Description : How does a waveguide-type lens focus spherical wavefront microwave energy?
Last Answer : Some wavefronts are accelerated so that all wavefronts exit the lens at the same time
Description : A parabolic reflector changes a spherical wavefront to what type of wavefront?
Last Answer : Plane.
Description : “Each point on a spherical wavefront may be considered a source of secondary spherical wavefronts”. This is known as the A. Snell’s law B. D’Alembert’s principle C. Appleton’s theory D. Huygen’s principle
Last Answer : D. Huygen’s principle
Description : Zoningis usedwith adielectric antenna inorderto a. reduce the bulk of the lense b. increase the bandwidth of the lens c. increase pin-point focusing d. correct the curvature of the wavefront from a horn that is too short
Last Answer : a. reduce the bulk of the lense
Description : Rotating the plane of polarization of a wavefront by passing it through a ferrite device is called what?
Last Answer : . Faraday rotation.
Description : in a directional coupler that is designed to sample the incident energy, what happens to the two portions of the wavefront when they arrive at the pickup probe?
Last Answer : The wavefront portions add.
Description : When a wavefront is radiated into a waveguide, what happens to the portions of the wavefront that do not satisfy the boundary conditions?
Last Answer : Decrease to zero.
Description : A wavefront undergoes a phase change as it travels along the fiber. If the wavefront transverses the fiber twice and is reflected twice and the total phase change is equal to 1/2 p, will the wavefront disappear? If yes, why?
Last Answer : Yes, the wavefront will disappear because the total amount of phase collected must be an integer multiple of 2 p. (If the propagating wavefronts are out of phase, they will disappear. ... interfere with the wavefronts out of phase. This type of interference is called destructive interference.)
Description : When ball having a projectile motion is rising up, it A. decelerates B. accelerates C. rises up with constant acceleration D. acceleration becomes zero
Last Answer : decelerates
Description : In our present society, where values are deteriorating, the excellent education will be which (a) Enables one to earn in an easy manner (b) Exaggerates the competition in the society. (c) Works for re-establishment of human and cultural values. (d) Decelerates the social-change in the society
Last Answer : c) Works for re-establishment of human and cultural values.
Description : If a car is traveling at 20 meters per second in a straight line, how many seconds will it take the car to stop if it decelerates at 5 meters per second squared?
Last Answer : ANSWER: 4 SECONDS
Description : A car is moving along a straight horizontal road at a speed of 20 meters per second. The brakes are applied and a constant force of 5000 Newtons decelerates the car to a stop in 10 seconds. The mass of the car is: w) 1250 kilograms x) 2500 kilograms y) 5000 kilograms z) 10,000 kilograms
Last Answer : ANSWER: X -- 2500 KILOGRAMS
Description : 4. A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be -Physics-10
Last Answer : (a) Both are likely to be concave.
Description : During accommodation for near: a. the spherical aberration of the eye increases b. the ciliary muscle relaxes c. the field of vision decreases d. the amount of light entering the eye increases e. the thickness of the lens increases
Last Answer : the thickness of the lens increases
Description : With respect to lens development: a. the lens first appears at 27 days of gestation b. it is formed from neural crest cells c. the lens first appears as a vesicles with a single layer of ... d. Y suture is absent in the embryonic nucleus e. the adult lens is more spherical than the foetal
Last Answer : the lens first appears at 27 days of gestation
Description : A lens or combination of lenses in which the following defect is completely eliminated is called aplanatic (A) Spherical aberration (B) Chromatic aberration (C) Coma (D) Astigmatism
Last Answer : (A) Spherical aberration
Description : The defect of a lens whereby rays of white light proceeding from a point get dispersed into their components and conveyed to various foci, forming a blurred and coloured image is known as (A) Chromatic aberration (B) Spherical aberration (C) Astigmatism (D) Coma
Last Answer : (A) Chromatic aberration
Description : Pick up the correct statement from the following: (A) Spherical aberration may be reduced by diminishing the aperture (B) Spherical aberration may be minimised by replacing the single lens by a ... telescope objectives, a combination of convex lens and concave lens is used (D) All the above
Last Answer : (D) All the above
Description : When microwave energy is passed through a piece of ferrite in a magnetic field, another effect occurs. If the frequency of the microwave energy is much greater than the electron wobble frequency, the plane of polarization of the wavefront is rotated. This is known as
Last Answer : Faraday Rotation Effect
Description : Whose principle or law states that each point on a wavefront may be considered a new wave source? Is it: w) Snell's Law x) Huygen's Principle y) Young's Law z) Hertz's Law.
Last Answer : ANSWER: X -- HUYGEN'S PRINCIPLE
Description : Magnetron tuning by altering the surface-to-volume ratio of the hole portion of a hole-and-slot cavity is what type of tuning?
Last Answer : Inductive.
Description : Which portion of a sine-wave input is retained in the output of a series-negative limiter?
Last Answer : Positive.
Description : Which portion of a sine-wave input is retained in the output of a series-positive limiter?
Last Answer : Negative.
Description : In the subtract mode, a 1 at C0 performs what portion of the R’s complemen
Last Answer : Add 1 portion.
Description : In the subtract mode, which portion of the problem is complemented?
Last Answer : Subtrahend.
Description : At what portion of the magnetization curve should a magnetic amplifier be operated?
Last Answer : . The knee of the curve.
Description : If a wire passes through a connector what portion of the aircraft wire identification number changes?
Last Answer : Wire segment letter.
Description : What portion of an electron gun causes the electrons to accelerate or decelerate?
Last Answer : The buncher grids.
Description : Vacuum tubes are designed to operate in what portion of the Ep - Ip
Last Answer : The linear portion.
Description : If one branch of a parallel network is shorted, what portion of circuit current flows through the remaining branches?
Last Answer : None.
Description : What is the effect on total resistance and total current in a circuit if a short occurs in (a) a parallel branch, and (b) in a series portion?
Last Answer : (a) Total resistance decreases, total current increases (b) Total resistance decreases, total current increases
Description : What is the effect on total resistance and total current in a circuit if an open occurs in (a) a parallel branch, and (b) in a series portion?
Last Answer : (a) Total resistance increases, total current decreases (b) Total resistance becomes infinite, total current is equal to zero
Description : Ideally, an oscilloscope presentation should cover what vertical portion of the screen?
Last Answer : At least 60% of the vertical trace.
Description : What is the purpose of a collimating lens?
Last Answer : Forces the radial segments of a wavefront into parallel paths.
Description : From the following which type of work envelope is made in jointed arm robot a.Rectangular work envelope b.Cylindrical work envelope c.Spherical or hemispherical work envelope d.C
Last Answer : b.Cylindrical work envelope
Description : From the following which type of work envelope is made in Cartesian coordinate robot. a.Square work envelope b.Spherical work envelope c.Cylindrical work envelope d.Rectangular work envelope
Last Answer : d.Rectangular work envelope
Description : The type of mirror used in the headlamps of cars is the (a) plane mirror (b) spherical convex mirror (c) spherical concave mirror (d) parabolic concave mirror
Last Answer : Ans:(d)
Description : The type of mirrors used in the headlamp of cars is – (1) Parabolic concave (2) Plane (3) Spherical convex (4) Cylindrical concave
Last Answer : (1) Parabolic concave Explanation: Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light ... is not too close to the mirror. A real image is formed at the point of convergence.
Description : For motion of spherical particles in a stationary fluid, the drag coefficient in hindered settling compared to that in free settling is (A) More (B) Less (C) Equal (D) More or less, depending on the type of particle
Last Answer : (A) More
Description : Pick up the incorrect statement from the following: (A) The flow in strainer type wells is radial (B) The flow in cavity type wells in spherical (C) In strainer type wells, area of flow ... pipe (D) In cavity type wells, area of flow depends upon the size of the cavity
Last Answer : (C) In strainer type wells, area of flow depends upon the length of the strainer pipe
Description : The type of aggregates of same nominal size, which contain less voids when compacted, are (A) Rounded spherical (B) Irregular (C) Flaky (D) None of these
Last Answer : Answer: Option A
Description : From the following which type of work envelope is made in jointed arm robot. (A) Rectangular work envelope (B) Cylindrical work envelope (C) Spherical or hemispherical work envelope (D) None of the above
Last Answer : C
Description : From the following which type of work envelope is made in Cartesian coordinate robot. (A) Square work envelope (B) Spherical work envelope (C) Cylindrical work envelope (D) Rectangular work envelope
Last Answer : D
Description : The type of mirrors used in the headlamp of cars is (1) parabolic concave (2) plane (3) spherical convex (4) cylindrical concave
Last Answer : parabolic concave