2. b it the beez practice 0
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This document contains a collection of questions from various topics including mathematics, communication, electronics, and GEAS (presumably general engineering and applied science) along with their answers. The questions range from easy to difficult and cover concepts such as antenna gain, probability, stress and strain in materials, signal modulation, and more.
![difficult
EASY
SOLUTION
N = (3.5x10^6)(0.45 –
2x0.01)^2 / [(0.04^2)(88–
55)x10^6]
N= 16.18 round up
N = 17](https://image.slidesharecdn.com/2-140919033554-phpapp01/85/2-b-it-the-beez-practice-0-66-320.jpg)
![Difficult
SOLUTION
σ = (3.5)(450 – 2x10) / [2(10)]
= 75.3 MPa](https://image.slidesharecdn.com/2-140919033554-phpapp01/85/2-b-it-the-beez-practice-0-69-320.jpg)
![Difficult
ANSWER
δ = [(7850)(9.8)(150^2) / 2(200X10^9)] +
[(20000)(150)(1000^2) / 300(200X10^9)]
δ = 54.3 mm](https://image.slidesharecdn.com/2-140919033554-phpapp01/85/2-b-it-the-beez-practice-0-72-320.jpg)
2. b it the beez practice 0
- 1. EASY
- 2. EASY MATHEMATICS He was known as the father of modern geometry
- 4. EASY EST a flat conductor separated by an insulating dielectric from a large ground plane that is usually one-quarter or one-half wavelength long
- 6. EASY EST One complete revolution around a Smith Chart represents _________ wavelengths.
- 8. EASY Mathematics These are circles that have the same center.
- 9. EASY ANSWER concentric circles
- 10. EASY Communication The modulated peak value of a signal is 125V and the unmodulated carrier value is 85V. What is the modulation index?
- 11. EASY ANSWER 0.47
- 12. EASY Communication A mismatched transmission line is also referred to as a ___________ line.
- 14. EASY Communications It is the ratio of the speed of propagation on a line to that of light in free-space.
- 15. EASY ANSWER velocity factor
- 16. EASY Electronics Which of the following is the most widely used UTP cable that can carry baseband data at rates up to 100 Mbps at a range up to 100m?
- 17. EASY ANSWER CAT 5
- 18. EASY GEAS This component measures the pulling (or pushing) action perpendicular to the section
- 19. EASY ANSWER Axial forces
- 20. EASY GEAS It is the point at which there is an appreciable elongation of the material without any corresponding increase of load
- 21. EASY ANSWER Yield point
- 22. average
- 23. average COMMUNICATION Determine the phase-shift represented by a 75 ns delay of a 4 MHz signal to a 75-ft cable with a dielectric constant of 2.3.
- 24. EASY ANSWER 108 degrees average
- 25. average EASY SOLUTION Θ = 360 td / T T =1/f = 1 / 4MHz = 250 ns Θ = 360 (75) / 250 = 108 degrees
- 26. average EASY EST The input to an FM receiver has a S/N of 2.8. What is the frequency deviation caused by the noise if the modulating frequency is 1.5KHz and the permitted deviation is 4KHz?
- 27. EASY ANSWER 547.8 Hz average
- 28. average EASY Solution = fm = sin -1 N/S = sin -1 1/2.8 = 0.3652 = (0.3652)(1.5KHz) = 547.8 Hz
- 29. average EASY EST What circuit is used to return the frequency response of a signal to its normal, “flat” level?
- 30. EASY ANSWER de-emphasis average
- 31. Mathematics average EASY Let k be the number of gallons of a 50% silver nitrate solution that are added to 15 gallons of a 30% silver nitrate solution to produce a 35% silver nitrate solution. Let w be the number of sides of a regular polygon whose degree measure of one of the exterior angles is 8. Find the value of (k+w).
- 32. EASY ANSWER 50 average
- 33. EASY Mathematics In how many distinct points do the real graphs of Intersect? average
- 34. EASY ANSWER 2 average
- 35. average EASY GEAS It is the maximum safe stress that a material can carry
- 36. EASY ANSWER working stress average
- 37. average EASY Communications It is the most common means of overcoming the problems of quantizing error and noise.
- 38. EASY ANSWER companding average
- 39. EASY Electronics It can be used in a single-stage oscillator circuit to provide a pulse signal suitable for digital-circuit applications. average
- 40. average EASY ANSWER UJT or unijunction transistor
- 41. average GEAS A large pipe, called a penstock in hydraulic work, is 1.5 m in diameter. It is composed of wooden staves bound together by steel hoops, each 300 sq. Millimetre in cross-sectional area, and is used to conduct water from a reservoir to power a house. If the maximum tensile stress permitted in the hoops is 130 MPa, what is the maximum spacing between hoops under a head of water of 30 m?
- 42. AVErage ANSWER L = 177 mm
- 43. AVErage SOLUTION (1000)(9.81)(30)(1.5)L = 2(300x10^- 6)(130x10^6) L = 177 mm
- 44. average GEAS At what angular velocity will the stress in a rotating steel ring equal to 150 MPa if its mean radius is 220 mm? The density of the steel is 7.85 Mg/m^3.
- 45. AVErage ANSWER 628 rad/s
- 46. AVErage ANSWER ω = (1/0.22)(150x10^6 / 7850)^(1/2) ω = 628 rad/s
- 47. Difficult
- 48. difficult COMMUNICATION It means that the characteristics and performance of an antenna are the same whether the antenna is radiating or intercepting an electromagnetic signal.
- 49. EASY ANSWER antenna reciprocity difficult
- 50. difficult EASY EST Which of the following methods is used to lower the resonant frequency of a shortened vertical antenna?
- 51. EASY ANSWER top hat loading difficult
- 52. difficult EASY EST Calculate the gain (relative to an isotropic) of a parabolic antenna that has a diameter of 3 m, an efficiency of 60% and operates at a frequency of 4 GHz.
- 53. EASY ANSWER 39.8 dBi difficult
- 54. SOLUTION EASY G = 2 D2/ 2 = 3x108/ 4MHz = 0.075 m G = 0.62(3)2 0.0752 G= 9474.8 G = 10 log 9474.8 G = 39.8 dBi difficult
- 55. difficult EASY Mathematics Team A and B play a series of games. The first to win two games wins the series and Team A has a 70% chance of winning any game. What is the probability that Team A wins the series?
- 56. EASY ANSWER 0.784 difficult
- 58. EASY ANSWER 49 difficult
- 59. difficult EASY Communication It is a phenomenon caused by any support insulators used at the ends of the wire antenna.
- 60. EASY ANSWER end effect difficult
- 62. EASY ANSWER 16.2 Hz difficult
- 64. GEAS difficult EASY A pipe carry steam at 3.5 MPa has an outside diameter of 450 mm and a wall thickness of 10 mm. A gasket is inserted between the flange at one end of the pipe and a flat plate use to cap the end. How many 40-mm-diameter bolts must be used to hold the cap on if the allowable stress in the bolts is 80 MPa, of which 55 MPa is the initial stress?
- 65. EASY ANSWER N = 17 difficult
- 66. difficult EASY SOLUTION N = (3.5x10^6)(0.45 – 2x0.01)^2 / [(0.04^2)(88– 55)x10^6] N= 16.18 round up N = 17
- 67. Difficult GEAS A pipe carry steam at 3.5 MPa has an outside diameter of 450 mm and a wall thickness of 10 mm. A gasket is inserted between the flange at one end of the pipe and a flat plate use to cap the end. What circumferential stress is developed in the pipe?
- 68. Difficult ANSWER = 75.3 MPa
- 69. Difficult SOLUTION σ = (3.5)(450 – 2x10) / [2(10)] = 75.3 MPa
- 70. GEAS Difficult A steel rod having a cross-sectional area of 300 sq. Meters and a length of 150 m is suspended vertically from one end. It supports a tensile load of 20 kN at the lower end. If the unit mass of steel is 7850 kg/m^3 and E = 200x10^3 MN/m^2, find the total elongation of the rod.
- 71. Difficult Answer δ = 54.3 mm
- 72. Difficult ANSWER δ = [(7850)(9.8)(150^2) / 2(200X10^9)] + [(20000)(150)(1000^2) / 300(200X10^9)] δ = 54.3 mm