MCQ in Broadcasting and Cable TV System Part 11 | ECE Board Exam

(Last Updated On: October 10, 2018)

This is the Multiples Choice Questions Part 11 of the Series in Broadcasting and Cable TV System as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in Radio Transmitter
• MCQ in AM and FM
• MCQ in Television
• MCQ in Studio (Microphone, Amplifiers, Cameras, Lighting, etc.)
• MCQ in Cable Television

Continue Practice Exam Test Questions Part 11 of the Series

Choose the letter of the best answer in each questions.

501. Which is used in closed-circuit TV?

A. Vidicon

B. Iconoscope

C. Image orthicon

D. Kinescope

502. What is the waveform of the sweep voltages?

A. Trapezoidal

B. Sawtooth

C. Trigger

D. Square

503. If the pulse peak is 100% modulation, what is the blanking level?

A. 25%

B. 50%

C. 65%

D. 75%

504. What device allows one camera to accept pictures from three or more projectors?

A. Film multipliers

B. Film demultiplexers

C. Film multiplexers

D. Film acceptor

505. What is the order of scanning four successive motion-picture frames for TV?

A. 3,2,3,2

B. 2,3,2,3

C. 2,2,3,3

D. 3,3,2,2

506. From the low-frequency end of a channel, what is the visual carrier frequency?

A. 3.58 MHz

B. 0.25 MHz

C. 1.25 MHz

D. 4.5 MHz

507. The circuits make up the front end of a TV receiver, except:

A. RF

B. Mixer

C. IF

D. Oscillator

508. What is the impedance at the antenna input terminals of a TV receiver?

A. 300 ohms

B. 150 ohms

C. 50 ohms

D. 100 ohms

509. Why are triodes and MOSFETs best for TV RF amplifiers?

A. High power

B. Efficiency

C. Low noise

D. High gain

510. In what circuit configuration are triodes and MOSFETs used?

A. Cascade

B. Darlington

C. Cascade

D. Shunt

511. The signal might a video amplifier amplify?

A. Aural IF

B. Video

C. Blanking

D. Any of these

512. When coupling from a sync separator, what is used to obtain the horizontal sync pulses?

A. Integrator

B. Corrector

C. Differentiator

D. Separator

513. When coupling from a sync separator, what is used to obtain the vertical sync pulses?

A. Integrator

B. Corrector

C. Differentiator

D. Separator

514. The type of active device used in horizontal output stages, except:?

A. Vacuum tube

B. FET

C. BJT

D. SCR

515. What should be produced by weak blue, weak green, and weak red signals on a color CRT?

A. White

B. Shade

C. Gray

D. Off white

516. How many such mirrors are required in a color TV camera?

A. One

B. Two

C. Three

D. Four

517. What is the combining circuit called in TV?

A. Combiner

B. Multiplexer

C. Integrator

D. Mixer

518. What is the letter symbol for the luminance signal?

A. R

B. Q

C. I

D. Y

519. What is the total R + G + B for a Y signal?

A. 0

B. 1

C. 2

D. 1.5

520. If a white scene is picked up what is the Y value?

A. 1

B. 2

C. 0

D. 2.5

521. If a black scene is being picked up, what is the Y value?

A. One

B. 0.5

C. Zero

D. 1.5

522. What circuit does a color killer kill?

A. Bandstop filter

B. High-pass filter

C. Low-pass filter

D. Bandpass filter

523. If the blue dot is always at the bottom of a triad, what position must the blue gun always have?

A. Top

B. Left side

C. Right aside

D. Center

524. How many cathodes in a shadow-mask picture tube?

A. 1

B. 2

C. 3

D. 4

525. How many guns in a shadow mask picture tube?

A. 1

B. 2

C. 3

D. 4

526. What is the frequency tolerance for the RF carrier in the standard AM radio broadcast band?

A. Zero

B. 20 Hz

C. 10 Hz

D. 20 KHz

527. The transmitting antenna for an AM broadcast station should have a ________ polarization.

A. Vertical

B. Horizontal

C. Circular

D. Elliptical

528. The part of a broadcast day from 6 PM to 6 AM local time

A. Daytime

B. Nighttime

C. Bed time

D. Experimental period

529. The service area where the signal is not subject to fading and co-channel interference.

A. Primary Service Area

B. Secondary Service Area

C. Intermittent Service Area

D. Quarternary Service Area

530. It is a resistive load used in place of an antenna to test a transmitter under normal loaded condition without actually radiating the transmitter’s output signal.

A. Auxiliary Tx

B. Main Tx

C. Secondary Tx

D. Artificial Antenna

531. The operating power of the auxiliary transmitter shall not be less than _____% or never greater than the authorized operating power of the main transmitter.

A. 5

B. 10

C. 15

D. 20

532. What are the frequency limits of the MF BC band?

A. 300-3000 kHz

B. 3-30 MHz

C. 535-1605 kHz

D. 88-108 MHz

533. The center to center spacing between two adjacent stations in the Phil. AM BC band is _______.

A. 9 kHz

B. 200 kHz

C. 36 kHz

D. 800 kHz

534. How many AM stations can be accommodated in a 150-kHz bandwidth if the highest modulating frequency is 10 kHz?

A. 10

B. 15

C. 7

D. 14

535. Short wave broadcasting operates in what band?

A. MF

B. HF

C. VHF

D. VLF

536. What does the acronym STL stand for?

A. Station-to-link

B. Signal-to-loss-ratio

C. Shout-to-live

D. Studio-to-transmitter-link

537. One of the main considerations in the selection of antenna site is (AM)

A. Conductivity of the soil

B. Height of the terrain

C. Elevation of the site

D. Accessibility

538. One of the broadcast transmission auxiliary services is:

A. Remote pick-up

B. STL

C. Communication, Coordination and Control

D. All of these

539. What is the spacing between any two adjacent channels in the FM broadcast band?

A. 20 KHz

B. 36 KHz

C. 200 KHz

D. 800 KHz

540. The first channel in the FM BC band has a center frequency of

A. 88 MHz

B. 88.1 MHz

C. 88.3 MHz

D. 108 MHz

541. What is the radio transmission of two separate signals, left, and right, used to create a multidimensional effect on the receiver?

A. SCA

B. Stereo system

C. Pilot transmission

D. Monophonic transmission

542. The carrier frequency tolerance for FM broadcasting is ________.

A. 25 kHz

B. 2 kHz

C. 20 kHz

D. 30 kHz

543. What is the modulation used by the stereophonic subcarrier?

A. FM

B. PM

C. ISB

D. DSB

544. What is the pilot signal for stereo FM?

A. 4.25 MHz

B. 10 kHz

C. 19 KHz

D. 38 KHz

545. With stereo FM transmission, does a monaural receiver produce all the sounds that a stereo does?

A. Yes

B. No

C. Either a or b

D. Neither a or b

546. 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

547. Where is the pre-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

548. The normal frequency for an SCA subcarrier is _________ KHz.

A. 67

B. 76

C. 38

D. 19

549. A monaural FM receiver receives only the ________ signal of a stereo multiplex transmission.

A. L + R

B. L – R

C. Both a & b

D. 67 KHz

550. When fed to the stereo FM modulator, in what form are the L – R signals?

A. AF

B. DSBSC

C. 19 kHz

D. 38 kHz

Questions and Answers in Broadcasting and Cable TV System Series

Following is the list of multiple choice questions in this brand new series:

Complete List of MCQ in Communications Engineering per topic