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Electronics Engineering Objective Questions { Television Engineering }



57. Indicate the false statement. Modulation is used to
A. reduce the bandwidth used
B. separate differing transmissions
C. ensure that intelligence may be transmitted over long distances
D. allow the use of practicable antennas
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58.  One of the following is an indirect way of generating FM. This is the ?modulator.
A. reactance tube
B. varactor diode
C. Armstrong
D. reactance transistor
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59.  Diversity reception normally means
A. reception of diverse programmes
B. reception of programme from a transmitter through two receivers connected to two different aerial structures half wavelength apart.
C. reception of programme from a transmitter through two receivers connected to two different aerials situated a few wavelengths apart.
D. all the above
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60. A carrier is simultaneously modulated by two sine waves with modulation indices of 0.3 and 0.4, the total modulation index
A. is 1
B. cannot be calculated unless the phase relations are known
C. is 0.5
D. is 0.7
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61.  In a pentode, the screen grid
A.reduces the plate grid capacitance
B.reduces the effect of secondary emission from plate
C. increases the trans-conductance of the tube
D. increase the power-handling capacity of the tube
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62.  One of the main functions of the RF amplifier in a superheterodyne receiver is to
A. provide improved tracking
B. permit better adjacent-channel rejection
C. increase the tuning range of the receiver
D. improve the rejection of the image frequency
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63. In an FM receivet, the channel bandwidth is around ? kHz.
A.10
B.20
C.75
D.200
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