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Antenna Question & Answers

June 5, 2021 By WatElectronics

This article lists 100 Antenna  MCQs for engineering students. All the Antenna  Questions & Answers given below includes solution and link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on the Antenna topic which is core in Electrical Engineering.

An antenna is a metallic device, built by Heinrich Hertz in the year 1888. Its main function is to perform the transmission and reception process of electromagnetic radio waves between a transmitter and a receiver. The transmitter of the antenna converts an electrical signal into electromagnetic signal form and this EM signal propagates in a medium like air or vacuum to the receiver end of the antenna, where at the receiver end the antenna converts the EM wave back to an electrical signal.

Antennas are classified into many types based on their structure like wire type antenna, aperture type antenna, classification based in types of frequency like very low or high-frequency type antenna, microwave antenna, etc, function, capacity, dimensions, classification based on directions like an omnidirectional antenna radiates power in a single direction, a vertical antenna radiates vertically, etc.

Some of the advantages of the antenna are it increases the strength of the signal, minimizes the usage of power, and provides high gain. Antennas are used in every small or big electronic device or gadget like TV, radios, mobile phones, etc.

1). Transmitting antenna has which of the following parameter as a basic requirement.

Hint
2). Which of the following is the function of the antenna?

Hint
3). At what condition does wave radiates?

Hint
4). The characteristics of an antenna's radiation pattern can be represented in ________ number of ways.

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5). Which of the following is the correct statement for isotropic radiation?

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6). Isotropic radiation is also known as ________.

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7). What is the shape of isotropic radiation when observed in 3D?

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8). What is the shape of isotropic radiation when observed in 2D?

Hint
9). What is the gain factor of an isotropic radiator in all directions?

Hint
10). What is the gain factor (in dB) of an isotropic radiator in all directions?

Hint
11). EIRP in an isotropic antenna stands for _________.

Hint
12). Which of the following statement is true related to EIRP?

Hint
13). If the angle of radiation is focused at a direction this will _____ the EIRP with the gain of an antenna.

Hint
14). Which of the following is an equation for ERP of an isotropic antenna?

Hint
15). Radiation is plotted graphically in terms of _______.

Hint
16). Radiation patterns can be represented in terms of _______ types.

Hint
17). Which of the following statement is true for field patterns?

Hint
18). Which of the following statement is true for power patterns?

Hint
19). A 2-D radiation pattern graph contains how many coordinates?

Hint
20). Which of the following statement is true related to the major lobe?

Hint
21). A 3-dimensional radiation pattern graph contains how many coordinates?

Hint
22). Which of the following statement is true related to the minor lobe?

Hint
23). Which of the following statement is true related to the back lobe?

Hint
24). Which of the following statement is true related to pencil beam pattern?

Hint
25). Which of the following statement is true related to fan beam pattern?

Hint

Antenna MCQs with Answers

26). Which of the following statement is true related to shaped beam pattern?

Hint
27). How many ways a beam pattern can be represented in isotropic radiation?

Hint
28). An isotropic radiation is __________.

Hint
29). Which of the following is the example of an isotropic radiator?

Hint
30). Which of the following is the condition for beam area?

Hint
31). Which of the following is the correct statement of beam angle?

Hint
32). Which of the following is the unit of beam area?

Hint
33). Beam efficiency is the ratio between main beam area and _______.

Hint
34). Beam efficiency is termed as ___________.

Hint
35). Beam efficiency is mathematically expressed as ________.

Hint
36). Antenna can be polarized in __________ ways.

Hint
37). On polarizing an antenna which of the following parameters are decided.

Hint
38). Which of the following is true regarding linear polarization?

Hint
39). In a linear polarization which of the following parameter relies on the same plane.

Hint
40). Which of the following is true regarding circular polarization?

Hint
41). Which field vector in circular polarization, is rotated with respect to all coordinated losing orientation?

Hint
42). An example of circular polarization is _______.

Hint
43). Which of the following is true regarding horizontal polarization?

Hint
44). Which of the following is the frequency of horizontal polarization?

Hint
45). Which of the following is an example of horizontal polarization?

Hint
46). Horizontal polarization, makes the wave _______ due to reflection of the wave from the earth surface.

Hint
47). An example of the vertically polarized wave is ________.

Hint
48). Beam width is defined as __________.

Hint
49). Which of the following parameters are chosen in beam width?

Hint
50). In a Half power beam width HPBW radiation pattern is decreased by ______ % from the main peak beam?

Hint

Antenna Exam Questions & Answers

51). Half power beam width HPBW is mathematically expressed as ________.

Hint
52). Half power beam width HPBW is expressed in terms of _______.

Hint
53). First null beam width FNBW is the angle between ________.

Hint
54). What is the formula of first null beam width?

Hint
55). FNBW is expressed in terms of _______.

Hint
56). Effective length of antenna is used to find ______ parameter of antenna.

Hint
57). Effective length of receiving antenna is defined as the ratio between _______.

Hint
58). Effective area of receiving antenna is defined as ______.

Hint
59). The effective area of an antenna is defined as _______.

Hint
60). If antenna properties do not change with the operation it is a ______ property.

Hint
61). Which of the following are trans-receiver reciprocity properties?

Hint
62). Antennas use which type of energy wave to communicate information.

Hint
63). An electromagnetic wave are graphically represented between _____ and _____.

Hint
64). An electromagnetic wave has how many fields _______.

Hint
65). Electric field in EM wave is plotted on ______ axis.

Hint
66). Magnetic field in EM wave is plotted on ______ axis.

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67). Which of the following vector states about EM wave energy per unit time per unit area at any time?

Hint
68). Poynting vector was derived by ____ in _____ year.

Hint
69). Units of Poynting vector is ________.

Hint
70). Instantaneous Poynting vector is mathematically expressed as _______.

Hint
71). Units of Electric field intensity is _______.

Hint
72). Units of magnetic field intensity is _______.

Hint
73). Which of the following statement is true in the Poynting vector regarding EM wave?

Hint
74). On which of the antennas of the following base are classified.

Hint
75). Which of the following are the examples of a wire antenna?

Hint

Antenna Interview Questions & Answers

76). Which of the following are the applications of wire antenna?

Hint
77). Which of the following are the examples of aperture antennas?

Hint
78). Which of the following are the applications of aperture antenna?

Hint
79). Which of the following are the examples of reflector antenna?

Hint
80). Which of the following are the applications of reflector antenna?

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81). Which of the following are the applications of lens antenna?

Hint
82). Which of the following are the examples of lens antenna?

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83). Which of the following are the applications of microstrip antenna?

Hint
84). Which of the following are the examples of microstrip antenna?

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85). Which of the following is the application of array antenna?

Hint
86). Which of the following are the examples of array antenna?

Hint
87). Half wave dipole antenna is also called as ________.

Hint
88). What is the range of frequency in which a dipole antenna operates?

Hint
89). Which of the following are the advantages of a half wave dipole?

Hint
90). Which of the following is the disadvantage of a full wave dipole antenna?

Hint
91). What is the range of frequency in a short dipole antenna that operates?

Hint
92). If the wavelength is bigger than the length of dipole then it is termed as a type of ______ dipole.

Hint
93). What is the radiation pattern of a short dipole in 2D?

Hint
94). Which of the following are the disadvantages of a short dipole antenna?

Hint
95). Which of the following are the types of long wire antenna?

Hint
96). Resonant antenna is _________ in nature.

Hint
97). Non-Resonant antenna is ________ in nature.

Hint
98). Long-wire antennas are used as basic elements in _______ antennas.

Hint
99). What is the range of frequency in a V-shaped antenna that operates?

Hint
100). What is the range of frequency in an inverted V-shaped antenna that operates?

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101). A 3-dimensional radiation pattern graph contains how many coordinates?

Hint
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