Question 21 : A 1-MHz monopole antenna must be ________
1. mounted vertically
2. mounted horizontally
3. atleast half lambda wavelength long
4. atleast lambda wavelength long
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Question 22 : A non-resonant antenna will________
1. not transmit
2. not receive
3. cause SWR on the feed cable
4. transmit and receive the signal at the same time
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Question 23 : What is the input impedance to a lossless antenna, at resonance?
1. infinite
2. 0
3. resistive
4. capacitive
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Question 24 : The polarization of plane waves received from satellite is changed by ________
1. Faraday rotation
2. Gamma rays
3. Helical rotation
4. Distance travelled
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Question 25 : 'Ground Effect' in antenna caused by ________
1. faulty connection of the feed cable ground
2. fading
3. buildings and other structures on ground
4. radio signals reflecting off the ground
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Question 26 : What is the full form of ERP?
1. Effective Radiated Power
2. Effective Reflected Power
3. Equivalent Radiated Power
4. Equivalent Reflected Power
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Question 27 : When an antenna radiates more energy in one direction than in other directions, it is called ________
1. selectivity
2. directivity
3. active antenna
4. resonance
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Question 28 : A device uses a 8 bit word then the maximum number of words it can transmit is ________
1. 64
2. 256
3. 1024
4. 512
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Question 29 : Measured on the ground, the field strength of a horizontally polarized half wave dipole antenna is strongest ________
1. in one direction
2. in two directions
3. depends on the number of elements
4. depends on the shape of antenna
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Question 30 : What is the other name for half-wave dipole antenna?
1. Helical antenna
2. Isotropic antenna
3. Hertz antenna
4. Maxwell antenna
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