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7.37 An NRZ data stream of amplitude levels +1 is passed through a low-pass filter whose impulse response is defined by the Gaussian function h(t) = exp where a is a design parameter defined in terms of the filter's 3dB bandwidth by In 21 a = 2 W a. Show that the transfer function of the filter is defined by H(f) = exp(-a?f?) Hence, demonstrate that the 3dB bandwidth of the filter is indeed equal to W. You may use the list of Fourier-transform pairs in Table 2.1. b. Determine the response of the filter to a rectangular pulse of unit amplitude and duration T centered on the origin.

 

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7.37 An NRZ data stream of amplitude levels +1 is passed through a low-pass filter whose impulse response is defined by the G


Answer:


h(t)= t exp 21 dh (+) dt -curt htt) =-257thit) x2 txa dhe j Applying Fourier transform to both sides yields. jzof HWO) = x 29Gco) Shordat het omdat we know that 2 da=1 ob Glo) si -urt e ardt put - 202 a Come =) Lake To L=52 cm ra t² e gardt 20 Et adtif y . T PCf) T - 1 ] [l-ejentit] p(1) b pet) e sentif T 1. ejenftit jaaf -) -jatifT e 1 j24 jzuf jarif jauf Filter Responge

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Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Step 2 Step 3
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QUESTION 6 (a) The bar shown in Figure Q2(a) is subjected to tensile load of 150 Kn. If the stress in the middle portions is limited to 160 N/mm², determine the diameter of the middle portion. Find also the length of the middle portion if the total elongation of the bar is to be 0.25 mm. E E = 2.0 + 105N/mm². (12 marks) 150 KN 10 cm DIA 10 cm DIA 150 KN 45 cm Figure Q6(a) (b) A brass bar, having cross-section area of 900 mm², is subjected to axial forces as shown in Figure Q2(b), in which AB = 0.6 m, BC = 0.8 m, and CD = 1.0 m. Find the total elongation of the bar. E = 1.0 + 105N/mm2 . (8 marks) Page 4 of 5 B D 40 KN 70 KN 20 KN 10 KN Figure Q6(b) (TOTAL = 20 MARKS)

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