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What makes an electromagnet stronger than a solenoid?

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Description : What are three ways you can increase the strength of an electromagnet?

Description : What happens when you reverse the direction of the current in an electromagnet?

Answer : When  you  reverse  current  direction  in  an  electromagnet,  the magnetic  poles  will  also  change.

Description : What is permanent magnet and electromagnet?

Answer : Permanent magnet: A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. As the name suggests, a permanent magnet is 'permanent'. ... an electric current passes through the coil. If the current is interrupted, the magnetism is lost.

Description : What will be the value of the current (in Ampere) in a 40 cm long solenoid in a free space, if it has 400 turns, 2 cm of diameter and produces a magnetic field of 4mT at its center

Description : State any two applications of electromagnet.

Answer : Applications of Electromagnet: Cranes, Motors, Generators, Transformers, Electromagnetic Relays, Circuit breakers, Traction, Measuring instruments, Electrical Bell etc.

Description : Explain the principle of operation of solenoid. State two parameters on which selection of solenoid is based.

Answer : Diagram : Principle: A solenoid is a simple electromagnetic device that converts electrical energy directly into linear mechanical motion, but it has a very short stroke (length of movement), ... Parameters on which selection of solenoid is based1. Size 2. Flow capacity 3. Applied Voltage

Description : Every trial endured and weathered in the right spirit makes a soul nobler and stronger than it was before. - James Buckham quote

Description : Solenoid is a specially designed ________ A. Actuator B. Machine C. Electromagnet D. none of above

Answer : C. Electromagnet  

Description : In protolytic reactions in which the reactants are much stronger as an acid and a base than the products, the proton transfer reaction: w) does not occur x) approaches completeness y) produces a much stronger acid and a much weaker base z) produces a much weaker acid and a much stronger base

Answer : ANSWER: X -- APPROACHES COMPLETENESS

Description : Bone is stronger than some steel. This doesn't mean your bones can't break of course, as they are much less dense than steel. Bone has been found to have a tensile strength of 20,000 psi while ... ,000 psi. Steel is much heavier than bone, however, and pound for pound bone is the stronger material.

Description : Select the ‘False’ statement from the following statements about Normal Forms: (A) Lossless preserving decomposition into 3NF is always possible (B) Lossless preserving decomposition into BCNF is always possible (C) Any relation with two attributes is in BCNF (D) BCNF is stronger than 3NF

Answer : (B) Lossless preserving decomposition into BCNF is always possible

Description : 1. What is most suitable for the core of an electromagnet? 2. What is common between Kutty, Shankar, Laxman and Sudhir Dar? 3. On which bast is the India's wage policy? 4. Which is east of ... 19. Ankaleshwar and Navagaon are two oil fields in which state? 20. What was the capital of Hoyasals?

Answer : Answer : 1. Soft iron 2. Drawing Cartoons 3. Cost of living 4. Indonesia 5. Ali Brothers 6. Sand fly 7. 12 8. Lime stone 9. Padma 10. Khan Abdul Ghaffar Khan 11. Journalism 12. ... Bhikaiji Cama 16. 6 months 17. It forms erect, reduced images 18. Increasing steadily 19. Gujarat 20. Dwarasamudra

Description : The internal rate of return (1) must be less than the interest rate if the firm is to invest. (2) makes the present value of profits equal to the present value of costs. (3) falls as the annual yield of an investment rises. (4) is equal to the market interest rate for all the firm’s investment. 

Answer : falls as the annual yield of an investment rises.

Description : What is solenoid valve ? Explain its working with the help of diagram.

Answer : Solenoid valve is an electromagnetic valve used to control flow of fluid such as air or oil. It consists of a solenoid assembly and valve assembly. When current passes through solenoid, the ... remains closed. Solenoid valves are used in hydraulic and pneumatic circuits to regulate air/oil flow. 

Description : What is the energy stored in the magnetic field at a solenoid of 40 cm long and 4 cm diameter wound with 100 turns of wire carrying a current at 20A?  (A) 0.705 Joule (B) 0.789 Joule (C) 0.587 Joule (D) 0.658 Joule 

Description : Select the code which is not correct :  An analogical argument is strengthened by (A) increasing the number of entities. (B) increasing the number of similar respects. (C) reducing the claim made earlier stronger. (D) making the conclusion stronger when premises remain unchanged.

Answer : (D) making the conclusion stronger when premises remain unchanged. 

Answer : Core of an electromagnet should have low coercivity, high susceptibility.

Description : What kind of stuff makes work more difficult than necessary?

Description : Write one application of each: i) Permanent Magnet ii) Electromagnet 

Answer : i) Applications of Permanent Magnet: 1) Field of DC motors 2) Tacho-generators 3) In stepper motors. 4) Field of two wheeler and car dynamo 5) In magnetic therapy 6) ... Motors, Generators, Transformers, Electromagnetic Relays, Circuit breakers, Traction, Measuring instruments, Electrical Bell etc.

Description : What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these

Answer : What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these

Description : Draw the symbol and state the applications of : 1) Push button switch 2) Selector switch 3) Solenoid valve 4) Limit switch

Answer : 1) Push Button  It is used in start-stop control circuit 2) Selector Switch : It is used to select one input out of many,  3) Solenoid valve: is used to control flow of fluid such as air, pressurized oil.  4) Limit switch: It is used to detect presence of object

Description : A beam of light is incident on a perfectly smooth body of water. The angle that the REFLECTED ray makes with the normal is: w) greater than x) smaller than y) the same as the angle the incident ray makes with the normal.

Answer : ANSWER: Y -- THE SAME AS

Description : Your brain uses 20% of the oxygen that enters your bloodstream. The brain only makes up about 2% of our body mass, yet consumes more oxygen than any other organ in the body, making it ... related to oxygen deprivation. So breathe deep to keep your brain happy and swimming in oxygenated cells. 

Description : If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450W is connected to it, the meter constant in revolutions per kWh is  A) 1000 B) 500 C) 1600 D) 800

Description : An energy meter has a constant of 600 rev/kWh. If the meter makes 10 revolutions in 20 s, what is the load in kW?  (A) 0.75 kW (B) 1.5 kW (C) 3 kW (D) 6 kW 

Answer : 1.5 kW 

Description : Good timber does not grow with ease. The stronger the wind the stronger the trees. -Williard Marriott famous quote

Description : The effects of World War-II upon education are noticeable in the form of strong tendency to Options: A) Make the schools stronger supports for national policy B) Improve the articulation between high ... college C) Reverse the trend toward increased technology training D) Answer 'A' and 'B' only

Answer : D) Answer 'A' and 'B' only

Description : According to Henry David Thoreau, the reason a majority is allowed to rule is not that it is more likely to be right, but because it is stronger. (A) the reason a majority is allowed to rule is not ... (E) the reason why the majority rules is that it is strong, not because it is likely to be right 

Description : Hind limbs thumping on ground by a rabbit is a behaviour related to (1) Courtship (2) Preparation for a duet (3) Warning signal to members (4) Surrender ot a stronger opponent

Answer : Warning signal to members

Description : Electromagnet is constructed with which of the following ? (1) Steel (2) Soft Iron (3) Aluminium (4) Nickel

Answer : Soft Iron

Description : Composition is a stronger form of which of the following?  (1) Aggregation (2) Encapsulation (3) Inheritance (4) All of the above. 

Answer : Atrraction  capacity  will  increase  if  supply  current  is  increased.

Description : What makes an ecosystem ? (1) A living community and its environment (2) All the plants and animals of an area (3) Carnivores and herbivores of an area (4) Producers, consumers and decomposers in a particular locality 

Answer : A living community and its environment

Description : An alloy of Iron - Chromium and Nickel makes what

Answer : Stainless Steel

Description : ____ is used latching, locking, triggering. A. Solenoid B. Relay C. Linear Actuator D. Servo motors

Answer : A. Solenoid 

Description : Explain operation of solenoid valve with neat diagram.

Answer : Operation: A solenoid valve is the combination of a basic solenoid and mechanical valve. So a solenoid valve has two parts namely- Electrical solenoid, mechanical valve. Solenoid ... coil, the emf is dissipated allowing internal spring return the valve stem to the original position 

Description : Explain solenoid valve with construction and working of it.

Answer : Solenoid valve  Construction: A solenoid valve consists of an electromagnetic coil and a valve. The electromagnetic coil actuates an armature or a valve stem in a magnetic field to control ... on-off switching option in the system and are actuated by electric signals from remote locations. 

Description : State the working principle of solenoid valve with neat sketch

Answer : Principle of Operation: * A solenoid is used for translating ON/OFF electrical signals to ON/OFF mechanical movements and normally used as a linear actuator. * As shown in fig (b) above, ... * When the voltage is applied to the solenoid frame magnetic field is produced in the solenoid frame. 

Description : The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is  (A) 3.2 µH (B) 3.2 mH (C) 32.0 mH (D) 3.2 H

Answer : The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is 32.0 mH

Answer : Main causes of noisy solenoid are strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force, uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts.

Description : What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Answer : What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Description : At any time we may describe the position of an inferior planet by the angle it makes with the sun as seen from the earth. This angle is called the: w) ecliptic (pron: eh-klip-tik) x) epicycle y) elongation z) proxima

Answer : ANSWER: Y -- ELONGATION

Description : A pessimist is one who makes difficulties of his opportunities and an optimist is one who makes opportunities of his difficulties. - Harry Truman, American President (b. 1884) Motivational quote

Description : When a teacher ensures that students complete an exercise in mathematics and makes sure instructions are clear and specific. The teacher ensures the ........ aspect of assessment Options: A) A Validity B) Practicality C) Reliability D) Wash-back effect

Answer : A) A Validity 

Description : The Right to Information Act, 2005 makes the provision of (A) Dissemination of all types of information by all Public authorities to any pe rson. (B) Establishment of Central, State and District ... an appellate body. (C) Transparency and accountability in Public authorities. (D) All of the above

Answer : (D) All of the above

Description : Internal economies (1) arise when there is expansion in an industry. (2) arise in an economy as it makes progress. (3) accrue to a firm when it expands its output. (4) arise when there is expansion in internal trade.

Answer : arise when there is expansion in an industry.

Description : Which of the following rivers flows from East to West and makes an estuary? (1) Yamuna (2) Krishna (3) Narmada (4) Godavari

Answer : Narmada

Description : Which of the following rivers makes an estuary? (1) Cauvery (2) Krishna (3) Narmada (4) Ganga

Answer : Narmada

Answer : An 8 bit converter type A/D converter makes at least 8000conversions/sec. The clock frequency used is 2MHz.

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