatory enzymes.?

    (c) What is feed-back inhibition?

    (d) Diagrammatically show how phosphate groups can affect thestructure and catalytic activity of proteins highlighting a specific example.

    2+2+2+48. (a) Differentiate DNA and RNA.

    (b) What are the salient features of DNA double helix asdescribed by Watson and Crick?

    W/5/1480 (3)

    (c) What is Cot analysis? Explain Cot curve. 2+4+4

    9. (a) Give the working principle of Sanger's method of DNA-sequencing.

    (b) Name the reagents that are used in Sanger's and Edmandegradation methods of protein sequencing, respectively.

    (c) Show how disulphide bonds of proteins can be irreversiblybroken using appropriate reagents. 4+3+ 3

    10. (a) What is spectroscopy?

    (b) What is Beer-Lambert law?

    (c) Write a short note on anyone of the following :

    (I) X-my crystallography

    (n) Electron microscopy.

  • B. Tech.lOdd20 11-12/Reg.



    EE - 301

    The jigures in the margin iniIicdtefull markS.

    Answer any jive questions.

    1. (a) In the network shown in fig l(a), determine the values of Rand C so that maximum power is absorbed by R and also determinethe power. The signal frequency is ill= 200radlsec.

  • -SA ~



    (b) Draw the grap ofl a et~~r~ shown .in .fig 2(?) andfqrmulate the f-cut-setmatrix. rire uilibnum equation m matIix formin node basis.

  • (b) In the circuit shown in fig 3(b) the switch is on PQsition 'a~and the circuit becomes steady state condition. The switch is moved toposition 'b' at t = O. Find V (t).



    tV8F -L


    (c) In the network shown in fig 3(c) the switch is closed at t = 0and there is no initial charge on either of the capacitors. Find 11(t).


    4. (a) For the circuit in fig 4(a) fmd V for t> 0 if (i) Vg =4u(t)and (ii) the steady state value of V if Vg = 4 cos ot V and the output

    tenninals are loaded with resistor of 80.

  • h +

    '6. (a) Define stability of a ~stem. Explain the relationship betweenpo~ posHioQ,WId stability.

    (b) Find the transfer function (V2 / ~) of the network shown in,.tl!efig 6(b). Also sketch polezero configuration.


  • ( 8 )(c) Write the necessary conditions for transfer function. 6+6+2

    2s2 +57. (a) Determine the function, Z(s) = S(S2+ 1) is a JX>sitivereal or ELECTRICAL MEASUREMENTS AND MEASURING


    (b) Diagnose whether the impedance function,

    Z(s) = (s+4)(s+6(s+3)(s+5) represents a RL or RC network and find its first

    Cauer form.

    (c) Identify whether the impedance function,

    s(s2+4) . .Z( s) = 2 (S2+ 1)(S2+9) ~presents a LC, RL or RC network and realize

    it in both Foster form. 2+6+6

    8. (a) Defme m-derived filter. Derive all the characteristics ofconstant K low pass filter.

    (b) Find the component values of n-network constant K high-pass filter having cut-off frequency of 8 kHz and nominal characteristicimpedance of 6000. Hence, find its characteristic impedance and phaseconstant at f= 12 kHz and attenuation at f= 0.8kHz. 7+7

    Th figures in the margin indicate full marks.

    All parts of any question should be answered at one place.Use separate scripts fOf Group-A and Group-B.


    Question No.1 is compulsory and a1)swer any twofrom the rest.

    1. (i) A capacitor having a capacitance of 2.5 IlF is chargedto a potential difference of 450 volts. The capacitor is disconnectedfrom the supply and the reading on an electrostatic voltmeter inparallel with the capacitor is observed to fall to 280 volts in 15.2minutes. The test is repeated with a resistance R in parallel with thecapacitor and the voltmeter. The voltmeters reading are now foundto fall from 450 volts to 280 volts in 10.8 minutes. Calculate thevalue of R.

    (ii) In a test by Murray loop for ground fault on 1,000metres of cable having a resistance ofl.6 Oper km, the faulty cableis looped with a sound cable ofthe same length and cross-section.If the ratio of the other two arms of testing network at balance arein 3: 1, calculate the distance of the fault from the testing end ofthe cable.

    (iii) Write some advantages and disadvantages ofPMMCinstrument. 6+6+ 3= 15

  • 2. (i) Define: (a) Precision (b) Static Sensitivity.

    (ii) Explain with (l n at sketch, how a moving Ironinstrument works.

    (iii) Why secondary of current transformer should not beept open-circuited? 4+4+2=1 0

    (iii) In a gra ity contr lied instrument, the controllingweight is 0.005 kg and acts at a distance of2.4 cm from the axis ofthe moving sy tern. Determine the deflection in degreecorresponding to deflecting torque of 1.05x 10- 4kg-m.

    (1+1)+ 6+2=10

    5. Write short notes on any two from the following: 5x2=1 0

    (i) Eddy current damping

    (ii) Megger

    (iii) Fluid friction damping.

    3. (i) Differentiate between current transformer andpotential transformer.

    (ii) Define: (a) Ratio correction factor (b) Nominal ratio.

    (iii) A moving coil instrument gives a full scale deflectionfor a current of 20mA with a potentia} difference of200 mV acrossit. Calculate (a) Shunt required to use it as an ammeter to get arange of 0-200 A (b) Multiplier required to use it as voltmeter ofrange 0-500 Volts.


    Question No.6 is compulsory and attempt any threefrom the rest.

    (iv) The inductance of a moving iron ammeter is given bythe expression: L "- (12+5 e - 2 62) l-LH, where 6 is the angulardeflection in radian from zero position. Determine (a) The springconstant (b) The angular deflection in radians for a current oflOA if the deflection for a current of lOA is 30. 2+2+2+4= 10

    (a) Why thin wired heating element is preferred forthermocouple type voltmeters?

    (b) What is the main disadvantage for insulated hot junctionthermocouple type instruments?

    (c) What kind of diode is suitable for rectifier typevoltmeters?

    4. (i) Describe with the help of neat diagram, the loss ofcharge method to determine the insulation resistance of a shortlength of cable and derive an expression for determination ofinsulation resistance.

    (d) Why the moving system of a ballistic galvanometerhaving high inertia?

    (e) What is the source of frequency error in the case ofelectrodynamometer type instrument?

    (f) What type of voltmeter is preferred forthe measurementof DC voltage above 20kV?

    (ii) A fOUfterminal resistance of approximately 50 l-LQwas measured with the help of Kelvin double bridge under thefollowing condition:

    Value of standard resistance 100.03 l-LQ, resistance ofinner ratio arms 200.62 f,lQ and 400 n, resistance of outer ratioarms 200.48 f,lQ and 400 n, the resistance of link connecting thestandard to unknown resistance is 700 l-LQ. Calcu late the magnitudeof unknown resistance.

    7. (a) Compare thermocouple type instruments with rectifiertype instruments.

  • (b) An AC current, when measured by a rectifier typeammeter gives reading of31 A. but when same current is measuredby a thermocouple type ammeter gives 34.4 A. Whether the metersare correct? Justify your answer.

    (c) A moving coil type ammeter, a thermocouple typeammeter and a resistance of 100 Ohm is connected in series witha rectifier. Ifthe forward bias ~nd reverse bias resistance of therectifier is 100 Ohm and 500 Ohm respectively, then calculate thereading on the two ammeters. Consider the supply voltageof200 V. 3+3+4=10

    (c) Derive the expression for the deflecting torque of aDynamometer type moving coil instrument, also state how it canb used for the measurement of A current. 3+3+4= 10

    10. (a) At electrostatic oftmeter having full scale deflectionof90 deg. at 2500 V. The torsion constant for controlling spring is1 x 10-7 Nm/deg. and capacitance at 0 deg. is 12 pF. Determinecapacitance at full scale.

    8. (a) Derive the equation of motion of the vibrationgalvanometer.

    (b) A Crompton's potentiometer consists of a resistancedial having 15 steps of 10 Q each and a series connected slide wireof Ion which is divided into 100 divisions. If the working currentof the potentiometer is 10 mA and each division of slide wire canbe read accurately up to 15th of its span, calculate the resolutionof the potentiometer in volt.

    (c) The following readings were obtained duringmeasurement of inductance of a coil on an AC potentiometer:

    Voltage drop across 0.10 standard resistor connected in serieswith the coil = 0.613 L 2 6' V.

    Voltage across th