A Best Way To Crack Gorenment Job Exams

ECE Objective Questions { Antenna }



71. A seven element parasitic array of the Yagi type to be used as a TV receiving antenna would preferably have
A. two dipoles, three reflectors and two directors
B. two dipoles, four directors and one reflector
C. one dipole, four directors and two reflectors
D. one dipole, five directors and one reflector

72. Most commonly used antenna type with TV receivers is the
A. V-antenna
B. rhombic antenna
C. loop antenna
D. yagi antenna

73. Electrical length or effective length of an antenna is
A. same as its physical length
B. greater than its physical length
C. smaller than its physical length
D. none of these

74. An added capacitance
A. increases the effective length of the angenna
B. decreases the effective length of the antenna
C. has no effect on antenna's length
D. none of these

75. An added inductance
A. decreases the resonant frequency of the antenna
B. increases the resonant frequency of the antenna
C. compensates for parasitic capacitances
D. none of these

76. An antenna to be used for a band of frequencies from 60 to 65 MHz was designed for 65 MHz. The tuning element required is
A. a variable inductance
B. a variable capacitance
C. a fixed capacitance
D. none of these

77. Gain of a non-resonant V-antenna is
A. same as that of a non-resonant rhombic antenna
B. less than that of a non-resonant rhombic antenna
C. greater than that of a non-resonant rhombic antenna
D. none of these

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