Nts Fesco Test 21-06-15

1. If all conductive objects are bounded to the same earth grounding system the risk of electric shock is A. Maximum B. Minimum C. Zero Answer: B 2.  ____ is the small voltage (less than 10V) that can be measured between two possible constant points A. Dim voltage B. Tame voltage C. Stray voltage D. Ground voltage Answer: C 3. An LTI system can be completely characterized c haracterized by its: A. Step response

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B. Ramp response C. Impulse response D. Output Answer: C The principle of _____ can be used to analyze fault in power system/network A. Norton B. Thevenin C. Superposition D. Jordan Answer: C Any constant of time domain is an impulse in frequency domain with A. Infinite height, infinite width, infinite area B. Infinite height, zero width, infinite area C. Infinite height, unit width, infinite area D. Infinite height, Zero width, unit area Answer: D Optical power depends on _____ associated with the optical fiber receiver A. Quantum B. Dark Current C. Thermal Current D. All of the above Answer: D  _____ is maximum when RLC circuit is in resonance resonance A. Power dissipation B. Inductive current C. Capacitive voltage D. None of the above Answer: A In Z transform the region of convergence must be centered at Poles

A. Poles B. Zeros C. Origin D. Z =1 Answer: C 9. Which of the following converts thermal energy to kinetic energy ? A. Thermocouple B. Storage battery C. Fuel cell D. Rocket Answer: D 10. The shunt winding of a motor has a resistance o f 85 ohm at 22oC. When the motor runs at full load, its resistance increases to 100 ohms. The resistance temperature coefficient of winding per 0oC is 0.004. The rise in tem perature of the winding will be nearly A. 20oC B. 50oC C. 70oC D. 100oC Answer: C 11. A 100 volt bulb has a resistance of 500 ohms. The number of hours it can wor k for every kwh of energy consumed will be A. 20 B. 40 C. 50 D. 60 Answer: C 12. A _____ meter is used a null detector in wheatstone bridge A. Ammeter B. Voltmeter C. Galvanometer Answer: C 13. A moving iron ammeter coil has few t urns of thick wire so that A. Resistance is less B. Sensitivity is high C. Damping is effective D. Scale is large Answer: A 14. For measuring small resistance we use A. Kelvin bridge B. Wheatstone Bridge C. Maxwell Bridge Answer: A 15. Hay bridge is used for the measurement of A. Inductance

B. Resistance C. Capacitance Answer: A 16.  ____ bridge is used for the measurement of resistance A. Wheatstone bridge B. Maxwell Bridge C. Schering Bridge D. Hay Bridge Answer: A 17. If x[n]= cos pi/4 is the period is equal to A. 2 B. 4 C. 8 D. 10 Answer: C 18.  ____ is defined as the measure of instrument by which it is error free A. Accuracy B. Precision C. Resolution Answer: A 19. If R1 is the resistance of a coil of copper at t oC and RT is the resistance at T oC and also the resistance temperature coefficient of copper per degree centrigrade at 0oC is 1/234.45, then Rt/RT A. (1+t) / (1+T) B. (1+ 234.45t) / (1+234.45 T) C. (234.45 + t) / (234.45 + T) D. (234.45 + t2 ) / (234.45 + T 2) Answer: C 20. A permanent magnet coil meter has which features A. Low power consumption B. no hysteresis loss C. reduced eddy current D. reduced damping E. all Answer: E 21. By which a meter after checking with no current returns to its previous state A. Controlling Torque B. Damping Torque Answer: A 22. When the shunt resistance of a galvanometer circuit increased, its A. Current sensitivity increases B. Current sensitivity decreases C. Damping increases

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D. Controlling torque decreases Answer: B Fourier series representation of continuous signal requires _______ no of harmonically complex exponentials A. N B. n+N C. 1 D. infinite Answer: E For LTI system if all poles and zer os are inside unit circle then A. Its inverse does not exist B. It is stable and causal system C. Its inverse is stable and causal D. Both system and its inverse are stable and causal The EM field and current are concentrated close to the surface of the conductor. The phenomenon is called? A. Faraday Effect B. Skin Effect C. EM concentration Effect D. Ohm’s Effect Answer: B The wavelength of an EM wave after reflection at an angle on a surface A. Increases in the actual direction of propagation B. decreases in the actual direction of propagation C. remains the same as the wavelength per pendicular to the surface D. remains the same as in free space Answer: A ΔxH=J+D A. Continuity Equation B. Maxwell equation C. Poisson Equation D. Laplacian Equation Answer: B Light is produced in electric discharge lamps by A. Heating effect of current B. Magnetic effect of current C. Ionization in a gas or vapor D. Carbon electrodes Answer: C Z transform is used when signal is not A. Absolute Summable B. Square summable C. Converges D. Diverges E. Option A,B & C

Answer: E 30. Which statement is true about continuous and discrete LTI system A. Convolution sum is an approximation to convolution integral B. Convolution integral is an approximation to convolution sum C. Convolution sum and integral are explicit function Answer: C 31. A relay used for protection of moto rs against overload is A. Impedance relay B. Electromagnetic attraction type C. Thermal relay D. Buchholz's relay Answer: C 32.  _____ is used for detection of fault and initiate trip in power system A. Protective Relays Answer: A 33. If ROC (Region of convergence) does not include unit circle then A. Fourier transform converges B. Z Transform converges C. Hartley transform converges D. Chirplet transform converges Answer: B 34. Buchholz’s relay is used in A. Motor Protection B. Line Protection C. Generator Protection D. Transformer Protection Answer: D 35. Solid grounding is used for voltages A. above 220 kV B. above 11 kV C. below 660 V D. below 115 V Answer: C 36. In which of the following power plant the availability of power is least reliable ? A. Solar power plant B. Wind energy C. Tidal power plant D. Geothermal power plant E. Biogass plant Answer: B 37. For alternator, Armature reaction at unity power factor will be A. Magnetizing B. Demagnetizing C. Cross magnetizing Answer: C

38. Batteries used for electrical energy storage are Answer: Lead Acid Batteries 39. Which engine has the highest air fuel r atio A. Petrol engine B. Gas engine C. Diesel engine D. Gas turbine E. Hydro turbine Answer: D 40. Which instrument cannot be used for the dc measurement A. PMMC B. Moving Iron C. Induction type Answer: C 41. When electric field is parallel to plane o f incidence the EM wave is said to be A. Linearly polarized B. Circularly polarized C. Elliptically polarized D. Hyperbolically polarized Answer: D 42.  _____ is used for detection of fault and initiate trip in power system B. Protective Relays Answer: A 43. Natural uranium contains……………. Of U -235 A. Zero % B. 0.1 % C. 0.7% D. 0.5% Answer: C 44. ………….. is the reciprocal of power factor A. Inductive factor B. Reactive factor C. Gain factor D. Q-factor Answer: D 45. Power in inductive reactance of the circuit is called A. Active Power B. Reactive Power C. Apparent Power Answer: B 46.  _____ is multiplication of rms voltage and current A. Active Power B. Reactive Power C. Apparent Power D. Virtual Power Answer: C

47. Passive models include resistance, inductance and ______ Answer: Capacitance 48. RC snubber circuit is used to limit the rate of A. Rate of rise of current in SCR B. rate of rise of voltage across SCR C. conduction period D. All of the above Answer: B 49. Man first put step on Moon A. 1965 B. 1868 C. 1967 D. 1969 E. 1964 Answer: D 50. British named Allama Iqbal as A. Lord B. Sir C. Man of letter D. Knight Answer: B 51. Fundamentals of management applied in all organizations is called A. Principles of management B. Planning C. Planned Economy D. Policy Answer A 52. A team in every organization used to improve wo rk activities Answer: Problem solving team 53. Desert of bahawalpur is called as A. Cholistan B. Tharparkar C. Nara D. Thal Answer: A 54. The meaning of Saum is A. Observance of fasting B. Keep away from Answer: B 55. Hazrat Muhammad S.A.A.W was born on A. 570 B. 620

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C. 470 D. 571 Answer: D Cave Hira is situated near A. Makkah B. Madinah C. Taa’if  D. Jaddah E. Khyber Answer: A In MS Word the shortcut key for searching in a file A. Ctrl+X B. Alt+B C. Alt+X D. Ctrl+F E. Ctrl+V Answer: D One byte is Combination of 8 bits In the email dialog box Bcc: is used A. Writing the name B. Writing subject C. Writing email address D. Writing phone number Answer: C Pelshawa is sernior than Javeria. Samreen is senior than Maham, Rania is not senior that Javeria but is more senior than Samreen. W ho is the junior most A. Pelshawa B. Javeria C. Samreen D. Maham E. A& B Answer: D Complete the series 15,45,___,405 A. 90 B. 75 C. 135 D. 51 Answer: C Starting from end 8th letter in alphabets A. T B. S C. G D. K Answer: B

63. Freedom movement of Pakistan was based on the ideology of Islamic Ideology 64. Capital of Turkey Ankara 65. Largest Airport in Pakistan Quaide Azam Airport Karachi