Sometimes microwave signals follow the earth’s curvature. This due to

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Sometimes microwave signals follow the earth’s curvature. This due to Ducting.

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Waveguide are used mainly for microwave signals because

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Description : In reciprocal levelling, the error which is not completely eliminated, is due to  (A) Earth's curvature  (B) Non-adjustment of line of collimation  (C) Refraction  (D) Non-adjustment of the bubble tube 

Last Answer : (C) Refraction 

The curvature of the earth's surface, is taken into account only if the extent of survey is more than (A) 100 sq km (B) 160 sq km (C) 200 sq km (D) 260 sq km

Description : The curvature of the earth's surface, is taken into account only if the extent of survey is more than (A) 100 sq km (B) 160 sq km (C) 200 sq km (D) 260 sq km

Last Answer : (D) 260 sq km

Band loss is ∙ a. A reduction in transmitter power caused by earth’s surface curvature ∙ b. A reduction in strength of the signal caused by folded dipole bends ∙ c. An attenuation increase caused by bends radiating from the side of the fiber ∙ d. All of these

Description : Band loss is ∙ a. A reduction in transmitter power caused by earth’s surface curvature ∙ b. A reduction in strength of the signal caused by folded dipole bends ∙ c. An attenuation increase caused by bends radiating from the side of the fiber ∙ d. All of these

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Microwave transmits signals through open space like radio signal. -Technology

Description : Microwave transmits signals through open space like radio signal. -Technology

Last Answer : TrueIt supports long distance communication through space like radio signal

In RF and microwave system, what instrument is used to measure the incidental and reflected signals?

Description : In RF and microwave system, what instrument is used to measure the incidental and reflected signals?

Last Answer : reflectometer

Which of the following device is used for coupling microwave energy?

Description : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna

Last Answer : A

Which of the following is a negative-resistance microwave device for oscillator applications?

Description :  Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

Last Answer :  Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

In a microwave magic-T, E plane and H plane are

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Last Answer : In a microwave magic-T, E plane and H plane are Isolated 

Which of the following noise must be considered at high frequencies (microwave frequencies)?

Description : Which of the following noise must be considered at high frequencies (microwave frequencies)? (1) Shot noise (2) Random noise (3) Impulse noise (4) Transit time noise

Last Answer : Which of the following noise must be considered at high frequencies (microwave frequencies)? (1) Shot noise (2) Random noise (3) Impulse noise (4) Transit time noise

In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?

Description : In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?  (1) To increase the sensitivity of measurement (2) To transmit the signal to a far-off place (3) To study amplitude modulation (4) Because crystal detector fails at microwave frequencies

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Microwave links are preferred for TV transmission because?

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Antenna commonly used for microwave links are

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if the media cover an issue and it gets a powerful response from the public, the media sometimes follow up by covering that response. what is the most likely outcome of these events?

Description : if the media cover an issue and it gets a powerful response from the public, the media sometimes follow up by covering that response. what is the most likely outcome of these events?

Last Answer : Changes to public policy on the issue

Different cultures sometimes vary in their attitudes to time. In cultures where people follow event time: A. It is important to turn up for meetings on time. B. Much time is devoted to having a chat over a coffee during the working day. C. People get irritated if meetings do not start on time. D. Where an event is running over time, people do not wait for it to finish before moving on to the next event.

Description : Different cultures sometimes vary in their attitudes to time. In cultures where people follow event time: A. It is important to turn up for meetings on time. B. Much time is devoted to having a chat ... running over time, people do not wait for it to finish before moving on to the next event.

Last Answer : Much time is devoted to having a chat over a coffee during the working day.

Different cultures sometimes vary in their attitudes to time. In cultures where people follow event time: A. It is important to turn up for meetings on time. B. Much time is devoted to having a chat over a coffee during the working day. C. People get irritated if meetings do not start on time. D. Where an event is running over time, people do not wait for it to finish before moving on to the next event.

Description : Different cultures sometimes vary in their attitudes to time. In cultures where people follow event time: A. It is important to turn up for meetings on time. B. Much time is devoted to having a chat ... running over time, people do not wait for it to finish before moving on to the next event.

Last Answer : Much time is devoted to having a chat over a coffee during the working day.

A product is a price leader when: A)it is sold at the highest possible price. B)an increase in price leads to increased revenue C)it sometimes is sold at less than cost in the hope that sales of other products will increase. D)its price leads the industry and competitors follow with similar prices.

Description : A product is a price leader when: A)it is sold at the highest possible price. B)an increase in price leads to increased revenue C)it sometimes is sold at less than cost in the hope that sales of other products will increase. D)its price leads the industry and competitors follow with similar prices.

Last Answer : C)it sometimes is sold at less than cost in the hope that sales of other products will increase. D)its price leads the industry and competitors follow with similar prices.

Wahl factor to account for direct shear stress and stress concentration due to curvature for helical springs is given by, (A) (4C - 1/4C - 4) + 0.615/C (B) (4C - 1/4C + 4) + 0.615/C (C) (4C + 1/4C - 4) + 0.615/C (D) (4C + 1/4C + 4) + 0.615/C

Description : Wahl factor to account for direct shear stress and stress concentration due to curvature for helical springs is given by, (A) (4C - 1/4C - 4) + 0.615/C (B) (4C - 1/4C + 4) + 0.615/C (C) (4C + 1/4C - 4) + 0.615/C (D) (4C + 1/4C + 4) + 0.615/C

Last Answer : (A) (4C - 1/4C - 4) + 0.615/C

Pick up the incorrect statement from the following. The super-elevation on roads is (A) Directly proportional to width of pavement (B) Directly proportional to velocity of vehicles (C) Inversely proportional to acceleration due to gravity (D) Inversely proportional to the radius of curvature

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Curvature of PPF is due to……… (a) Increase in opportunity cost ; (b) Decrease in opportunity cost ; (c) Fall in demand; (d) Fall in supply

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Last Answer : (a) Increase in opportunity cost ; 

The slight curvature at the lower end of the O.C.C. of a self-excited dc generator is due to

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What causes the Moon’s phases? A. The Sun lights up only one half of the Moon and as the Moon orbits the Earth we can sometimes see the unlit side of the Moon? B. The Sun lights up only one half of the Moon and as the Sun orbits the Earth we can sometimes see the unlit side of the Moon. C. The Earth’s shadow falls on the Moon, blocking the sunlight. D. The Moon’s shadow falls on the Earth, blocking the sunlight.

Description : What causes the Moon's phases? A. The Sun lights up only one half of the Moon and as the Moon orbits the Earth we can sometimes see the unlit side of the Moon? B. The Sun lights up only ... falls on the Moon, blocking the sunlight. D. The Moon's shadow falls on the Earth, blocking the sunlight.

Last Answer : C. The Earth’s shadow falls on the Moon, blocking the sunlight.

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Description : Two sinusoidal signals having the same amplitude and frequency are applied to the X and Y inputs of a CRO. The observed Lissajous figure is straight line. The phase shift between the two signals would be (1) Zero (2) 90 degrees (3) Either zero or 180 degrees (4) Either 90 degrees or 270 degrees  

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Do cell phones cause brain cancer or other types of brain disorders due to microwave emissions?

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In synthetic curves, first-order continuity yields a.a position continuous curve b.a slope continuous curve c.a curvature continuous curve d.none of the above

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In synthetic curves, zero-order continuity yields a.a position continuous curve b.a slope continuous curve c.a curvature continuous curve d.none of the above

Description : In synthetic curves, zero-order continuity yields a.a position continuous curve b.a slope continuous curve c.a curvature continuous curve d.none of the above

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C” continuity refers to a.Common tangent b.Common curvature c.Common point d.Common normal

Description : C” continuity refers to a.Common tangent b.Common curvature c.Common point d.Common normal

Last Answer : a.Common tangent

C‘ continuity refers to a.Common tangent b.Common curvature c.Common point d.Common normal

Description : C‘ continuity refers to a.Common tangent b.Common curvature c.Common point d.Common normal

Last Answer : b.Common curvature

C0 continuity refers to a.Common tangent b.Common curvature c.Common point d.Common normal

Description : C0 continuity refers to a.Common tangent b.Common curvature c.Common point d.Common normal

Last Answer : c.Common point

In synthetic curves, second-order continuity yields a.a position continuous curve b.a slope continuous curve c.a curvature continuous curve d.none of the above

Description : In synthetic curves, second-order continuity yields a.a position continuous curve b.a slope continuous curve c.a curvature continuous curve d.none of the above

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An automobile weighing 2800 lb and travelling at 30 miles/hr, hits a depression in the road which has a radius of curvature of 50 ft. What is the total force to which springs are subjected. a.8230 lb b.6170 lb c.2800 ib d.107 dynes e.3280 lb

Description : An automobile weighing 2800 lb and travelling at 30 miles/hr, hits a depression in the road which has a radius of curvature of 50 ft. What is the total force to which springs are subjected. a.8230 lb b.6170 lb c.2800 ib d.107 dynes e.3280 lb

Last Answer : b. 6170 lb

A roller coaster reaches a velocity of 20 m/s at a location where the radius of curvature is 40 m. Calculate the acceleration in m/s2? a.10 b.9 c.11 d.8 e.107 dynes

Description : A roller coaster reaches a velocity of 20 m/s at a location where the radius of curvature is 40 m. Calculate the acceleration in m/s2? a.10 b.9 c.11 d.8 e.107 dynes

Last Answer : a. 10

When a train is rounding a curve to prevent side thrust on the wheel flanges of cars a.Opposite thrust is created to counter balance this thrust b.Guide rail sections are provided to take care of thrust c.Thrust eliminators are provided in the train d.Outside rails are realised e.Rail section is made thick on curvature

Description : When a train is rounding a curve to prevent side thrust on the wheel flanges of cars a.Opposite thrust is created to counter balance this thrust b.Guide rail sections are provided to take care of ... are provided in the train d.Outside rails are realised e.Rail section is made thick on curvature

Last Answer : d. Outside rails are realised

14. An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image. -Physics-10

Description : 14. An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image. -Physics-10

Last Answer : Object distance (u) = - 20 cm Object height (h) = 5 cm Radius of curvature (R) = 30 cm Radius of curvature = 2 Focal length R = 2f f = 15 cm According to the mirror formula, ... image height indicates that the image formed is erect. Hence, the image formed is erect, virtual, and smaller in size.

1. Find the focal length of a convex mirror whose radius of curvature is 32 cm. -Physics-10

Description : 1. Find the focal length of a convex mirror whose radius of curvature is 32 cm. -Physics-10

Last Answer : Radius of curvature (R) = 32 cm Radius of curvature = 2 × Focal length (f) R= 2f f = R/2 = 32/2 = 16 Therefore, the focal length of the given convex mirror is 16 cm.

2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length? -Physics-10

Description : 2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length? -Physics-10

Last Answer : Radius of curvature (R) = 20 cm Radius of curvature of the spherical mirror = 2 × Focal length (f) R = 2f f= R/2 = 20 / 2 = 10 Therefore, the focal length of the spherical mirror is 10 cm.

Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: (i) at the centre of curvature of a concave mirror (ii) between the pole P and focus F of a concave mirror (iii) in front of a convex mirror (iv) at 2F of a convex lens (v) in front of a concave lens -Physics

Description : Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: (i) at the centre of curvature of a concave mirror (ii) between the pole P and focus F of ... front of a convex mirror (iv) at 2F of a convex lens (v) in front of a concave lens -Physics

Last Answer : Answer. Nature of image: Real, inverted and same size image is formed at the centre of curvature. Nature of image: Virtual, enlarged and erect image is formed behind the mirror. Nature of image: Virtual ... : Virtual, erect and diminished image is formed between O and F on the same side of object.

An object is placed at a distance of 12 cm in front of a concave mirror of radius of curvature 30 cm. List four characteristics of the image formed by the mirror. -Science

Description : An object is placed at a distance of 12 cm in front of a concave mirror of radius of curvature 30 cm. List four characteristics of the image formed by the mirror. -Science

Last Answer : Here, radius of curvature of concave mirror, R = 30 cm. Therefore, focal length of the mirror, f = R/2 = 30/2 = 15 cm Also, object distance, u = 12 cm Hence, knowing the focal length of mirror and ... (i) Erect (ii) Larger in size than that of the object (iii) Virtual and (iv) Behind the mirror.

Explain why a ray of light passing through the centre of curvature of concave minor gets reflected along the same path. -Science

Description : Explain why a ray of light passing through the centre of curvature of concave minor gets reflected along the same path. -Science

Last Answer : The light falling on the centre of curvature is reflected back along the same path because incident ray falls on the mirror along the normal to the reflecting surface.

What is curvature ?

Description : What is curvature ?

Last Answer : Soil-bound plants cannot move from one place to another. And their limbs bend in many ways. This type of movement is called curvature. Examples of curvature are the movement of the stem towards the light , the dark movement of the root , the twisting of the attractive support, etc.

What is the center of curvature ?

Description : What is the center of curvature ?

Last Answer : If both sides of the lens are spherical, they will each be part of a specific sphere. The center of that sphere is called the center of curvature of that surface.

What is the center of curvature ?

Description : What is the center of curvature ?

Last Answer : The center of the sphere in which the spherical mirror is a special part is called the center of curvature of that mirror.

What is curvature ?

Description : What is curvature ?

Last Answer : : The motion that occurs in a curve is called curvature or curvilinear motion. For example , the annual motion of the earth, the motion of the chairs hanging in the vertical swing , etc.

What is the curvature radius of the lens ?

Last Answer : The radius of curvature of the lens is two.

The line joining the centre of curvature and pole of the mirror is called. ______.

Description : The line joining the centre of curvature and pole of the mirror is called. ______.

Last Answer : The line joining the centre of curvature and pole of the mirror is called. ______. A. the principal axis B. y-axis C. the centre axis D. None of these

Find the radius of curvature of √x+√y=√a

Description : Find the radius of curvature of √x+√y=√a

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The radii of curvature of each surface of a convex lens is `20 cm` and the refractive index of the material of the lens is `3//2` (i) Calculate its fo

Description : The radii of curvature of each surface of a convex lens is `20 cm` and the refractive index of the material of the lens is `3//2` (i) Calculate its fo

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