UPDA Electrical/Electronic Engineering Reviewer Material No. 04 PDF

UPDA Electrical/Electronic Engineering Reviewer Material No. 04 1. A series of fuel cells is connected to produce a no-load voltage of 230V at a rated voltage of 300V the cells provide 2.0 MW to a DC-AC converter. Assuming the cell van be modelled as a standard battery, what is the tota...

UPDA Electrical/Electronic Engineering Reviewer Material No. 04 1. A series of fuel cells is connected to produce a no-load voltage of 230V at a rated voltage of 300V the cells provide 2.0 MW to a DC-AC converter. Assuming the cell van be modelled as a standard battery, what is the total internal resistance of the fuel cells: Hint: P = V2RL, P = I2RL A. 0.0001 B. 0.003 C. 0.05 D. 3 2. In an embedded system, the dynamic response should be maximum: A. 10% B. 50% C. 80% D. 60% 3. The selected collector supply voltage is 12V. The transistor must be on for pulses of 150µA or greater only, what is the required value of the load resistance? A. 200Ω B. 300Ω C. 400Ω D. 600Ω 4. What is the maximum allowable size of the over-current device normally allowed to protect an AWG #12 THHW condu temperature of 550C? Only standard size over current device are available. A. 10A B. 15A C. 20A D. 30A 5. A single-phase transformer rated 100/7.2kV has an impedance of 10.0% during a factory short circuit test done at rated current the voltage the HV terminals will be most nearly: A. 0.72 B. 7.2 100*10percent =10 C. 10 D. 100 6. A radio station transmits 50kW with a directive gain of 105. What is the power density 10km from the radiating antenna? A. 0.060 mW/m2 Power Density = Power / area = 50000/ (10*1000*10*1000) = 0.0005 W/m2 B. 5.9 mW/m2 For gain 105 = 0.0005*105=50 W/m2 = 0.05mW/m2 C. 33 mW/m2 D. 75 mW/m2 Page 1 of 17 7. The SCADA system configuration uses input from an instrument CT with ratio of 100:5. the transducer supplying the SCADA has a full-scale AC current value of 2.5A. What is most nearly the maximum current in the primary side of the CT? Hint: [Ip/Is = hs/h)] A. 40 A B. 50 A C. 65 A 2.5 * (100/5) = 50A D. 70 A 8. What is HRC fuse? A. High resistance and capacitance B. High Rupturing Capacity 9. Which of the following describes the leakage flux? A. A flux outside the core B. Flux linking the primary C. Flux linking the secondary D. Flux other than the mutual flux 10. For forward biasing: A. Anode 3V cathode 7V B. Anode 5V cathode 3V C. Anode 7V cathode 10V 11. Which of the following parallel resistance will have the highest value of the equivalent resistance? A. 10 kOhm and 25kOhm B. 1 kOhm, 2 kOhm and 3 kOhm C. Two 500 kOhm resistors D. Four 40 kOhm and two 10kOhm resistors 12. In the 3-phase system, the neutral is: A. Normal return path for the current B. Abnormal return path for the current C. A and B D. None of the above 13. On the question above, what is the minimum diode power rating that can be used? A. 100 Pz = Izmax * Vz = 5.3 * 24 = 128W B. 150 C. 500 D. 600 14. Which of the following characteristics is not typical of a project manager: A. Managing a temporary activity B. Possesses in depth technical knowledge C. Managing a non-repetitive activity D. Manages independently of the formal organization Page 2 of 17 15. Synchronous speed for motor 1200 RPM, 100Hz. Calculate number of poles? A. P=2 B. P=4 C. P=6 D. P = 10 16. The CPU architecture shown in the figure below is best described as: A. Non-pipelined architecture B. 1-Stage pipeline architecture C. 2-Stage pipeline architecture D. Harvard architecture 17. While machine in operation, the slip of the synchronous machine is: A. High B. Low C. Zero D. 1 18. A room with a floor area of 50ft x 30ft and a ceiling height of 10ft has luminaries suspended 2ft from the ceiling. Assuming a working plane of 30in and a required illumination level of 50fc, the net luminous flux (lumens) using fixtures with a coefficient of utilization of 0.78 is most nearly: A. 48000 B. 58000 C. 75000 D. 96000 19. Block plot shown below, what type? A. High pass filter B. Low pass filter C. Band pass filter D. Band stop filter Page 3 of 17 20. In HDL Based digital systems the arithmetic multiplication function is difficult to synthesize. Design solution to this challenge do not include: A. Sequential generation of partial products B. Hardware intensive simultaneous generation of partial products C. Implementation of booths algorithm to minimize generation of partial products D. Sequential right shifts of the arguments 21. Intersymbol interface is eliminated by applying which of the following? A. Nyquist Criterion B. Pulse Code Modulation C. Shannon Bandwidth D. SSB Modulation 22. Which is liquid in the following substances? A. Al B. In C. Hg D. Ni 23. Which of the following is based on Ohm’s Law? A. Time B. Power C. Current D. None 24. Harmonic currents present in a power system may cause: A. Excessive heating B. Malfunctioning of the control and regulating circuits C. Resonance D. All of the above 25. How can we convert in to cm? A. Multiply by 2.45 B. Multiply by 2.44 C. Multiply by 2.54 26. Which of the following types of material has high thermal and electrical conductivity? A. Ceramic B. Metal C. __________ (any other write here) Page 4 of 17 27. The bode plot for the circuit shown A = V2 / V1, is: A. B. C. D. 28. Which one is the highest input impedance? A. NPN-BJT B. MOSFET C. Both 29. A differential relay designed to protect a zone of the distribution system, uses current transformer (CTs) connected to annually CTs. The auxiliary CTs must match both the phase shift and the ratio of the differential relays CTs if the values do not match. Which of the following is the least likely outcome? A. The trip could occur at a lower level than expected. B. The trip could occur at a higher level than expected. C. The trip could occur under a non-fault condition. D. The trip could occur only when the CTs are wired in parallel. 30. A biomedical signal is sampled at 128Hz, no anti-aliasing fiber is used. Spectral analysis on the sampled data shows strong sit. The most likely source of the 58 Hz component is: A. Power line artifact picked up by the equipment B. 70 Hz source in the original signal C. Random noise in the original signal D. 122 Hz source in the source signal Page 5 of 17 31. A system with an initial cost of 90000 dollars has an operating cost of 2.50 dollars per hour and is operated 16hr/day for 300 days/year. After 10 years, the system has salvage value of 10000 dollars. Assuming the interest rate is constant at 10% the total analyzed cost over the 10-year life is most nearly: A. $12000 B. $14000 C. $20000 D. $26000 32. Of the following engineering discipline which would be best suited to manage the construction of a natural gas pipeline? A. Petroleum Engineer B. Mechanical Engineer C. Civil Engineer D. Chemical Engineer 33. When an activity network is developed by using forward and backward pass we can find out: A. The longest time period that the project will take. B. The number of total slacks that project managers might have. C. The number of free slacks in the network. D. the earliest and latest time that an activity can finish. E. Only A and B are correct. F. Only A, B and C are correct. G. A, B, C and D are all correct. 34. Two tower antennas with height of 90 meter. What is the maximum distance between them for good communication? A. 20 km D = 2 * √2hr = 2* √2*6371000*90 = 67km B. 30 km h = 90m, r = radius of earth = 6371000m C. 40 km D. 80 km 35. Why steel is used in concert structure because: A. they are cheap B. good bond C. highly rigid D. temperature expansion coefficient is same with cement (concrete) 36. An engineer is offered some additional gifts and services in exchange for using superior materials on a remodeling project. This was not detailed in the contract. He should: A. Take the offer and use the special materials. B. Reject the offer. C. Ask her boss which of the gifts to accept. D. Accept the gifts but use the materials specified in the contract in order to retain neutrality. Page 6 of 17 37. You are a project manager for a company that supplies parts to the government. Part of your budget plan shows an average can reduce move units. What theory that describes the rationale for the budget planning? A. Theory of Constraints B. Law of Diminishing Return C. Economics of Scale Theory D. Learning Curve Theory 38. The extensive use of gypsum wall board in residential, commercial and industrial construction items from all the following is a gypsum board characteristic except: A. Low cost in construction B. Ease of Installation or can be easily formed in different shapes C. Recycle ability or can be recycled D. Fire resistance 39. Which of the following is not considered to be a characteristic of a project? A. an established objective B. a clear beginning and end C. only for internal use D. never been done before 40. The equivalent circuit of induction machine at no load is the same as that of the transformer but with: A. Open circuited secondary B. Short circuited secondary C. Open circuited primary D. Short circuited primary 41. The interdisciplinary nature of engineering has implications for the appropriateness of specialization. Which of the following is correct? A. Since all engineering projects are interdisciplinary, all engineers should be expert in all fields of engineering. B. The interdisciplinary nature of engineering means that all engineers should study general engineering rather than specialize in a single area. C. Most engineers will wish to specialize, but all engineers must be able to work effectively alongside others with complementary skills. 42. In a typical computer architecture, the minimum set of registers necessary for general operation will include: A. Accumulation general register one or two B. Accumulation general register one and two instruction register, memory address register, memory buffer register, program register C. Accumulator memory address register, memory buffer register, program counter D. Accumulator, instruction register, memory address register, memory buffer register, program counter Page 7 of 17 43. A basic Time Domain Reflectometer (TDR) system is used with an oscilloscope to display the waveform at the input end of a line in a Non-Return Zero (NRZ) digital system. A 1000m cable is terminated with a short circuit at the far end. The first reflected wave appears 9.43µs after the incident wave. The actual velocity in the cable divided by the speed of light is: Vp = 2L/To A. 0.35 B. 0.71 C. 1.0 D. 1.41 44. The maximum power in a synchronous machine is obtained when the load angle is: A. 0 B. 90 C. 120 D. 135 45. Increase water cement ratio in concrete mix: A. Results decrease strength B. Reduce workability C. Decrease hydration D. Reduce slump value 46. The voltage waveform generated by an alternator having 4 poles and rotating at 750 RPM will have a frequency of: A. 60 Hz B. 50 Hz C. 25 Hz D. None of the above 47. Which of the following Braking system is used in the induction motor? A. Regenerative Braking B. Plugging Braking C. Dynamic Braking D. All of the Above 48. Induction motor running at synchronous speed, the torque will be: A. Low B. High C. 0 49. Breaking of induction motor: A. Regeneration B. Dynamic C. Plugging D. All of the Above Page 8 of 17 50. The noise margins of an inverter with VOH=3V, VH=2V, VOL=0.5V, VIL=0.8V is: A. NMH=1V, NML=1.5V NMH = VOH – VIH = 3-2 = 1V, VML = VIL-VOL = 0.8-0.5 = 0.3V B. NMH=0.3V, NML=1V C. NM=2.2V, NML=0.3V D. NMH=1V, NML=0.3V 51. Which of the following situations required a change order? A. Change in owners’ scope of work B. Significant change in subsurface conditions C. Design error or omission D. All of the above 52. What is the maximum phase to phase voltage for induction motor in the figure? A. 380V B. 480V C. 540V D. 679V Hint: 679 / √2 53. 3 Phase balanced system with Irms = 60A and 3rd harmonic phase current of 3A. What will be the neutral current? A. 60 / √3 B. 60 √3 C. 9A 54. In Ohms Law current is related to: A. Power B. Energy C. Resistance D. Voltage 55. ____________ activities must be completed immediately before a particular activity. A. Merge B. Burst C. Predecessor D. Successor E. Critical 56. Value engineering has the purpose of: A. Reduces cost by reducing scope B. Modifies work team in order to achieve the best efficiency C. Achieve the project outcomes with the least cost Page 9 of 17 57. In the 3-phase system, the neutral is: A. Normal return path for the current B. Abnormal return path for the current C. A and B D. None of the above 58. The output D in the circuit is: A. B(A+C) B. (A+B) (B+C) C. AB + BC D. (A+B) CB 59. Which circuit breaker in commonly used in the distribution level? A. Air Circuit Breaker B. Air Blast Circuit Breaker C. SF6 Circuit Breaker D. Tank Type Oil Circuit Breaker 60. The equivalent circuit of induction machine at no load is the same as that of the transformer but with: A. Open circuited secondary B. Short circuited secondary C. Open circuited primary D. Short circuited primary 61. The electric flux passing out through a closed surface is equal to: A. The line integral of the surface B. Zero C. The flux density at the surface D. The total charge enclosed by the surface E. The net surface integral of the current 62. What is the minimum gauge size of the earthing cable? A. 20 B. 16 C. 10 D. 8 Page 10 of 17 63. Field programmable gate arrays (FPGAs) and other array logic devices normally contain numerous flip- flops. These flip-flops are generally or the type: A. D B. J-K C. S-R D. T 64. A discrete silicon semiconductor diode is forward biased at 0.75V, what is the approximate current? Hint: VT = Kt/V, I = Is (eVIbVT – 1) A. 2.0 mA B. 3.0 nA C. 1.5A D. 3.0 mA 65. The motor used in travelling crane is: A. Ward Leonard Controlled DC Shunt Motor B. Slip Ring AC Induction Motor C. AC Split Motor D. DC Differentially Compound Motor 66. Your boss has just approved the initiation of a project to celebrate Qatar National Day. Sadia has been assigned the project manager as should be: A. Establish the reporting process to the boss B. Work on the project scope C. Make a report on required cost for the project D. Develop the project charter to do the project E. Ask the boss as to how many team members would be allowed in the project 67. In general, when comparing BJT and MOSFET transistors, three main differences: A. The device that depends more on geometry (width, Length, etc.) is BJT B. The device is capable of higher amplification is MOSFET C. The device that dissipates no power at the input (zero input current) is MOSFET 68. In 50hz induction machine, if the no load speed is 2900 RPM, the slip frequency is: A. 0.33 Hz B. 0.67 Hz C. 1.33 Hz D. 1.67 Hz 69. Changing in the excitation in grid having an alternator connected to it will having the following effect: A. Change in active component of load B. Change in reactive component of load C. Change in Power Factor of Load D. The frequency of the generated wave form will be affected Page 11 of 17 70. Which of the following systems uses Assembly language? A. SCADA B. Microcontrollers C. ASIC D. FPGA E. Both A & B 71. Which of the following is based on Ohm’s Law? A. Time B. Power C. Current D. None 72. What is the bond for attraction of water molecule? A. Covalent Bond B. Ionic Bond C. Metallic Bond D. Van Dar Waals 73. If the rotor is in standstill position, what is slip? A. Zero B. One C. Infinity D. Any Slip 74. An architect visits the site and found out the gypsum installation ongoing is of very low grade, what immediate action should he take? A. Stop the work. B. Inform client that poor material is been used. C. Inform the contractor and mention him that contract is rejected. D. Inform the drywall about his observation at the site. 75. If the motor is running with very heavy load, suddenly the mechanical load is reduced to zero, what will be the affect at the motor? A. Motor will gain synchronous speed. B. Motor will first move above synchronous speed and later stay just below synchronous speed. C. The power factor of motor will increase. D. Motor will run at initial speed 76. What is the theory of utilitarianism? A. Work with self-respect. B. Work with global utilization – happily – maintain it. Page 12 of 17 77. What would an initial investment of 1 million QR be after 5 years if the APR = 9% accumulated monthly? A. 1565681 QR B. 1538624 QR A = P (1+ i /mn) n where m = no of conversion per year = 12 converions per year C. 1711867 QR n= 5years, i = 9% , A = 1000000 (1+(0.09/(5*12))5= 1565681QR D. 1450000 QR 78. Which of the following is not opportunity to do the project? A. Demand of the product B. Emerging markets C. Lot of Manpower D. Favorable exchange rated E. None of these are Organizational opportunities 79. Hysteresis losses appears: A. In non-magnetic material using AC supply. B. In magnetic material using AC supply. C. In non-magnetic material using DC supply. D. In magnetic material using AC supply. 80. 100 resistors of 100 ohm each are connected in parallel. Their equivalent resistance will be: A. 10000 ohms R / N = 100/100 = 1 ohm B. 100 ohms Where N = no of resistors, R = resistance values of each C. 1 ohm D. 1/1000 ohms 81. Cut-off frequency in transistor is defined by: A. Input impedance B. Output impedance C. Power Supply D. External Capacitor 82. The third harmonic of the Fourier series for the waveform in the figure has a frequency (Hz) of: A. 250 B. 750 C. 4712 D. The third harmonic does not exist. Page 13 of 17 83. Major factor to be considered while designing distribution system: A. Efficiency B. Voltage regulation C. Power factor D. Reliability 84. Which one of the following is not an insulating material? A. Asbestos Asbestos. Glass, Thermocoal are insulating material whereas porcelain B. Glass is an insulator C. Porcelain D. Thermocoal 85. Resource Leveling usually results in : More efficient use of labor and equipment. 86. Concepts of resource levelling works by: Shifting non-critical activities within their available float 87. The starting capacitor of a single phase motor is A. Electrolytic type C. Paper Type B. Ceramic type D. None of the above 88. What is the role of ABET (Accreditation Board for Engineering & Technology) A. Accreditation of engineering firms B. Examination for Engineers C. Accreditation of Engineering Programs D. All the above 89. What does the power factor stands for A. Cosine of the angle between voltage and current B. Sine of the angle between voltage and current C. Ratio of active power to the apparent power (kW/kVA) D. Ratio of apparent power to real power 90. Strain Unit A. Dimensionless B. ¼ PI C. PA D. N/MM2 91. What is the function of the barometer? A. Measure the pressure differential B. Related to tube measurement C. Measure the atmospheric pressure D. All of the above 92. Which of the following is not linear regression model? A. Y = a + bx1 + x1x2 Page 14 of 17  B. 2-Y = a + b + (X1 / X2) C. Y = a + X1 + bX22 D. Y = aX1 + X2 93. Which OP-AMP circuit uses resistance in series and capacitance in feedback A. Integrator B. Differentiator C. Band Pass Filter D. Stop Band Filter 94. In which of the following stages are you more likely to find status reports, many changes and the creation of forecasts? A. Conceptualizing B. Defining C. Planning D. Executing E. Delivering 95. Intersecting point for WBS and OBS A. Cost account B. Intersect matrix C. Project matrix D. None of the above 96. The final step in the definition of a work breakdown structure is to A. Assign codes for each activity of the work package B. Assign the cost account to a manager C. Assign the work package to the manager D. Develop the responsibility matrix E. None of these are included in the final step 97. What is the least instructive solution to connect hijacking? A. Use of one-time password B. Physical security of the communication link C. High security login procedures D. Full scale encryption 98. A 10MVA generator has power factor 0.866 lagging, the reactive power produced will be A. 10 MVA Reactive power = VI sinΦ, Given = VI = 10 MAV, CosΦ = 0.866, so B. 8 MVA SinΦ = 0.5, 10*0.5 = 5 MVA C. 5 MVA D. 1.34 MVA Page 15 of 17 99. For a transformer to be tested at full load conditions but consuming only losses from the main, we do load test OC and SC tests back to back test none of the above In OC test there will be only iron losses in the transformer, in SC test there will be only copper loss but under practical conditions both losses occur simultaneously and the temperature rise is due to both losses. To determine iron loss, copper loss and temperature rise for a designated period back to back test or sumpner's test is conducted. 100. A 400V/100V, 10KVA two winding transformer is reconnected as an auto transformer across suitable voltage source. The maximum rating of such an arrangement could be A. 50KVA B. 15KVA 2 winding t/f Secondary current = P/V2 = (10*103) / 100 = 100Amps, C. 12.5KVA Ratings of autotransformer, V2 = 400+100 = 500V, so P=V2I2 = 500*100 = 50KVA D. 8.75KVA 101. A single-phase, 2,200/200 V transformer takes 1 A at the HT side or no load at a power factor of 0.385 lagging. The iron losses are A. 167 W B. 77 W C. 88 W D. 98 W 102. Neglecting resistance, at constant flux density, the power required per kilogram to magnetize the iron core of a transformer is 0.8 W at 25 Hz and 2.04 W at 60 Hz. The power required per kilogram for 100 Hz is A. 3.8 W B. 3.63 W C. 3.4 W D. 5.2 W Page 16 of 17 Morals ; Morals are accepted standards of right and wrong that are usually applied to personal behavior. Moral standards are derived from our parents, religious, background and friends. For maximum Voltage regulation, tan Φ = X / R (or) CosΦ = R / Z For zero voltage regulation, tanΦ = R / X (or) CosΦ = X / Z D’arsonval Meter as a DC ammeter: Rsh = Rm / (n-1), Rsh = Shunt resistance, Rm = meter resistance, n=multiplying factor n = I / Im, I = Full scale value, Im = Meter full scale value D’arsonval Meter as DC voltmeter: Rs = (S*Vrange) – Rm, S = sensivity = 1 / Ifs, Rs= Series resistance, Rm=Meter resistance Six Steps to the Work Breakdown Structure : 1. List of all tasks 2. The task clusters 3. Define work packages 4. Assignment of responsibilities to the work packages 5. Define start and stop dates of work packages 6. Documentation of the created WBS and assignment of unique work package numbers i.e assigning codes Steps of Project Scope Management: 1. Plan your scope 2. Collect requirements 3. Define your scope 4. Create WBS structure 5. Validate your scope 6. Control your scope Page 17 of 17