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Homework answers / question archive / De La Salle Philippines - ELECTRONIC TRANMAC Compilation of Multiple Choice Questions from various sources (pinoybix, past quizzes) 1)What is the allowable deviation ratio of commercial FM broadcast? a

De La Salle Philippines - ELECTRONIC TRANMAC Compilation of Multiple Choice Questions from various sources (pinoybix, past quizzes) 1)What is the allowable deviation ratio of commercial FM broadcast? a

Electrical Engineering

De La Salle Philippines - ELECTRONIC TRANMAC

Compilation of Multiple Choice Questions from various sources (pinoybix, past quizzes)

1)What is the allowable deviation ratio of commercial FM broadcast?

a. 20        b. 75    c. 5      d. 25

 

  1. What is the frequency tolerance of an FM Radio Broadcast station?

a. ± 20000 Hz                        b. ± 20 Hz        c. ± 200 Hz  d. ± 2000 Hz

 

  1. For Metro manila, the classification of prime-time blocks for FM shall be

a. 6:00 AM to 8:00 PM b. 6:00 AM to 12:00 NN

c. 6:00 AM to 6:00 PM d. 12:00 NN to 12:00 MN

 

  1. For provincial station, the classification of prime-time blocks for FM radio shall be

a. 6:00 AM to 8:00 PM b. 6:00 AM to 12:00 NN

c. 6:00 AM to 6:00 PM d. 12:00 NN to 12:00 MN

 

  1.           is the time circulation for one horizontal trace

a. 52 us            b. 62 us            c. 48 us            d. 50 us

 

  1. What causes snow in television?

a. High Q in the tuned circuit b. Excessive gain

c. Random noise in the signal d. Insufficient wave traps

 

  1. Which of the following filters block FM radio band for TV channels (2 to 13)?

a. High-pass filter       b. Low-pass filter

c. Band pass filter       d. Band-reject filter

 

  1. What is the allowable frequency deviation of a commercial FM broadcast band?

a. 15 kHz         b. 75 kHz         c. 5 kHz            d. 100 kHz

 

  1. The final amplifier of either FM or AM transmitter is operated as

a. Class A         b. Class B         c. Class C         d. Class D

 

  1. The main functions of the RF amplifier in a superheterodyne receiver is to

a. Provide improved tracking                                     b. Permit better adjacent-channel rejection

c. Improve the rejection of the image frequency      d. All of these

 

  1. CCIR transmission standards for FM sound broadcasting at VHF

a. Rec 601.2  b. Rec 501.2    c. Rec 500.4    d. Rec 450.1

 

  1. MDS means

a. Multipoint Distribution Service      b. Multipoint Digital Service

c. Maritime Data Standards               d. Multipoint Drop Standards

 

  1. What is the channel number of an FM station with 88.1 MHz carrier?

a. 201              b. 202              c. 203              d. 204

 

  1. If an FM station has an effective radiated power of 100 kW then it is under what class?

a. Class A         b. Class B         c. Class C         d. Class D

 

  1. Line-of-sight transmission is a characteristic of propagation for the

a. VHF and UHF bands                                    b. VHF bands but not the UHF band

c. Low radio frequencies below a MHz          d. AM picture signal but not the FM sound signal

 

  1. One of the following processes or system best describe an example of a pilot tone system normally use in commercial broadcast FM stations.

a. Time division           b. Frequency division

c. Stereo multiplex      d. QSK

 

  1. What kind of emission would your FM transmitter produce if its microphone failed to work?

a. An unmodulated carrier                 b. A phase modulated carrier

c. An amplitude-modulated carrier    d. A frequency modulated carrier

 

  1. Type of radio communication transmission utilizing frequency modulation technique

a. Television                                        b. Broadcasting in 535-1606 kHz

c. Single side band HF transmission   d. Television Audio

 

  1. In stereo FM, a 38 kHz subcarrier is used for the L-R signal. It is derive from a pilot subcarrier of

a. 9.5 kHz        b. 38 kHz         c. 19 kHz          d. 76 kHz

 

  1. Where does the FM broadcast band located in the spectrum band?

a. ELF band      b. UHF band    c. HF band       d. VHF band

 

  1. What is the reason why Frequency modulation is used in the broadcast video recording on tape?

a. High capacity                      b. Low noise

c. Compressed bandwidth      d. Faster recording

 

  1. As part of the KBP Technical Requirement for FM which polarization was not recommended for use?

a. Horizontal   b. Vertical       c. Circular       d. Elliptical

 

  1. Two FM broadcast stations are in Quezon City and another in Manila proper may be authorized to operate with a frequency separation less than 800 kHz.

a. True             b. False            c. Cannot tell   d. Sometimes

 

  1. Which broadcast parameter of the primary FM station is allowed to be changed in the operation of FM broadcast translator?

a. Frequency                           b. Power                      c. Information content            d. A and B

 

  1. In determining an antenna’s height above average terrain (HAAT), how many radial directions from the site are involved in the computation?

a. 4      b. 8      c. 12    d. 16

 

  1. If DZFE 89.7’s antenna height above average terrain (HAAT) is 190 feet, what is the depression angle of the radio horizon?

a. 0.17°            b. 0.21°            c. 0.27°            d. 0.31°

 

  1. The method of generating FM used by broadcasting station is

a. Direct          b. All of these  c. Indirect        d. Insertion

 

  1. he frequency spectrum of the stereophonic FM signal.

 

a. 67 kHz                     b. 59.5 kHz – 74.5 kHz             c. 19 kHz – 38 kHz       d. 30 kHz - 53 kHz

 

  1. In stereophonic broadcast, the center frequency of each SCA Subcarrier shall be kept at all times within                                                                                                                                                        Hz of the authorized frequency.

a. 200              b. 300              c. 400              d. 500

 

  1. A class A FM station is limited in antenna height of          feet above average terrain. a. 1000                     b. 2000         c. 4000            d. 5000

 

  1. With which emission type is the capture-effect more pronounced?

a. CW              b. FM               c. SSB               d. AM

 

  1. A class D FM station shall have an authorized power not exceeding     watts. a. 20      b. 15                c. 10   d. 5

 

  1. Class B FM station should have an ERP not exceeding     kW. a. 50          b. 40                c. 30                  d. 20

 

  1. What is a frequency discriminator?

a. An FM generator                                                    b. A circuit for detecting FM

c. A circuit for filtering two closely adjacent signals d. An automatic bandwidth circuit

 

  1. Class B FM station shall have an authorized transmitter power not exceeding kW.

a. 10                b. 100              c. 1000            d. 10000

 

  1. A class C FM station has an authorized power not exceeding     watts of ERP. a. 500                 b. 750                        c. 1000              d. 2000

 

  1. A class B FM station is limited in antenna height of                 feet. a. 1000    b. 500                c. 250              d. 100

 

  1. The channel spacing in the Philippine FM broadcast standards

a. 400 kHz       b. 800 kHz       c. 600 kHz        d. 200 kHz

 

  1. The stereophonic subcarrier suppression level in the Philippines standards

a. less than 4% modulation of the main carrier         b. less than 3% modulation of the main carrier

c. less than 2% modulation of the main carrier         d. less than 1% modulation of the main carrier

 

  1. The intermediate frequency used in for FM broadcasting Philippine standards. a. 455 kHz      b. 10.7 MHz     c. 11.4 MHz      d. 12.5 MHz

 

  1. Class of FM station where its authorized power should not exceed 15 kW.

a. Class A         b. Class B         c. Class C         d. Class D

 

  1. A monoaural FM receiver receives only the      signal of a stereo multiplex transmission

a. L+R              b. L-R               c. Both a and b            d. 67 kHz

 

  1. An additional channel of multiplex information that is authorized by the FCC for stereo

a. STL               b. SCA              c. EBS              d. EIA

 

  1. Where is de-emphasis added in a stereo FM system?

a. Before the matrix at the TX            b. Before the matrix at the RX

c. After the matrix at the TX               d. After the matrix at the RX

 

  1. What is the deviation ratio for commercial FM? a. 1 b. 2  c. 5      d. 10

 

  1. Standard emission for FM broadcast

a. A3E              b. C3F              c. F3E               d. B8E

 

  1. This is employed to prevent too much of the signal from overshooting the nearest part of the intended coverage area.

a. Beam tilt     b. Null fill        c. Phasing        d. Top load

 

  1. An antenna that is formed by placing two dipoles at right angles to each other, 90 degrees out of phase.

a. Loop antennab. Whip antenna       c. Turnstile antenna    d. Rhombic antenna

 

  1. Where are the current nodes in a half-wave dipole?
  1. At the ends
  2. Three-quarters of the way from the feed toward the end
  3. One-half of the way from the feed point toward the end
  4. At the feed point

 

  1. Top loading is used in an antenna in order to increase its

a. Practical height       b. Beamwidth              c. Effective height       d. Input capacitance

 

  1. FM broadcasting is a broadcast technology pioneered by

a. Erwin Howard Armstrong               b. Edwin Leonard Armstrong

c. Edwin Howard Armstrong               d. Edwin Bernard Armstrong

 

  1. It is a station from the European Broadcasting Union for sending small amounts of digital information using conventional FM radio broadcasts.

a. RDS              b. RBDS           c. EBS              d. DBS

 

  1. It is a station that operates on the same frequency as the primary FM station.

a. FM Broadcast Translator                b. FM Broadcast Booster Station

c. FM Broadcast Auxiliary Station      d. A and B

 

  1.       is the ratio of the effective free-space field intensity produced at 1.6 kms in the horizontal plane for 1kW input power to 137.6mV/meter.

a. Injection ratio                     b. Antenna field gain

c. Antenna power gain            d. S/N ratio

 

  1.             is the ratio of the actual frequency swing and + 75 kHz expressed in percentage form.

a. Percent modulation            b. Injection ratio         c. Modulation index

 

  1. The standard FM radio broadcast band belongs to which frequency band?

a. MF               b. HF                c. VHF              d. LF

 

  1. Standard FM broadcasting uses for greater gain.

 

a. circularly polarized antennas         b. several identical antennas

c. both A and B                                    d. vertically polarized antennas

 

  1. The FM broadcast band can accommodate about how many stations in Metro Manila starting from 88.3 kHz?

a. 25                b. 30                c. 35                d. 100

 

  1. Where is/are the maximum voltage point/s in a λ/2 antenna?

a. center                      b. λ/8 points                c. ends             d. both A and C

 

  1. How many channels are available in the FM band?

 a. 99               b. 100              c. 101      d. 102

 

  1. 99.7 MHz FM station   in Quezon City.
  1. Can operate . . . because it is too far from 88.3 MHz
  2. Preferably cannot be used because of its frequency difference with 96.3 MHz
  3. Preferably cannot be used because of its frequency difference with 89.1 MHz
  4. Can operate in the City of Manila.

 

  1. FM broadcast is considered   .

a. NBFM                      b. WBFM                     c. LPFM                       d. both A and B

 

  1. In FM stereo multiplex without SCA the modulation done by the main channel must not exceed.

a. 7.5 kHz                    b. 6 kHz                       c. 67.5 kHz                   d. 33.75 kHz

 

  1. The modulation done by the stereophonic sub channel in FM stereo must not exceed

a. 7.5 kHz                    b. 33.75 kHz                c. 67.5 kHz                   d. 6 kHz

 

  1. An FM station is transmitting the L and R channels using the common stereo encoder circuit but is not transmitting the pilot subcarrier, a stereo receiver produces

a. the original L+R      b. R only                      c. L only                       d. produces L+R

 

  1. What is the minimum electrical distance between bays of an antenna system used at 89.3 MHz FM when the coaxial line is used has vf = 0.69?

a. 3.4m                        b. 2.3m                        c. 1.15m                      d. 1.7m

 

  1. What is the theoretical antenna gin reference to an isotropic radiator of a 4 – bay shunt – fed slanted dipole antenna with a bay gain of 0.9 dB, over a half – wave dipole?

a. 6.9 dB                      b. 2.148 dB                  c. 4.9 dB                      d. 9.048 dB

 

  1. dzMB Love Radio in Metro Manila has a transmitter power of 25 kW and with antenna gain of 6 dB. It is a class                                                                                                                                                                         

station.

a. A                  b. B                  c. C                  d. D

 

  1. All available bays for FM broadcasting in used today are based on

a. Marconi Antenna                b. quarter-wave dipole

c. both A and B                        d. half-wave dipole

 

  1. Basically, what should be the electrical distance between bays of an FM antenna system operating at 100.3 MHz using a transmission line with velocity factor of 0.69 and a characteristic impedance of 50 ohms?

a. 1.032 m                   b. 2.064 m                   c. 4.128 m                   d. both B and C

 

 

  1. Which of the following frequencies preferably should not be used in Tuguegarao if 89.3 MHz already exist?

a. 99.9 MHz                 b. 99.7 MHz                 c. 98.9 MHz                 d. 101.5 MHz

 

  1. Which one of the following best describes pre – emphasis?
  1. Is done at the receiver.
  2. Amplification of the low frequency components of the audio frequencies.
  3. Amplification of the high frequency components of the audio frequencies.
  4. Amplification of the high frequency part of the composite modulating signal.

 

  1. What is the maximum allowable deviation done by the pilot subcarrier signal to the carrier frequency?

a. 75 kHz                     b. 7.5kHz                     c. 33.75 kHz                 d. 25 kHz

 

  1. To tilt the radiation pattern of a 4 – bay FM antenna system downward, the upper bank is made 30 degrees leading the lower bank. If the main transmission line is connected to the lower bank, what is the minimum length of the transmission line used to connect the upper and lower banks? Assume vf=0.69, fc=100.3MHz, physical distance between bays is 1.496 m.

a. 2.742 m                   b. 1.371 m                   c. 1.892m                    d. 0.946 m

 

  1. What is the FM broadcast band in the Philippines?

a. 88.1 MHz to 107.9 MHz                  b. 526.5 kHz to 1705.5 kHz

c. 536 kHz to 1605 kHz                        d. 88-108 MHz

 

  1. Which of the following is not an FM transmitting antenna?

a. shunt-fed, slanted dipole                b. Collins

c. Marconi                                           d. Turnstile Antenna

 

  1. What is the minimum physical distance between bays of a multi – bay antenna system to be used for 96.3 MHz operation to limit the effect of mutual coupling between adjacent bays?

a. 3.109 m                   b. 2.332 m

c. 0.777 m                   d. 1.554 m

 

  1. Which one of the following describes a tuned FM antenna?

a. Efficient                   b. High voltage            c. High Impedance      d. All of the above

 

  1. What is the minimum distance between two identical stations operating at 96.5 MHz, 1kW (ERP), 300 for AHAAT?

a. 114 miles                b. 11 miles                  c. 83 miles                   d. 94 miles

 

  1. It is the method of eliminating pattern nulls in FM broadcasting by letting the upper bank of the antenna system radiate more power than the lower bank.

A. beam tilting            b. tuning                      c. null fill                     d. both A and C

 

  1. The two dipoles in a shunt – fed, slanted dipole are usually fed with 900 phase difference through

a. λ/2 transmission line          b. λ/4 transmission line

c. λ/4 boom                             d. λ/4 boom

 

  1. Theoretically, which one of the following is correct regarding an FM antenna with several bays?
  1. Each bay must be matched to the transmission line.
  2. The antenna must be matched to the transmission line with each bay radiating the same power.
  3. The antenna must be matched to the transmission line with each bay radiating the different power.

 

  1. Both A and B.

 

  1. Making the power transmitted by one bank higher than the other bank is called

A. beam tilting            b. pattern null             c. null fill                     d. all of the above

 

  1. Which one of the following is the function of the buffer stage in a broadcast transmitter?

a. Gives high input and output impedance                 b. Gives a high current drive

c. Gives low input and output impedance                  d. Gives a high voltage drive

 

  1. What is the expected 15dBu contour radius produced by a 1kW (ERP), 200ft HAAT FM broadcast station?

a. 85 miles                  b. 95 miles                  c. 75 miles                   d. 9 miles

 

  1. Which one of the following best describes SCA?
  1. Contains stereo multiplex, usually musical signal
  2. It is also used in AM broadcasting
  3. It is the same as the stereophonic subchannel
  4. It is used for the transmission of monophonic and commercial-free programs

 

  1. What is the minimum number of signals in the composite signal of an FM stereo transmitter? a. 1          b. 2                  c. 3   d. 4

 

  1. Describe the RF field produced by a Class A FM transmitter with a tower height of 200ft HAAT.

a. safe for day-to-day exposure                      b. safe for limited exposure

c. safe within 2 hours                                      d. not safe

 

  1. Which of the following cannot be a call sign of an FM broadcast station in the country?

a. DWGM                    b. DZGM                      c. DYKG                       d. KZGM

 

  1. It is the monophonic signal in the FM stereo multiplexed signal.

a. main channel signal            b. main channel          c. stereophonic sound             d. stereo signal

 

  1. Which of the following regulates non – KBP member stations in the Philippines?

a. the NTC                   b. the NAB                   c. Bureau of Broadcast           d. DOTC

 

  1. It is the carrier frequency.

a. Authorized operating frequency     b. Operating Frequency

c. Center frequency                            d. Antenna input frequency

 

  1. Two stations operating at 96.5 MHz and 96.7 MHz. Bot stations operate with a power of 10 kW.

a. 16 miles                  b. 38 miles                  c. 22 miles                   d. 60 miles

 

  1. Which one of the following number of bays produces the most number of pattern nulls? a. 1        b.2                               c. 4                              d. 16

 

  1. The carrier swing of an FM station is ±200 kHz. Determine the percent modulation. a. 37.5%   b. 133.333%                c. 266.667%                 d. 75%

 

  1. Which of the following number of bays in an FM antenna system is not normally used? a. 1                 b. 2                  c. 3   d. 4

 

  1. An FM bay antenna has a gain of 0.9dB, determine how many bays are needed to achieve a theoretical gain of at least 9 dB.

a. 2                  b. 4                  c. 8                  d. 16

 

  1. If the capacitor value of the pre – emphasis circuit is 0.15 uF, what is the resistor value?

a. 500 ?          b. 680 ?          c. 75 ?             d. 750 ?

 

  1. Which one of the following does not describe RDS?

a. Basically the same as RBDS            b. Its sub-carries is a multiple of 18 kHz

c. It is an American standard              d. All of the above

 

  1. A broadcast station used to retransmit the signals of a main FM station in another frequency Broadcast translator station

a. Auxiliary transmitter                      b. Alternate transmitter

c. Broadcast booster station               d. Broadcast translator station

 

  1. Determine the impedance (in ohms) of each bay in a 16 – bay FM antenna system if all bays will be transmitting the same amount of power.

a. 50                b. 800              c. 400              d. 1600

 

  1. Which one of the following is the carrier frequency stability requirement for an FM broadcast station with an authorized carrier frequency of 100.3 MHz?

a. 19.940ppm              b. 0.199 ppm               c. 1.994 pm                 d. 199.402 ppm

 

  1. What is the minimum frequency separation between carrier frequency of FM broadcast stations in a locality?

a. 9 kHz                       b. 200 kHz                   c. 36 kHz                      d. 800kHz

 

  1. The antenna gain of an FM broadcast station is basically      the antenna gain of an AM broadcast station.

a. Greater than           b. Lesser than              d. Equal                       d. Incomparable

 

  1. Which one of the following best describes antenna HAAT?
  1. The height for each radial direction from the antenna
  2. The height of the radiation center above the terrain from 3-16kms from the antenna
  3. The height of the radiation center above the average terrain up to 16kms
  4. The height of the radiation center from the base of the tower

 

  1. Which one of the following is the pilot subcarrier frequency stability requirement for FM broadcast station?

a. +/- 2000Hz              b. +\- 20 Hz                 c. +\- 200 Hz                d. +\- 20 kHz    *no answer; thus, letter e.

 

  1. To maximize the possible number of stations in a locality, which of the following carrier frequencies can be used if

96.5 MHz already exists in that locality?

a. 101.5 MHz               b. 91.1 MHz                 c. 98.5 MHz                 d. 89.3 MHz

 

  1. Which of the following describe/s the antenna system used in FM broadcast?
  1. It has a greater gain compared to AM antenna system
  2. It is horizontally polarized
  3. The magnetic field vector of the TEM emitted is perpendicular to the earth’s surface
  4. all of the above

 

  1. Which one of the following best describes antenna AHAAT?

 

  1. The height of the radiation center of the antenna system from the base of the tower
  2. The height for each radial direction 3-16 kms away from the antenna center in the direction of maximum radiation
  3. The height of the antenna system center above the average terrain 3-16 kms from the antenna
  4. The height of the radiation center above the average terrain up to 16kms

 

  1. A 4-meter span 4-bay antenna system of an FM broadcast station is side-mounted on a 50m tower resting on top of a building. The top of the building is 20 m above sea level. If the average terrain is 9m, what is the AHAAT? Assume the top-most bay is at the top of the tower.

a. 57 m            b. 59 m            c. 61                d. none of the above

 

  1. The practice of stacking identical bays in FM antenna systems to achieve higher gains produces  .

a. minor lobes             b. pattern nulls            c. both A and B            d. neither A nor B

 

  1. Computer for the maximum number of stations that can operate in a locality if 107.9 MHz FM station exists in that locality.

a. 23                b. 24                c. 25                d. 26

 

  1. Which of the following FM carrier frequencies is avoided to be used in a locality if a 100.5 MHz and 101.5 MHz FM stations already exists in that locality?

a. 90.9 MHz                 b. 89.3 MHz                 c. 94.1 MHz                 d. 96.5 MHz

 

  1. The bays used in FM antenna systems are center-fed half-wave dipole-based antennas. At the feed point,                                                                                                                                                            .

a. the current is maximum                 b. the voltage is minimum

c. the impedance is maximum           d. both B and C

 

  1. The carrier frequency 90.7 MHz is used in Manila. Which of the following carrier frequencies cannot be used in Quezon City? Hint: in consideration of attaining maximum number of stations and in compliance with the standards. a. 89.9 MHz                                  b. 96.7 MHz c. 102.6 MHz   d. 105.9 MHz

 

  1. An FM broadcast station can just modulate the carrier by 40%. The equivalent frequency deviation is                                                                                                                                                                 .

a. 75 kHz                     b. 30 kHz                     c. 10 kHz                      d. 37.5 kHz

 

  1. In FM stereo multiplex, the modulation done by the main channel must not exceed           when an SCA exists.

a. 40%                         b. 45%                         c. 90%                          d. 8%

 

  1. The modulation done by the AM stereophonic subchannel in FM stereo must not exceed when there are two SCA channels.

a. 40%                         b. 45%                         c. 90%                          d. 8%

 

 

121. What is the FM Broadcast band in the Philippines?      

122. The FM Broadcast band is divided into how many channels?  

123. What is the bandwidth of FM in the Philippines?          

124. The FM Broadcast channel in the Philippines starts from         to and including     .   

125. The carrier frequency allocated by the authority.        

126. The instantaneous departure of the frequency of the emitted wave from the center frequency resulting from modulation.       

127. Height of the radiation center of the antenna above the terrain 3 to 16 kilometers from the antenna.           

128. The product of the transmitter power multiplied by (a) the antenna power gain or (b) the antenna field gain squared. 

129. In FM, field intensity means the electric field in the     direction.        

130. The service resulting from an assigned ERP and HAAT.           

131. For FM broadcasting, a 100% modulation corresponds to a frequency swing of

132. A signal which is the sum of all signals which frequency modulates the main carrier.           

133. A specified combination of the monophonic or left and right audio signals which frequency modulates the main carrier.       

           

           

           

           

           

           

           

           

           

           

           

 

 

 

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