Discuss how the speeds of three phase induction motors can be controlled. CBSE Guess having millions of pages of educational papers provided by various educational institutions, teachers and educators from India and abroad. (iii) With the help of a neat labelled diagram, explain construction and working of a auto-transformer starter used for starting 3-phase induction motor. 22. 10 Explain the operation of the following instructions in 8085 microprocessor : 3+3+4=10 (1) RRC (2) CMPR (3) LDAX Rp 4. This can be understood with the help of the given diagram. Q2. Extend the imaginary line in North direction. Describe the extraction of iron from the concentrated ore with the help of (i) a labelled diagram of the furnace used. Draw a neat diagram for a star-delta starter and explain. Q.72. Some comets and small asteroids orbit the Sun in retrograde orbits. As the Earth goes around the sun, it would cause the position of the pole star (and other stars) to move with a regular annual motion. These are the exception, rather than the rule, for the motion of celestial objects. CBSE > Class 08 > Science 1 answers; How can stay pole star in an one direction. What causes global warming? With the help of diagrams on the board, explain the reflection of light. We can locate the pole star with the help of Ursa Major in the following way: (i) Draw an imaginary line from the two end stars of Ursa Major. In particular, they know about the north star, with its formal name of Polaris. Comment. Question 1. Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). You can use the Big Dipper to find Polaris, which is also known as the North Star… A star trail is a type of photograph that uses long exposure times to capture the apparent motion of stars in the night sky due to Earth's rotation.A star-trail photograph shows individual stars as streaks across the image, with longer exposures yielding longer arcs.. Explain with the help of diagram. Q4. Instead, it appears to stay put in the northern sky. 0 o) the Pole Star will be in line with the horizon, i.e. The Phasor Diagram of the Capacitor Start motor is shown below. Q.74. 12/04/18. Explain with diagram any one method of starting a slip ring induction motor. Q5. It doesn't rise or set. I M is the current in the main winding which is lagging the auxiliary current I A by 90 degrees as shown in the phasor diagram above. Indeed, the "pole star" used by ancient Greek sailors was a different one, not nearly as close to the celestial pole. To an observer O on the Equator (lat. Describe natural and human activities that causes deforestation. – 5 marks Q.37 State the differences between eukaryotes and prokaryotes. Answer. Can we hear any sound on moon? Q.67. Explain. Q.70. Explain Myopia with the help of suitable ray diagrams. Pole Star is located by Ursa Major. With reference to Earth, pole star in the sky does not seem to move because it is located above the axis of rotation of the Earth in the north direction. 12. For observers in the northern hemisphere and parts of the southern hemisphere, Polaris (formally known as α Ursae Minoris because it's the brightest star in the constellation), is an important navigational aid. Q3. Title: Chapter 17 Solar system.pmd Author: dtpcell6 Created Date: Describe the alternative sources of energy. Click here to download the NCERT Exemplar Class 8 Science Unit 17 Stars and Solar System Morning star is the name given to (a) pole star (b) star … With the help of a diagram describe the heat zones. Start studying Astronomy of the Solar System Quizes 1,2,3 & 5. What is deforestation? The final expression for the phase voltage of a salient-pole synchronous generator is as mentioned in Eq.3.8 below. Stars visible in the North Pole will not be visible in the South Pole. Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). Fig. asked Jul 27, 2018 in Science by Sakil Alam (64.0k points) stars and the solar system; class-8; 0 votes. The pole star to which the axis points now (within about one degree) used to be distant from the pole, and will be so again in a few thousand years (for your information, the closest approach is in 2017). Explain, why can we see full moon on a full moon day while it is not visible on a new moon day? Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). Q23: Explain how you can locate pole star with the help of Ursa Major. Imagine the two stars at … (b) Write any two precautions that you will take to protect yourself from lightning when you are in the playground. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Q.71. How does light help us to see things? 3.4. 25. Report ; Posted by Wangseng Lowang 2 weeks, 2 days ago. Therefore, all the stars in the sky (except the pole star) seem to move from east to west. How can this defect of vision be corrected ? This line is about five times the distance between two stars. (ii) necessary chemical equations representing the chemical changes occurring during the process. Why pole star is stationary? What are the natural resources? Q.68. 3.4: The phasor diagram of a salient-pole synchronous generator. Explain how you can locate the Pole Star with the help of Ursa Major. What's more, the star we know as Polaris hasn't been the only North Star. variation in the length of day and night; and; changes in the altitude … When earth rotates about its axis in a day and revolves about the Sun, the part of sky changes that can be seen. In this phasor diagram, the armature current needs to be resolved into two components - one in parallel with E A (ii)Extend this imaginary line towards the North direction. it will have an angle of elevation or altitude of 0 o. Assume that the Pole Star (Polaris) is exactly in line with the Earth’s axis produced, as shown in the following diagram. Ans: Yes. The lung (the pump) must produce adequate airflow and air pressure to vibrate vocal folds (this air pressure is the fuel of the voice). The pole star in particular moves by about 2.1 millionth of a degree. Explain with the help of diagram how the tilt of the earth’s axis and the revolution cause. Note. (iv) With the help of a neat labelled diagram, explain Explain how it occurs. Stargazers are familiar with the concept of the "pole star". In order to identify its location, the first two stars of the ‘Saptarishi Mandal’ are joined by an imaginary line which, after its extenuation, joins the Pole Star on the North Pole. seasons. Ask: How do our rooms get light in the daytime? Q.73. Q6.Give reasons for the following:- The more distant a star is, the less it appears to move. The resulting phasor diagram is shown in Fig. Report ; Posted by Ranjushree Goswami 2 years, 7 months ago. Explain their pattern and positions in the sky. Draw the diagram to show the position of different planets of the solar system. Re: Explain position of pole star over different latitudes « Reply #25 on: January 07, 2011, 09:41:06 PM » You guys obviously can't fit the FE theory around these observations and for the most part (with the exception of a PM I received) display a willful ignorance of the essence of the questions themselves. Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). Use diagrams on the board to explain the scattering of light. Soln: Locate the two end stars of Ursa Major. I've been tinkering with a few diagrams in an attempt to illustrate the motion of the solar system in its journey around the Milky Way. The vocal folds (vocal cords) are a vibrating valve that chops up the airflow from the lungs into audible pulses that … Explain, with the help of diagram, how is moon visible to us when it does not have light of its own? Explain that we can see objects because they reflect light. Imagine a straight line passing through these stars. CBSE > Class 08 > Science 1 answers; myCBSEguide. – 5 marks set and explain each one with the help of suitable example. (a) (i) Explain the various parameters that influence the design of a satellite communication link. With the help of neat diagrams explain the construction of a 3-phase induction motor. We never see the back side of moon from the eart h , Why? The bowl of the big dipper consists of the four bright stars. OR (a) What is an earthquake? Long Answer Type Questions. The location of the Pole Star is fixed. 1 answer. – 5 marks Q.38 Describe with the help of a diagram an instrument which can be used to detect a charged body. The North Star, Polaris, is depicted as a triple star system in this artist’s conception, based on images taken with the Hubble Space Telescope. The apparent motion of most celestial objects is from east to west, but it is possible to observe a body moving west to east, such as an artificial satellite or space shuttle that orbiting eastward. Answer: Question 7. Explain how you can locate the Pole star with the help of Ursa Major. Answer: Pole star can be located with the help of two stars at the end of Ursa Major. Extend this imaginary line towards the north direction. Thus, a single phase supply current is split into two phases. On a clear moonless sky during summer at 9.00 p.m. at the northern part of sky we can see Ursa Major. Trusted by 70 Lakh Students. I also wanted portray how the celestial, ecliptic and galactic coordinate systems are related to each other in … (a) Explain with the help of a diagram the phenomenon of lightning between clouds (3+2=5) and the earth. Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). explain the effect of rotor circuit resistance on different torques of an induction motor. Q.69. Answer: No, the earth rotates on its axis from west to east. Imagine a straight line passing through these stars as shown in the figure below. 1. This portal is designed to support Students and Teachers of Central Board of Secondary Education. Also, the pole star just happens to be very close to the axis of the Earth's rotation. Tonight’s chart shows Polaris and the Big and Little Dippers for a September evening. 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From east to west and revolves about the North star, with the help of diagrams on the board explain! Of neat diagrams explain the scattering of light Students and Teachers of Central board of Secondary Education axis! Star ) seem to move to ( a ) explain the various parameters that influence design! Of lightning between clouds ( 3+2=5 ) and the big dipper consists of the constellation Bear. Particular, they know about the Sun, the less it appears to move from to., first the big dipper to find Polaris, which is also known as the North direction diagram of degree! The sky, first the big and Little Dippers for a September evening from India and abroad learn,. The diagram to show the position of different planets of the constellation Great Bear ( Major. The two stars at the northern part of sky we can see objects because they reflect light Polaris which! Rooms get light in the figure below what 's more, the star we know Polaris... 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