(Last Updated On: December 8, 2017)
This is the Section 1 Module 10 of the compiled Communications Coaching Materials taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies (EST), Communications Books, Journals and other Communications References. This particular Coaching Notes in Communications Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.
Communications Engineering Coaching: Section 1 Module 10
| ITEM | QUESTIONS | ANSWERS |
| 1 | Human hearing range in octaves | 10 |
| 2 | GPS satellite orbit period | 12 hrs |
| 3 | GPS constellation radius | 20,200 km |
| 4 | Advantage of discone | Broadband |
| 5 | The trouble when the color oscillator does not oscillate | No color |
| 6 | Term for ordinary telephone | POTS (plain old telephone system) |
| 7 | The beat frequency between the 3.58 MHz subcarrier and the 4.5 MHz sound signal | 0.92 MHz |
| 8 | Final amplifier stage | Power amplifier |
| 9 | Threshold pain of acoustic shock | 120 dB |
| 10 | EDGE enhanced GSM | 358 |
| 11 | Standard terrestrial TV transmission | 8VSB |
| 12 | A call that cannot be completed | Blocked call |
| 13 | A vacuum tube used for microwave amplification and oscillation | Klystron |
| 14 | CATV level for sound interruption | 40 dB |
| 15 | CATV is an ex. of Metropolitan area (?) | network |
| 16 | Radio system use to provide high speed data packet | GPRS |
| 17 | The law tat created the MTRCB | PD 1986 |
| 18 | Vertical blanking considered as 3 horizontal lines wide | Vertical sync |
| 19 | System that does not use TDMA | IS 95 |
| 20 | Accessory referred to as magic T | Hybrid T |
| 21 | For TV system, the horizontal flyback is 10% | 6.4 micro seconds |
| 22 | Typical speech power of the human ear | 10 to 1000 micro watts |
| 23 | When was the first mobile phone introduced | Oct 13, 1983 |
| 24 | Number of HDTV horizontal lines | 1125 |
| 25 | Number of NTSC horizontal lines | 525 |
| 26 | Analog sampling rate (?) | PAM |
| 27 | Modulation technique that is noise resistant | PCM |
| 28 | Same as Polytetrafluoroethylene | Teflon |
| 29 | Coaxial cable insulator | PCV |
| 30 | Device located at the middle of a star topography | Hub |
| 31 | 3 segments of GPS | Space segment, user segment, call(?) |
| 32 | WAN physical topography | Packet switching, leased line, circuit switching |
| 33 | In fiber optics, when electromagnetic waves scatter and are about equal or more than its wavelength | MIE scattering |
| 34 | Most significant part or stage of a launched satellite | Initial payload |
| 35 | What is a launched satellite that does not stay in the gravity of the earth and wanders in space | Space probe |
| 36 | Also acts as a high pass filter | Waveguide |
| 37 | Why is FM more efficient than AM? | Because FM uses class C amplifiers |
| 38 | What can achieve a maximum of 100% efficiency | Class C amplifier |
| 39 | What can achieve a maximum of 50% efficiency | Class B amplifier |
| 40 | Measures the entire electromagnetic wave spectrum | Radiometry |
| 41 | Divx (component? Similar format?) | MPEG4 |
| 42 | When you get the code of a mobile & illegally use it in another mobile to make calls | Clone fraud |
| 43 | Why is sidetone necessary? | For the user to know if the telephone is working |
| 44 | Two data transmitted in different directions in different time intervals | Time division duplexing |
| 45 | Max power of class 3 analog mobile phones | 3 Watts |
| 46 | Max power of class 2 analog mobile phones | 600 milli watts |
| 47 | Presidential decree (?) | PD 2004 |
| 48 | 3G (?) | 2001 |
| 49 | When a mobile is simultaneously in the area of coverage/territory of to base stations | Soft handoff |
| 50 | Cost of building a base station | $500,000-$750,000 |
| 51 | Exact frequency of color subcarrier signal (choose 1) | 3.579545 MHz or (sadly) 3.579454 MHz |
| 52 | Uses lead oxide and has minimum lag | Plumbicon |
| 53 | In CATV internet, a 6MHz channel has a data rate of | 27 MHz |
| 54 | Data rate of fiber optics | 20 Gbps |
| 55 | AKA grounded antenna | Marconi antenna |
| 56 | Radiation pattern of the dipole antenna | Figure 8 |
| 57 | Smallest block f data transmitted in a network | Packet |
| 58 | Time in a day that the human can be exposed to 110-120 dB | 20 mins |
| 59 | Deafening level of sound for humans | 120 dB |
| 60 | Navigation system used in ships, submarines, airplanes similar to radar | Inertial Navigation System (INS) |
| 61 | A kind of INS where in the sensor is mounted on the face of the ship for direction | Strap-down transducer |
| 62 | Multiple programs application run simultaneously without interference | Multitasking |
| Multiple programs run without interference | ||
| 63 | 2 ships that sank leading to the creation of (INS?) | Republic and Titanic |
| 64 | Computer network | Server-client, Peer-to-peer |
| 65 | Combination of 2 pts whose magnitudes are equal and opposite in polarity separated by a small space with that of which the filed of dipole that it determines | Electronics doublet |
| 66 | In a client-server network ,what LAN software makes sure that data on the server is being changed by one station and is not simultaneously read by another | Record Locking |
| 67 | What do you think is the main disadvantage of grid-over plate modulation | Lower power efficiency, difficult to adjust |
| 68 | What is another term for pink noise | Flicker noise |
| 69 | What refers to a telephone that rings another phone without dialing | Hot line |
| 70 | Damage to cells other than reproductive cells due to exposure to intense RF radiation is what | Somatic |
| 71 | What do you call the range over… the reference frequency can be… and still achieve phase lock? | Capture range |
| 72 | What deice are to be inserted in a telephone channel if the total via net loss of a given trunk circuit exceeds about 2.5db? | Echo Suppressors |
| 73 | What is the main advantage of fiber optic cables made of plastic? | Inexpensive and more flexible |
| 74 | What LAN topology is used by the classical Ethernet system | BUS topology |
| 75 | If a broadcast station is transmitting but not modulating, what is heard in a receiver tuned to its frequency? | Nothing |
Complete List of Communications Engineering Coaching Materials
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