test2_versionA_detailed

test2_versionA_detailed - McGill University Faculty of...

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. Mc Fa Name: Student Date: INSTRU This Only The t quest Each You w The q There No ad Duri autom Please cGill Univ culty of E ID: ____ 12 TH UCTIONS: is a CLOSE the FACUL test consists tion. Please s question is will get zero questions ma efore, please dditional inf ng this test, matically le e do not t versity ngineerin ________ November ED BOOK t LTY STAND of sixteen m select the rig worth 5 poin o for any una ay be compl e use your tim formation wi , any discus ad to zero s turn to th g 2008 est. DARD CAL multiple-choi ght answers. nts. You wil answered qu eted in any o me wisely. ill be provid sions with o scores for al he next p 1 ECSE 3 FALL 2 Time LCULATOR ice-questions l lose 1 poin uestion. order. Some ed during th other studen ll parties inv page unti a 352: Electro 2008, CLAS e: 15:35 R may be us s. Five choic nts for each w questions m he test. nts are cons volved. l you are omagnetic W SS TEST 2 – 16:25 (50 sed. ces are provi wrong choic ay be easier idered chea e instruct aves minutes) ided for each e. r than others ating and wi ted to do h s. ill so.
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2 1. A wave is incident from region 1 to region 2. The standing wave ratio in region 1 is found to be 2.4. Which of the following statements are true? BD A) The reflection coefficient is 0.41. B) The fraction of power transmitted to region 2 is 83%. C) The fraction of power reflected is 59%. D) The fraction of power reflected is 17%. E) The fraction of power transmitted to region 2 is 41%. The magnitude of the reflection coefficient is 0.41, but the reflection coefficient may be complex. So A is not right. The fraction of power reflected is 0.41^2, and the fraction of power transmitted is 1-0.41^2. So B and D are right. 2. You need to make an antireflection coating on a substrate which has an impedance of 4 Ohms, where the incident medium has an impedance of 9 Ohms. Which statement represents the correct conditions for the impedance and thickness of the coating layer? CD A) Impedance=36 Ohms, Thickness=1/4 wavelength in vacuum B) Impedance=6 Ohms, Thickness=1/2 wavelength in vacuum C) Impedance=6 Ohms, Thickness=3/4 wavelength in coating D) Impedance=6 Ohms, Thickness=1/4 wavelength in coating E) Impedance=6 Ohms, Thickness=1/8 wavelength in coating The coating thickness for zero reflection needs to be (2m+1) λ /4, so C and D are right. 3. Which of the following statements are true for wave impedance of plane electromagnetic waves, considering the presence of reflections? A A) The wave impedance is defined as the ratio of electric field strength to magnetic field strength at any point B) The wave impedance is defined as the square root of permeability divided by permittivity C) The wave impedance is defined as the ratio of voltage to current at any point D) The wave impedance is the sum of the squares of the impedances of the incident and reflected medium E) The wave impedance is real in a lossless medium. B is the definition for intrinsic impedance but not for wave impedance. C applies to transmission
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This note was uploaded on 02/14/2011 for the course ECSE 352 taught by Professor Mi during the Fall '10 term at McGill.

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test2_versionA_detailed - McGill University Faculty of...

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