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Questions asked by radhasatyam.ysr
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38
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10. A plane electromagnetic wave in the visible region is moving along the zz direction. The frequency of the wave is 0.5×1015Hz0.5×1015Hz and the electric field at any point is varying sinusoidally with time with amplitude of 1V/m1V/m. Calculate the average values of densities of the magnetic field. Report Error
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May 18, 2016
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9. Find the average energy stored in a 60 cm length of a laser beam operating at 4mW.
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May 18, 2016
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8. What is order of energy of X-rays (EX)(EX), radio waves (ER)(ER), and micro waves (EM)(EM)?
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May 18, 2016
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7. The speed of light in air, if an electromagnetic wave is travelling in air whose dielectric constant is k=1.006k=1.006, will be :
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May 18, 2016
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6. Electromagnetic waves are transverse in nature is evident by
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May 18, 2016
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3. A TV tower has a height of 100m100m. The area covered by the TV broadcast, if radius of the earth is 6400km6400km, will be:
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May 18, 2016
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1. UHFUHF range if electromagnetic waves can be propagated by means of
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May 18, 2016
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7. An audio signal given by 20sin(2π×4000t)20sin(2π×4000t) is used for modulating carrier wave given by 40sin(2π×400000t)40sin(2π×400000t).The frequency spectrum of modulated wave
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May 18, 2016
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10. A 1KHz modulating voltage is supplied to a FM(frequency modulator) produces a frquency deviation of 1.2KHz.The modulating index is
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May 18, 2016
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9. What type of data does optical fibres carry
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May 18, 2016
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8. When microwave signals propagate along the curvature of the earth,the effect is called
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May 18, 2016
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8. When microwave signals propagate along the curvature of the earth,the effect is called
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May 18, 2016
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12. A message signal of frequency 12 kHz and peak voltage of 20 volts is used to modulate a carrier of frequency 12 MHz and peak voltage of 30 volts. Determine (a) modulation index, (b) the side bands produced and (c) bandwidth of modulated wave.
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May 18, 2016
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13. A transmitter puts out a total power of 25 Watts of 30% AM signal. Calculate how much power is contained in each of the sidebands and the fraction of power in the carrier.
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May 18, 2016
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14. A transmission tower at a particular place has a height of 150m. (A) What is its coverage range? (B) By how much should the height be increased to 1.2 times its coverage range? Given that radius of earth = 6400 km.
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May 18, 2016
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1313. When 80% AM is transmitted total power is 10kW. What is the power saved if the carrier and one side band are suppressed? 80% AM is transmitted total power is 10kW. What is the power saved if the carrier and one side band are suppressed?
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May 18, 2016
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12. If an antenna radiates electromagnetic wave from a height of h the range of coverage d is given by where R is radius of earth
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May 18, 2016
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12. If an antenna12. If an antenna radiates electromagnetic wave from a height of h the range of coverage d is given by where R is radius of earth electromagnetic wave from a height of h the range of coverage d is given by where R is radius of earth
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May 18, 2016
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11. In amplitude modulation
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May 18, 2016
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10. For commercial FM transmission maximum frequency deviation allowed
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May 18, 2016
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8. Power of carrier wave is 1000Watt.What is the required power of the signal to modulate it 100%
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May 18, 2016
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7. An audio signal 20sin(2π×400t)20sin(2π×400t) is used to modulating a carrier wave given by 40sin(2π×40000t)40sin(2π×40000t).The percentage modulation is
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May 18, 2016
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5. Bandwidth is dependent on
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May 18, 2016
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1. For television broadcasting, the frequency employed is normally
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May 18, 2016
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Which of the following will always be true
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May 17, 2016
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13. If ∣∣∣∣∣a2(a+1)2(a−1)2b2(b+1)2(b−1)2c2(c+1)2(c−1)2∣∣∣∣∣=k∣∣∣∣a2a1b2b1c2c1∣∣∣∣|a2b2c2(a+1)2(b+1)2(c+1)2(a−1)2(b−1)2(c−1)2|=k|a2b2c2abc111| then the value of kk is
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May 17, 2016
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12. If AA and BB are square matrices of equal degree,then which one is correct among the following
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May 17, 2016
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6. If A and B are symmetric matrices,then AB−BAisa_______
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May 17, 2016
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2. Compute the following [a2+b2a2+c2b2+c2a2+b2]+[2ab−2ac2bc2ab]
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May 17, 2016
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what is the solution for given matrix formula
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May 16, 2016
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4. If A′=[−2132] and B=[−1102] , then find (A+2B)′
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May 16, 2016
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4. A drug that is antipathetic as well as analgeric is
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May 16, 2016
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5. The following compound is used as
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May 16, 2016
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11. Which of the following drug acts as an antipyretic as well analgesic?
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May 16, 2016
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12. Which of the following is a triphenylmethane dye ?
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May 16, 2016
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13. Which of the following is an insecticide ?
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May 16, 2016
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3. What type of propellant was used in SLV−3SLV−3 (India)?
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May 16, 2016
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structurally leiod gradable detergent should contain
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May 16, 2016
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