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Answer.) Keplerian Telescopes 🔭. :

(a) Kepler telescope The Kepler telescope 🔭 as shown in the figure consists of two converging Lens, one is called Objective lens and another is called eyepiece Lens ....

Now it is given that ;

the object is lying in the front focal plane of the first lens

therefore,

magnification m = -fo/fe = -2

Implies , fo ( objective focal length)

= 2 • fe ( eyepiece focal length) ...

image size = m • object size

image size = -2 •5 mm = -1 cm

for normal adjustment Lenght

L = fo + fe = 3 • fe

for calculation and N.A of the objective lens ;

f 40 7 个 diffraction limited spet size (da) fo ak te Now from Ray optics, W. A (numerical Affesture) = 224 Ä« da no-500 nm da hence , the numerical aperture NA = 0.159

answer.....

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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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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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