The antenna effective height is ____ to ____ of the actual height. A. ½ to 2/3 B. ½ to ¾ C. ¼ to 2/3 D. ¼ to ¾

The antenna effective height is ____ to ____ of the actual height.
A. ½ to 2/3
B. ½ to ¾
C. ¼ to 2/3
D. ¼ to ¾
by

1 Answer

Answer :

A. ½ to 2/3
by

Related questions

What is the usual electrical length of a driven element in an HF beam antenna? A. ¼ wavelength B. ¾ wavelength C. ½ wavelength D. 1 wavelength

Description : What is the usual electrical length of a driven element in an HF beam antenna? A. ¼ wavelength B. ¾ wavelength C. ½ wavelength D. 1 wavelength

Last Answer : C. ½ wavelength

ECE Board Exam March 1996 SSB transmission requires only ______ of the bandwidth for a DSBFC transmission. A. ¼ B. 2/3 C. ½ D. ¾

Description : ECE Board Exam March 1996 SSB transmission requires only ______ of the bandwidth for a DSBFC transmission. A. ¼ B. 2/3 C. ½ D. ¾

Last Answer : C. ½

The sewers A. Must be of adequate size to avoid over flow B. Must flow under gravity ½ to ¾ full C. Must be laid at least 2 to 3 m deep to collect /water from the basements D. All the above

Description : The sewers A. Must be of adequate size to avoid over flow B. Must flow under gravity ½ to ¾ full C. Must be laid at least 2 to 3 m deep to collect /water from the basements D. All the above

Last Answer : ANS: D

What is the value for centrifugal torque for maximum power transmission in belt drives a) ½ maximum torque b) 2/3 maximum torque c) ¾ maximum torque d) None of the above

Description : What is the value for centrifugal torque for maximum power transmission in belt drives a) ½ maximum torque b) 2/3 maximum torque c) ¾ maximum torque d) None of the above

Last Answer : d) None of the above

Actual height of antenna should be at least A. one wavelength B. half wavelength C. quarter wavelength D. three-fourth wavelength

Description : Actual height of antenna should be at least A. one wavelength B. half wavelength C. quarter wavelength D. three-fourth wavelength

Last Answer : C. quarter wavelength

Which of the following is not a valid size of a Floppy Disk? A) 8? B) 5 ¼? C) 3 ½? D) 5 ½?

Description : Which of the following is not a valid size of a Floppy Disk? A) 8? B) 5 ¼? C) 3 ½? D) 5 ½?

Last Answer : Answer : D

Accuracy of elevation of various points obtained from contour map is limited to (A) ½ of the contour interval (B) ¼ th of the contour interval (C) rd of the contour interval (D) th of the contour interval

Description : Accuracy of elevation of various points obtained from contour map is limited to (A) ½ of the contour interval (B) ¼ th of the contour interval (C) rd of the contour interval (D) th of the contour interval

Last Answer : (A) ½ of the contour interval

If the focal spot to film distance is increased from 20cm to 40cm, the intensity of radiation is reduced by: a. ½ b. ¼ . c. 1/3 d. 1/5

Description : If the focal spot to film distance is increased from 20cm to 40cm, the intensity of radiation is reduced by: a. ½ b. ¼ . c. 1/3 d. 1/5

Last Answer : b. ¼ .

If the focal spot to film distance is increased from 20cm to 40cm, the intensity of radiation is reduced by: A. ½ B. ¼ C. 1/3 D. 1/5

Description : If the focal spot to film distance is increased from 20cm to 40cm, the intensity of radiation is reduced by: A. ½ B. ¼ C. 1/3 D. 1/5

Last Answer : B. ¼

Oxadiazon has a half life of 60 days, so after 120 days the concentration will be a). ½ b). ¼ c). 1/3 d). 1/5

Description : Oxadiazon has a half life of 60 days, so after 120 days the concentration will be a). ½ b). ¼ c). 1/3 d). 1/5

Last Answer : b). ¼

The product of the radiated RF power of a transmitter and the gain of the antenna system in a given direction relative to an isotropic radiator is called ____. A. Effective Radiated Power (ERP) B. Effective Isotropic Radiated Power (EIRP) C. Radiated Power D. Transmit Power

Description : The product of the radiated RF power of a transmitter and the gain of the antenna system in a given direction relative to an isotropic radiator is called ____. A. Effective Radiated Power (ERP) B. Effective Isotropic Radiated Power (EIRP) C. Radiated Power D. Transmit Power

Last Answer : B. Effective Isotropic Radiated Power (EIRP)

Top loading is used in an antenna in order to increase its ______. A. practical height B. beamwidth C. effective height D. input capacitance

Description : Top loading is used in an antenna in order to increase its ______. A. practical height B. beamwidth C. effective height D. input capacitance

Last Answer : C. effective height

Top loading is used in an antenna in order to increase its ___________. A. input capacitance B. beamwidth C. bandwidth D. effective height

Description : Top loading is used in an antenna in order to increase its ___________. A. input capacitance B. beamwidth C. bandwidth D. effective height

Last Answer : D. effective height

What height of an ionized layer is determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence? A. Virtual height B. Apparent height C. Actual height D. Effective height

Description : What height of an ionized layer is determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence? A. Virtual height B. Apparent height C. Actual height D. Effective height

Last Answer : A. Virtual height

In the case if Marconi antenna, the actual length if the radiating element is A. one-half wavelength B. one-quarter wavelength C. one wavelength D. one-eight wavelength

Description : In the case if Marconi antenna, the actual length if the radiating element is A. one-half wavelength B. one-quarter wavelength C. one wavelength D. one-eight wavelength

Last Answer : B. one-quarter wavelength

The typical length of the rhombic antenna is ____. A. 2λ to 8λ B. 10λ to 20λ C. 1λ to 3λ D. 5λ to 10λ

Description : The typical length of the rhombic antenna is ____. A. 2λ to 8λ B. 10λ to 20λ C. 1λ to 3λ D. 5λ to 10λ

Last Answer : A. 2λ to 8λ

An ungrounded antenna near the ground A. acts as a single antenna of twice the height B. is unlikely to need an earth mat C. acts as antenna array D. must be horizontally polarized

Description : An ungrounded antenna near the ground A. acts as a single antenna of twice the height B. is unlikely to need an earth mat C. acts as antenna array D. must be horizontally polarized

Last Answer : C. acts as antenna array

Factors that determine the radiation resistance of an antenna A. Transmission line length and height of antenna B. The location of the antenna with respect to nearby objects C. It is a constant for all antennas since it is physical D. Sunspot activity and the time of day

Description : Factors that determine the radiation resistance of an antenna A. Transmission line length and height of antenna B. The location of the antenna with respect to nearby objects C. It is a constant for all antennas since it is physical D. Sunspot activity and the time of day

Last Answer : B. The location of the antenna with respect to nearby objects

For a space wave transmission, the radio horizon distance of a receiving antenna with a height of 64 meters is approximately A. 8 km B. 32 km C. 64 km D. 256 km

Description : For a space wave transmission, the radio horizon distance of a receiving antenna with a height of 64 meters is approximately A. 8 km B. 32 km C. 64 km D. 256 km

Last Answer : B. 32 km

The angle of elevation of the antenna beam is 20°. Calculate the transmission-path distance for an ionospheric transmission that utilizes a layer of virtual height 200 km. Use flat-earth approximation. A. 966 km B. 2100 km C. 1100 km D. 405 km

Description : The angle of elevation of the antenna beam is 20°. Calculate the transmission-path distance for an ionospheric transmission that utilizes a layer of virtual height 200 km. Use flat-earth approximation. A. 966 km B. 2100 km C. 1100 km D. 405 km

Last Answer : C. 1100 km

A receiver is located 64 km from a space wave transmitting antenna that is 100 meters high. Find the required height of the receiving antenna. A. 36 meters high B. 64 meters high C. 100 meters high D. 182.25 meters high

Description : A receiver is located 64 km from a space wave transmitting antenna that is 100 meters high. Find the required height of the receiving antenna. A. 36 meters high B. 64 meters high C. 100 meters high D. 182.25 meters high

Last Answer : A. 36 meters high

For a space wave transmission, the radio horizon distance of a transmitting antenna with a height of 100 meters is approximately:A. 10 km B. 40 km C. 100 km D. 400 km

Description : For a space wave transmission, the radio horizon distance of a transmitting antenna with a height of 100 meters is approximately: A. 10 km B. 40 km C. 100 km D. 400 km

Last Answer : B. 40 km

One of the following prevents a transmitter from emitting a signal that interferes with other stations on frequency during the test. A. Use of low height antenna B. Use of grounded antenna C. Use of dummy antenna D. Use of shielded antenna radiator

Description : One of the following prevents a transmitter from emitting a signal that interferes with other stations on frequency during the test. A. Use of low height antenna B. Use of grounded antenna C. Use of dummy antenna D. Use of shielded antenna radiator

Last Answer : C. Use of dummy antenna

The advantage of periscope antenna in microwave A. Minimize interference to and from other neighboring stations B. Shorten waveguide link C. Reduce tower height D. All of these

Description : The advantage of periscope antenna in microwave A. Minimize interference to and from other neighboring stations B. Shorten waveguide link C. Reduce tower height D. All of these

Last Answer : B. Shorten waveguide link

An antenna “efficiency” is computed by using one of the following equations. A. Efficiency = (radiation resistance / transmission resistance) B. Efficiency = (total resistance / radiation resistance) x 100% C. Efficiency = (effective radiated power / transmitter output) x 100% D. Efficiency = (radiation resistance / total resistance) x 100%

Description : An antenna efficiency is computed by using one of the following equations. A. Efficiency = (radiation resistance / transmission resistance) B. Efficiency = (total resistance / radiation resistance) x ... / transmitter output) x 100% D. Efficiency = (radiation resistance / total resistance) x 100%

Last Answer : D. Efficiency = (radiation resistance / total resistance) x 100%

For a shortened vertical antenna, where should a loading coil be placed to minimize losses and produce the most effective performance? A. As low as possible on the vertical radiator B. Near the center of the vertical radiator C. As close to the transmitter as possible D. At a voltage node

Description : For a shortened vertical antenna, where should a loading coil be placed to minimize losses and produce the most effective performance? A. As low as possible on the vertical radiator B. Near the center of the vertical radiator C. As close to the transmitter as possible D. At a voltage node

Last Answer : B. Near the center of the vertical radiator

The power fed to a two-bay turnstile antenna is 100 watts. If the antenna has a 2 dB power gain, what is the effective radiated power? A. 317 watts B. 158 watts C. 200 watts D. 400 watts

Description : The power fed to a two-bay turnstile antenna is 100 watts. If the antenna has a 2 dB power gain, what is the effective radiated power? A. 317 watts B. 158 watts C. 200 watts D. 400 watts

Last Answer : B. 158 watts

If an antenna is too short for the wavelength being used, the effective length can be increased by adding: A. capacitance in series B. inductance in series C. resistance in parallel D. resistance in series

Description : If an antenna is too short for the wavelength being used, the effective length can be increased by adding: A. capacitance in series B. inductance in series C. resistance in parallel D. resistance in series

Last Answer : B. inductance in series

What is the effective radiated power of a repeater with 200 watts transmitter power output, 4 dB feline loss, 4 dB duplexer and circulator loss, and 10 dB antenna gain? A. 317 W B. 2000 W C. 126 W D. 260 W

Description : What is the effective radiated power of a repeater with 200 watts transmitter power output, 4 dB feline loss, 4 dB duplexer and circulator loss, and 10 dB antenna gain? A. 317 W B. 2000 W C. 126 W D. 260 W

Last Answer : A. 317 W

What is the effective radiated power of a repeater with 120 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 6 dB antenna gain? A. 601 W B. 240 W C. 60 W D. 379 W

Description : What is the effective radiated power of a repeater with 120 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 6 dB antenna gain? A. 601 W B. 240 W C. 60 W D. 379 W

Last Answer : C. 60 W

What is the effective radiated power of a repeater with 100 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 10 dB antenna gain? A. 800 W B. 126 W C. 12.5 W D. 1260 W

Description : What is the effective radiated power of a repeater with 100 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 10 dB antenna gain? A. 800 W B. 126 W C. 12.5 W D. 1260 W

Last Answer : B. 126 W

What is the effective radiated power of a repeater with 75 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 6 dB antenna gain? A. 37.6 W B. 237 W C. 150 W D. 23.7 W

Description : What is the effective radiated power of a repeater with 75 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 6 dB antenna gain? A. 37.6 W B. 237 W C. 150 W D. 23.7 W

Last Answer : A. 37.6 W

What is the effective radiated power of a repeater with 75 watts transmitter power output, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 10 dB antenna gain? A. 600 W B. 75 W C. 18.75 W D. 150 W

Description : What is the effective radiated power of a repeater with 75 watts transmitter power output, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 10 dB antenna gain? A. 600 W B. 75 W C. 18.75 W D. 150 W

Last Answer : D. 150 W

What is the effective radiated power of a repeater with 50 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 7 dB antenna gain? A. 300 W B. 315 W C. 31.5 W D. 69.9 W

Description : What is the effective radiated power of a repeater with 50 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 7 dB antenna gain? A. 300 W B. 315 W C. 31.5 W D. 69.9 W

Last Answer : C. 31.5 W

What is the effective radiated power of a repeater with 50 watts transmitter power output \, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 6 dB antenna gain? A. 158 W B. 39.7 W C. 251 W D. 69.9 W

Description : What is the effective radiated power of a repeater with 50 watts transmitter power output \, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 6 dB antenna gain? A. 158 W B. 39.7 W C. 251 W D. 69.9 W

Last Answer : B. 39.7 W

Which frequency reuse method is less effective because of Faraday’s effect? A. Dual polarization B. Reducing antenna beamwidth C. Zonal rotation D. Spin stabilization

Description : Which frequency reuse method is less effective because of Faraday’s effect? A. Dual polarization B. Reducing antenna beamwidth C. Zonal rotation D. Spin stabilization

Last Answer : A. Dual polarization

The product of antenna input power and the antenna power gain expressed in kW is called __. A. Effective Radiated Power (ERP) B. Effective Isotropic Radiated Power (EIRP) C. Radiated Power D. Transmit Power

Description : The product of antenna input power and the antenna power gain expressed in kW is called __. A. Effective Radiated Power (ERP) B. Effective Isotropic Radiated Power (EIRP) C. Radiated Power D. Transmit Power

Last Answer : A. Effective Radiated Power (ERP)

What is the term for the ration of the radiation resistance of an antenna to the total resistance of the system? A. Effective radiated power B. Beamwidth C. Radiation conversion loss D. Antenna efficiency

Description : What is the term for the ration of the radiation resistance of an antenna to the total resistance of the system? A. Effective radiated power B. Beamwidth C. Radiation conversion loss D. Antenna efficiency

Last Answer : D. Antenna efficiency

Determine the effective radiated power of 20 kW TV broadcast transmitter whose antenna has a field gain of 2. A. 40 kW B. 80,000 watts C. 40,000 watts D. 8,000 watts

Description : Determine the effective radiated power of 20 kW TV broadcast transmitter whose antenna has a field gain of 2. A. 40 kW B. 80,000 watts C. 40,000 watts D. 8,000 watts

Last Answer : B. 80,000 watts

What is meant by the term antenna efficiency? A. Efficiency = effective radiated power/transmitter output x 100% B. Efficiency = radiation resistance/ transmission resistance C. Efficiency = total resistance/radiation resistance x 100% D. Efficiency = radiation resistance/total resistance x 100%

Description : What is meant by the term antenna efficiency? A. Efficiency = effective radiated power/transmitter output x 100% B. Efficiency = radiation resistance/ transmission resistance C. Efficiency = total resistance/radiation resistance x 100% D. Efficiency = radiation resistance/total resistance x 100%

Last Answer : D. Efficiency = radiation resistance/total resistance x 100%

An increase in the effective power radiated by an antenna in a certain desired direction at the expense of power radiated in other directions. A. Antenna gain B. Antenna back lobe ration C. Antenna total ration D. Antenna efficiency

Description : An increase in the effective power radiated by an antenna in a certain desired direction at the expense of power radiated in other directions. A. Antenna gain B. Antenna back lobe ration C. Antenna total ration D. Antenna efficiency

Last Answer : A. Antenna gain

Rose budded at 3 ½ feet height is called a. Miniature rose b. Standard rose c. Half standard rose d. Climbing rose

Description : Rose budded at 3 ½ feet height is called a. Miniature rose b. Standard rose c. Half standard rose d. Climbing rose

Last Answer : Standard rose

The area of a plane triangle ABC, having its base AC and perpendicular height , is (A) ½ bh (B) ½ ba sin C (C) ½ bc sin A (D) All the above

Description : The area of a plane triangle ABC, having its base AC and perpendicular height , is  (A) ½ bh (B) ½ ba sin C (C) ½ bc sin A (D) All the above

Last Answer : (D) All the above

The coefficients of permeability of soils of an unconfined aquifer and another confined aquifer were determined by pumping water from the wells and observing the effect of water table in two test wells at equal distances was found to be equal. The total height of confined aquifer H is given by (A) H = h2 - h1 (B) H = h1 - h2 (C) H = h2 + h1 (D) ½ (h1 + h2)

Description : The coefficients of permeability of soils of an unconfined aquifer and another confined aquifer were determined by pumping water from the wells and observing the effect of water table in two test wells at equal distances was found to be equal. ... (B) H = h1 - h2 (C) H = h2 + h1 (D) ½ (h1 + h2)

Last Answer : Answer: Option D

If B is the width of formation, d is the height of the embankment, side slope S : 1, for a highway with no transverse slope, the area of cross-section is (A) B + d + Sd (B) Bd + Sd2 (C) B × d - Sd1/2 (D) ½ (Bd + Sd2

Description : If B is the width of formation, d is the height of the embankment, side slope S : 1, for a highway with no transverse slope, the area of cross-section is (A) B + d + Sd (B) Bd + Sd2 (C) B × d - Sd1/2 (D) ½ (Bd + Sd2

Last Answer : (B) Bd + Sd2

To prevent segregation the concrete should to be thrown from a height of more than. (a) ½ m (b) 1m (c) 1.5m (d) 2m

Description : To prevent segregation the concrete should to be thrown from a height of more than. (a) ½ m (b) 1m (c) 1.5m (d) 2m

Last Answer : (b) 1m

Top loadingissometimesusedwithan antenna in ordertoincrease its a. effective height b. bandwidth c. beamwidth d. input capacitance

Description : Top loadingissometimesusedwithan antenna in ordertoincrease its a. effective height b. bandwidth c. beamwidth d. input capacitance

Last Answer : a. effective height

A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is (A) bn (fc /2) (d - n/3) (B) Atft (d - n/3) (C) ½ n1 (1 - n1/3) cbd² (D) All the above

Description : A singly reinforced beam has breadth b, effective depth d, depth of neutral axis n and critical neutral axis n1. If fc and ft are permissible compressive and tensile stresses, the moment to resistance of the beam, is (A) bn (fc ... (B) Atft (d - n/3) (C) ½ n1 (1 - n1/3) cbd² (D) All the above

Last Answer : Answer: Option D

¾ of 24 =?

Description : ¾ of 24 =?

Last Answer : 3/4 of 24=18

A 8 years-old patient has 3 first premolars erupted and a swelling on the ridge of the un-erupted premolar. X ray shows a fully developed crown and ¾ roots development with no other pathology. What is your management: A. Remove the dentigerous cyst B. Soft tissues recision to allow eruption C. Soft tissues recision accompanied with orthodontic appliance to help with eruption

Description : A 8 years-old patient has 3 first premolars erupted and a swelling on the ridge of the un-erupted premolar. X ray shows a fully developed crown and ¾ roots development with no ... recision to allow eruption C. Soft tissues recision accompanied with orthodontic appliance to help with eruption

Last Answer : C. Soft tissues recision accompanied with orthodontic appliance to help with eruption