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what is vacuum tube?
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A vacuum tube is a tube with no air particles.
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What is the value of susceptibility in case of vacuum? A) 1 B) 0.5 C) ∞ D) 0 

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What is the value of susceptibility in case of vacuum? A) 1 B) 0.5 C) ∞ D) 0 

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Relative permeability of vacuum is?

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Relative permeability of vacuum is 1.

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What is Cathode ray tube ?

Answer :

Cathode ray tube (CRT) is a vacuum tube using cathode rays to generate a picture on a fluorescent screen. These cathode rays are in fact the electron beam deflected and modulated, which impinges on a ... tube used to display data in a visual form. Picture tube of a television or computer terminal.

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Draw the wiring diagram of fluorescent tube. Explain the working of choke and starter. 

Answer :

Fluorescent lamp:- Operation:- When switch is ON current flows through the choke-filament no1- starter-filament no. 2- to neutral, At that time choke induces high voltage which is applied to ... at the time of starting. ii) Starter: To make and break the circuit to start the tube. 

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Description :

Draw the constructional detail of C type bourdon tube and explain its working. 

Answer :

Explanation : The C-shaped Bourdon tube has a hollow, elliptical cross section. It is closed at one end and is connected to the fluid pressure at the other end. When pressure is applied, ... the maximum operating pressure of the system or portion of the system in which the gauge is installed. 

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Distinguish between fire tube and water tube boilers in steam power plant.

Answer :

Fire Tube boiler Water Tube boiler In fire tube boilers hot gases are passed through the tubes and water surrounds these tubes. In these boilers water is inside the tubes and hot gases are ... risk of explosion due to low pressure. Risk of explosion is more due to high pressure.

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Description :

Draw and describe construction and working of Bourdon tube.

Answer :

Construction and working : C type bourdon tube is made up of an elliptically flattened tube bent in such a way as to produce the C' shape as shown in the figure. One end (free ... displacement can be indication of applied pressure. Accuracy of this element is higher than C' type element.

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Description :

Draw Bourdon tube with LVDT setup for pressure measurement.

Answer :

Bourdon tube with LVDT setup for pressure measurement.

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Explain the working of Neon sign tube with diagram.

Answer :

Neon sign tube: The construction & circuit diagram for neon tube is as shown in fig. Basically neon tube is used for advertisement or decoration purpose. The maximum length of tube is ... the HT transformer must be earthed separately. * Caution notice of danger board is required.

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Description :

The pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows: (A) Pressure is lower but velocity is higher (B) Pressure is higher but velocity is lower (C) Both pressure and velocity are lower (D) Pressure and velocity are identical

Answer :

The pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows: (A) Pressure is lower but ... lower (C) Both pressure and velocity are lower (D) Pressure and velocity are identical

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Description :

Which of the following was used as circuitry for first generation of computers? (1) Vacuum tube (2) Transistors (3) Integrated circuits (4) Microprocessors

Answer :

Vacuum tube

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Description :

In general AC distribution systems, arc interruption in vacuum circuit breakers are designed to function in a time period of (a) One cycle (b) Two to three cycles (c) Within ten cycles (d) None of the above

Answer :

In general AC distribution systems, arc interruption in vacuum circuit breakers are designed to function in a time period of One cycle

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Description :

is Ohms law applicable to vacuum tubes?

Answer :

Ohm's law is not applicable to vacuum tubes.

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Description :

1. Which tissue is responsible for the secondary growth? 2. By whom the salary and perquisites of the Prime Minister of India are decided? 3. What happens to the level of mercury in the barometer tube when it is taken down a coal mine? 4. Mac Mohan Line demarcates the boundary between which countries? 5. ... to resign addresses his letter of resignation to whom? 19. Which river basin is called Ruhr of India'? 20. During which ruler were Upanishads translated into Persian?

Answer :

Answer : 1. Cambium 2. Parliament 3. It rises 4. India and China 5. Krishna Deva Raya 6. Generation 7. Dehradun 8. Collenchyma 9. Konkan coast 10. Iltutmish 11. The Ministry is dissolved 12. ... 14. Tapti 15. Aurangzeb 16. Jagdish Bhagwati 17. Hypothalmus 18. The President 19. Damodar 20. Shah Jahan

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Description :

A tube can fill a tank completely in 18 hours. After half the tank is filled , one more similar tube is opened. What is the total time taken to fill the tank completely ? A) 14hrs 20min B) 13hrs 30min C) 13hrs 10min D) 14hrs 30min

Answer :

C A tube can fill the half tank in 9hrs Now another similar tube opened 1/18+1/18 = 2/18 = 1/9 Remaining half tank filled in 4.5hrs Total time = 9+4.5 =13.5 = 13hrs 30min

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Description :

A tube can fill a cistern in 18hrs.After half the cistern is filled, three more similar tubes are opened. What is the total time taken to fill the cistern completely ? A) 9hrs 52min B) 10hrs 15 min C) 9hrs 45 min D) 10hrs 30min

Answer :

D Time taken to fill the half cistern = 18/2 = 9 hrs Remaining part = 1/2 Time taken to fill the remaining part = [1/(4×1/12)] ×(1/2) = 3/2hrs 3/2 hrs = 90 min = 1hr 30mints Total time = 9hrs+90 min = 10hrs 30mins

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Description :

Explain with neat diagram working of Mc Leod gauge used for vacuum measurement.

Answer :

Mc Leod gauge:  Working: To operate the gauge, the piston is first withdrawn, causing the level of mercury in the lower part of the gauge to fall below the level of the junction between the two tubes. ... the fluid.  The expression for calculating the unknown pressure is Diagram: 

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Description :

Fifth generation computers do not have : (1) Speech recognition (2) Artificial intelligence (3) Very large scale integration (4) Vacuum tubes 

Answer :

Vacuum tubes

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Description :

These waves cannot be transmitted through vacuum (1) Light (2) Sound (3) Heat (4) Electromagnetic

Answer :

Sound

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A vacuum cleaner works on the principle of pressure difference. On the moon it will (1) work as efficiently as on the earth (2) not work at all (3) work with reduced efficiency (4) work with increased efficiency

Answer :

 not work at all

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Among the following materials sound travels fastest in (1) Steel (2) Air (3) Vacuum (4) Water

Answer :

Steel

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A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ? (1) They must have the same volume (2) They must have the same density (3) They must have the same mass (4) They must be dropped in vacuum

Answer :

They must be dropped in vacuum

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Sound cannot pass through (1) water (2) steel (3) air (4) vacuum

Answer :

vacuum

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Longitudinal waves cannot travel through (1) Vacuum (2) Solid (3) Liquid (4) Gas

Answer :

Vacuum

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The velocity of heat radiation in vacuum is (1) Equal to that of light (2) Less than that of light (3) Greater than that of light (4) Equal to that of sound

Answer :

Equal to that of light

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Write two advantages and two disadvantages of vacuum dewatered concrete floor.

Answer :

Advantages of vacuum de-watered concrete floor: i. It reduces the time for finishing the floor. ii. Smooth and clean finish surface. iii. It reduce permeability and increase durability of concrete floor ... . iv. Joint can also weaken the concrete. v. Abrasion can cause dust and cleanliness problem.

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Define the following special types of concretes with its one use. i) Vacuum concrete ii) Fiber reinforced concrete iii) High performance concrete iv) Self-compacting concrete

Answer :

The uses of special types of concretes are as follows.  i) Vacuum concrete: It is the concrete in which entrained air and excess water form concrete mix is taken out from vacuum pump, ... . large bridge and machine foundations iii. Pumped concrete for floors and slabs. iv. Pre-stressed concrete

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Write down specification and applications of Air blast C. B. and Vacuum C. B.

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Specifications of Circuit Breaker: i) Service type: Indoor / Outdoor ii) No. of Poles: 1 or 3 iii) Nominal System Voltage: iv) Highest System Voltage: v) Rated normal current; vi) ... Vacuum Circuit Breaker: Vacuum circuit breakers are used in electrical systems operating at 11kV, 25kV and 33kV.

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Explain vacuum impregnation method used for Re-varnishing of insulation with neat diagram.

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Figure of process of vaccum impregnation:-  Explain the process of vacuum impregnation:- The plant consists of: 1. A large air tight chamber (VIC) i.e. processing or impregnation chamber. 2 ... )curing temperature varies from 90°C to 110°C for 10-20 minutes in some cases one to two hours.

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Description :

Give comparison of Bourdon tube and Diaphragm.

Answer :

Bourdon tube Diaphragm. Gear drive connects dial reading No gears inside the diaphragm pressure gauge Increased gap between gear and arm affect accuracy  Shock resistant and good ... time and money Large range of pressure measurement Small range of pressure measurement

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Explain the production of X-ray’s using Coolidge tube. 

Answer :

Principle: When fast moving electrons are suddenly stopped then X- rays are produced.  Production: 1. When the cathode is heated by electric current it produced electron due to thermionic emissions ... filament current, penetrating power of X-ray depends on P.D. between cathode and anode. 

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Voltage required to operate a neon-sign tube depends upon

Answer :

Voltage required to operate a neon-sign tube depends upon length of the tube

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Description :

The purpose of connecting a capacitor in fluorescent tube circuit is • To increase switching on time • To decrease switching off time • To increase power factor • To decrease power consumption

Answer :

The purpose of connecting a capacitor in fluorescent tube circuit is To increase power factor

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The purpose of a choke in a fluorescent tube is (A) To decrease the current (B) To increase the current (C) To decrease the voltage momentarily (D) To increase the voltage momentarily

Answer :

The purpose of a choke in a fluorescent tube is To increase the voltage momentarily

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The vapour discharge tube used for domestic lighting has (1) No filament (2) One filament (3) Two filament (4) Three filament 

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Which of the following is present inside the fluorescent tube (1) Argon and neon (2) Argon and co2 (3) Mercury vapour (4) Helium and oxygen 

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In a Traveling-wave Tube, the velocity of electron beam with respect to the axial velocity of RF field is kept...  A) Lower B) Higher C) Equal D) Any of these

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TUBE-DWELLING ANEMONE (Pachycerianthus fimbriatus)

Answer :

TUBE-DWELLING ANEMONE (Pachycerianthus fimbriatus) Habitat: Sandy bottom areas from Alaska to Baja California Size: 30 cm (12 in) Position in food web: Carnivorous suspension feeder: Feeds on ... visible light giving them a fluorescent orange color. Relatives: Sea jellies, corals, and sea fans

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All beans are excellent sources of protein, fiber, and good sources of manganese, magnesium, iron, zinc, and potassium. They are also a source of folate, a B vitamin that reduces the risk of neural tube defects in infants. They are fat free and cholesterol free.

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The Morgan's Sphinx Moth from Madagascar has a proboscis (tube mouth) that is 12 to 14 inches long to get the nectar from the bottom of a 12 inch deep orchid discovered by Charles Darwin.

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In surface condensers write role of (i) Water tubes (ii) Shell (iii) Baffle plate (iv) Tube sheet

Answer :

Function of parts in surface condensers 1. Water tubes- Cooling water flows through it , for convective heat transfer to occur with steam outside the tubes 2. Shell- Outer body, all components are ... and improves heat transfer 4. Tube sheet- All tubes are supported at the end in tube sheet

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Compare orifice plate with venturi tube with reference to: (i) Working principle (ii) Construction (iii) Cost (iv) Pressure loss

Answer :

Venturi Flow Meter vs Orifice Plate Meter

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Description :

Draw constructional details of C-types Bourdon tube and explain its working

Answer :

Constructional details of C-types Bourdon tube :   Explanation:- 1. The Bourdon tubes are made out of an elliptically sectioned flat tube bent in such a way as to produce the above ... pressure. 8. The materials used for Bourdon tubes are brass, phosphor bronze, beryllium copper, and steel 

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Description :

Compare U tube manometer and well type manometer

Answer :

U-tube and well type manometer Sr.No. U-tube manometer well type manometer 1 Both legs are having same cross section area Both legs are having different cross section area ... cross section area. 5 Difference in heights in measured. Single height is measured.

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Description :

Tamilnadu coastal belt has drinking water shortage due to: (A) high evaporation (B) sea water flooding due to tsunami (C) over exploitation of ground water by tube wells (D) seepage of sea water

Answer :

Answer: D  With increasing exploitation of ground water, seepage of seawater into the earth takes place, reducing sea water level. Coastal environment plays a vital role in nation's economy by virtue ... coastal length of India and stretches along the Bay of Bengal, Indian Ocean and Arabian Sea.

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1. The oldest monarchy in the world is that of which country? 2. Starch iodide paper is used to test for the presence of which agent? 3. In the case of a test-tube baby' where does fertilisation take place? 4. The direction of ocean currents is reversed with season in which ocean? 5. By which inscription is the ... 18. What is formed by dissolution of base or acid in water? 19. Which is the smallest Union Territory? 20. In which year was India was invaded by Timur Lame?

Answer :

Answer : 1. Japan 2. Oxidising agent 3. Outside the mother's body 4. In the Indian Ocean 5. The Satavahanas 6. 324 7. Khurja 8. 38th Parallel 9. North-West Atlantic 10. Hala 11. ... urbanisation15. Amir Khusrau 16. Prithvi Raj Kapoor 17. According to value 18. Exothermic 19. Lakshadweep 20. 1398

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Description :

Draw the diagram of Fusion Splice and rigid alignment tube splice. 

Answer :

Different types of splicing are: 1. Fusion splicing or welding 2. Mechanical splicing 3. Elastic tube splicing FUSION SPLICING: A fiber join is a type of wield. The fiber ends ... figure below is a unique device that automatically performs lateral, longitudinal and angular alignment. 

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