The compound of silicon used as insulating material for electric motors/appliances is

The compound of silicon used as insulating material for electric motors/appliances is
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1 Answer

Answer :

silicone.
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Related questions

Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)? (A) Armature of small motors/generators (B) Generators and small motors (C) Induction motors (D) High frequency transformers

Description : Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysteresis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical ... /generators (B) Generators and small motors (C) Induction motors (D) High frequency transformers

Last Answer : (D) High frequency transformers

In addition to undercutting the mica, proper maintenance of a D.C. motor's commutator includes _______________. A. side-cutting the copper segments and insulating the slots B. coating the copper surface with light machine oil for the first four hours of operation C. baking the armature in an oven at a maximum of 95°C for not over 8 hours D. all of the above

Description : In addition to undercutting the mica, proper maintenance of a D.C. motor's commutator includes _______________. A. side-cutting the copper segments and insulating the slots B. coating the copper surface with light machine ... in an oven at a maximum of 95°C for not over 8 hours D. all of the above

Last Answer : Answer: A

Name the different types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Description : Name the different types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Last Answer : A: Following motors are used: - Vacuum cleaners- Universal motor. Phonographic appliances - Hysteresis motor. Vending machines - Shaded pole motor. Refrigerators - Capacitor split phase ... Cumulative motors. Lathes - DC shunt motors. Power factor improvement - Synchronous motors.

Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Description : Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines, refrigerators, rolling mills, lathes, power factor improvement and cranes.

Last Answer : Following motors are used: - Vacuum cleaners- Universal motor. Phonographic appliances - Hysteresis motor. Vending machines - Shaded pole motor. Refrigerators - Capacitor split phase ... Cumulative motors. Lathes - DC shunt motors. Power factor improvement - Synchronous motors.

Silicon percentage in the silicon steel used for electrical appliances/equipments is (A) 0.3-0.4 (B) 12-14 (C) 3-4 (D) 20-25

Description : Silicon percentage in the silicon steel used for electrical appliances/equipments is (A) 0.3-0.4 (B) 12-14 (C) 3-4 (D) 20-25

Last Answer : Option C

Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Last Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

The electric breakdown strength of insulating materials depends on

Description : The electric breakdown strength of insulating materials depends on  (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these

Last Answer : The electric breakdown strength of insulating materials depends on  (A) Nature of applied voltage (B) lmperfection of dielectric material (C) Pressure, temperature and humidity (D) All or these

What is the effect of heat on insulating material ?

Description : What is the effect of heat on insulating material ?

Last Answer : With increasing temperature, the resistance of almost all solid insulators except Avro decreases. When the temperature drops again, the resistance increases.

Biological functions of lipids include (A) Source of energy (B) Insulating material (C) Maintenance of cellular integrity (D) All of these

Description : Biological functions of lipids include (A) Source of energy (B) Insulating material (C) Maintenance of cellular integrity (D) All of these

Last Answer : Answer : D

Which of the following statements best describes the material known as varnished cambric? A. Felted asbestos sealed with varnish. B. Cotton cloth coated with insulating varnish. C. Rubber insulation coated with a layer of tin. D. Paper impregnated with mineral oil, specially wrapped with nonmetallic tape, and coated with varnish.

Description : Which of the following statements best describes the material known as varnished cambric? A. Felted asbestos sealed with varnish. B. Cotton cloth coated with insulating varnish. C. Rubber ... Paper impregnated with mineral oil, specially wrapped with nonmetallic tape, and coated with varnish.

Last Answer : Answer: B

A circuit breaker differs from a fuse in that a circuit breaker _____________. A. melts and must be replaced B. is enclosed in a tube of insulating material with metal ferrules at each end C. gives no visual indication of having opened the circuit D. trips to break the circuit and may be reset

Description : A circuit breaker differs from a fuse in that a circuit breaker _____________. A. melts and must be replaced B. is enclosed in a tube of insulating material with metal ferrules at each end C. gives no visual indication of having opened the circuit D. trips to break the circuit and may be reset

Last Answer : Answer: D

Which of the following is the most widely used insulating material for steam carrying pipelines? (A) Ceramic fibre blanket (B) Glass wool and 85% magnesia (C) Vermiculite (D) Slag wool

Description : Which of the following is the most widely used insulating material for steam carrying pipelines? (A) Ceramic fibre blanket (B) Glass wool and 85% magnesia (C) Vermiculite (D) Slag wool

Last Answer : (B) Glass wool and 85% magnesia

The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) (A) K/h0 (B) 2K/h0 (C) h0 /K (D) h0 /2K

Description : The critical radius of insulation for a spherical shell is (where, K = thermal conductivity of insulating material h0 = heat transfer coefficient at the outer surface) (A) K/h0 (B) 2K/h0 (C) h0 /K (D) h0 /2K

Last Answer : (B) 2K/h0

What do you understand by tan delta for a insulating material?

Description : What do you understand by tan delta for a insulating material?

Last Answer : Tan delta measurement is done to find the qualities of insulating material. Tan delta is angle between current due to surface leakage or current due to capacitance and the capacitive current. That is Tan δ = Ir / Ic. 

Which of the following is the most widely used heat insulating material for pipelines carrying steam? (A) Tar dolomite bricks followed by asbestos (B) Fireclay refractory followed by aluminium sheet (C) Cotton followed by aluminium foil (D) 85% magnesia cement and glass wool

Description : Which of the following is the most widely used heat insulating material for pipelines carrying steam? (A) Tar dolomite bricks followed by asbestos (B) Fireclay refractory followed by aluminium sheet (C) Cotton followed by aluminium foil (D) 85% magnesia cement and glass wool

Last Answer : (D) 85% magnesia cement and glass wool

What is the major factor that makes coaxial cable less susceptible to noisethan twisted-pair cable? A) inner conductor B) diameterof cable C) outer conductor D) insulating material

Description : What is the major factor that makes coaxial cable less susceptible to noisethan twisted-pair cable? A) inner conductor B) diameterof cable C) outer conductor D) insulating material

Last Answer : outer conductor

A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place (A) The better insulation material should be put just next to pipe (i.e., inside) (B) The better insulating material should be put outside (C) Either of the insulating material could be put on either side (D) Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)

Description : A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place (A) The better insulation material should be put just ... to which insulating material is to be put inside (i.e., just next to the pipe)

Last Answer : (A) The better insulation material should be put just next to pipe (i.e., inside)

Dielectric (A) Is an electrical insulating material (B) Of low resistivity is preferred (C) Should have high thermal conductivity (D) Need not defy the corrosive action of chemicals

Description : Dielectric (A) Is an electrical insulating material (B) Of low resistivity is preferred (C) Should have high thermal conductivity (D) Need not defy the corrosive action of chemicals

Last Answer : (A) Is an electrical insulating material

A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will (A) Increase (B) Decrease (C) Remain unaffected (D) May increase or decrease; depends on the thickness of each layer

Description : A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted ... ) Remain unaffected (D) May increase or decrease; depends on the thickness of each layer

Last Answer : Option C

Carnot cycle efficiency depends upon  (a) properties of the medium/substance used  (b) condition of engine  (c) working condition  (d) temperature range of operation  (e) effectiveness of insulating material around the engine.

Description : Carnot cycle efficiency depends upon  (a) properties of the medium/substance used  (b) condition of engine  (c) working condition  (d) temperature range of operation  (e) effectiveness of insulating material around the engine.

Last Answer : Answer : d

The disadvantage with paper as insulating material is (a) it is hygroscopic (6) it has high capacitance (c) it is an organic material (d) none of the above

Description : The disadvantage with paper as insulating material is (a) it is hygroscopic (6) it has high capacitance (c) it is an organic material (d) none of the above

Last Answer : (a) it is hygroscopic

The insulating material should have (a) low permittivity (b) high resistivity (c) high dielectric strength (d) all of the above

Description : The insulating material should have (a) low permittivity (b) high resistivity (c) high dielectric strength (d) all of the above

Last Answer : (d) all of the above

The insulating material for cables should (a) be acid proof (b) be non-inflammable (c) be non-hygroscopic (d) have all above properties

Description : The insulating material for cables should (a) be acid proof (b) be non-inflammable (c) be non-hygroscopic (d) have all above properties

Last Answer : (d) have all above properties

The insulating material for a cable should have (a) low cost (b) high dielectric strength (c) high mechanical strength (d) all of the above

Description : The insulating material for a cable should have (a) low cost (b) high dielectric strength (c) high mechanical strength (d) all of the above

Last Answer : (d) all of the above

Mica is a (A) Dielectric material. (B) Insulating material. (C) Magnetic material. (D) Both insulating and dielectric material.

Description : Mica is a (A) Dielectric material. (B) Insulating material. (C) Magnetic material. (D) Both insulating and dielectric material.

Last Answer : (D) Both insulating and dielectric material.

If an insulating material is operated beyond the maximum allowable temperature, its life is (a) drastically increased (b) drastically reduced (c) unaffected (d) none of the above

Description : If an insulating material is operated beyond the maximum allowable temperature, its life is (a) drastically increased (b) drastically reduced (c) unaffected (d) none of the above

Last Answer : (b) drastically reduced

The insulating material used between the commutator segments is normally (a) graphite (b) paper (c) mica (d) insulating varnish

Description : The insulating material used between the commutator segments is normally (a) graphite (b) paper (c) mica (d) insulating varnish

Last Answer : Ans: c

State various thermal insulating materials. State any two properties of insulating material

Description : State various thermal insulating materials. State any two properties of insulating material

Last Answer : Thermal insulating materials: 1) Asbestos 2) Aluminum Foil 3) Thermocol 4) Saw dust 5) Cork board slabs 6) Foam glass 7) Rock Wool 8) Glass Wool 9) ... . h) Presence of Moisture: with the increase in moisture content, the coefficient of thermal conductivity rises greatly

Selection of Insulating Material Practical

Description : Selection of Insulating Material Practical 

Last Answer : Practical Significance The identification and selection of proper insulating materials is required for safe working of electrical appliances. The insulating material separates the electrical conductors ... the material for proper application and write the application in observation space.

Define dielectric failure of electrical insulating material.

Description : Define dielectric failure of electrical insulating material. 

Last Answer : Definition of dielectric failure of electrical insulating material. In the insulating material if the applied voltage is increased gradually then for certain value insulation will break down, ... material vanishes its insulating properties and starts conducting, also known as dielectric failure.

State any two applications of gaseous insulating material used in switchgears.

Description : State any two applications of gaseous insulating material used in switchgears. 

Last Answer : Applications of gaseous insulating material used in switchgears:   1. Non inflammable material (gas) in switchgear. 2. High dielectrical strength material in electrical machine. 3. As a cooling agent in circuit breaker

Properties of Insulating Material

Description : Properties of Insulating Material

Last Answer : i. Thermal conductivity: Thermal conductivity of insulating material should be as possible to reduce the thickness of material. ii. Nonflammable: Insulating material should be fire proof and nonflammable ... and should available easily. v. Strength vi. Chemical Stability. vii. Moisture Resistance.

State failure phenomena observed in insulating material. State four reasons for failure of gaseous and solid dielectric materials.

Description : State failure phenomena observed in insulating material. State four reasons for failure of gaseous and solid dielectric materials. 

Last Answer : Failure phenomena in insulating material means the dielectric property fails :  The dielectric failure mean the dielectric strength of insulating material reduces due to high voltages or high ... 6. Due to poor maintenance of insulating material there may be possibility dielectric failure 

State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material.

Description : State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material. 

Last Answer :  (i) Application of PVC paper : 1. It is used in slot lining or motor winding insulation purpose 2. For Insulation of Transformer winding (ii) Application of Porcelain : 1. Mainly used for manufacturing ... on withstand temperature : * H' & C' Class of insulation i e. 180° and above 180°C 

State gaseous and liquid insulating material.

Description : State gaseous and liquid insulating material.

Last Answer : i) Gaseous insulating material : 1. Air 2. Nitrogen 3. Hydrogen 4. SF6 ii) liquid insulating material: 1. Transformer oil 2. Capacitor oil 3. Cable oil 4. Pyranol 5. Savotal 6. Savol 7. Vegetable oil 8. Silicon liquids

Explain the requirements of good insulating material.

Description : Explain the requirements of good insulating material.

Last Answer : Requirement of good insulating material are: i) Electrical ii) Mechanical iii) Thermal iv) Chemical (i) Electrical requirement: A good insulating material should have high resistivity and low ... alkalies. It should not absorb water as water reduces insulation resistance and dielectric strength.

Based on temperature withstanding ability, classify insulating material.

Description : Based on temperature withstanding ability, classify insulating material. 

Last Answer : class Temperature withstanding ability in 0C Materials Y 90 Cotton, silk paper and similar organic materials neither impregnated nor immersed in any oil, rubber, PVC. A 105 ... rubber compounds C Above 180  Mica, ceramics, glass, Teflon, quartz, etc. 

List four examples of insulating material and explain any two.

Description : List four examples of insulating material and explain any two.

Last Answer : Examples of insulating materials:  i) Solid: Ceramic, Porcelain, Mica, Glass, Rubber, Resinous, Fibers  ii) Liquid: Synthetic, Mineral etc.  iii) Gaseous: Hydrogen, Air, ... and low hygroscopicity.  Uses: Insulation in electric field, transformer stampings, armature, pole stampings

What is dielectric strength of an insulating material? What is its unit?

Description : What is dielectric strength of an insulating material? What is its unit?

Last Answer : Dielectric Strength: The dielectric strength of an insulating material is the maximum voltage which the insulating medium can withstand without breakdown. Unit is volts per millimeter (V/mm), or kV/mm or kV/cm

What are insulating material?

Description : What are insulating material?

Last Answer : Insulating material: Insulating material is that which offers very high resistance to the flow of current through it.

State the temperature with standing capacity of following class-insulating material class Y, class A, class B, class E. Also state two examples for each.

Description : State the temperature with standing capacity of following class-insulating material class Y, class A, class B, class E. Also state two examples for each.

Last Answer : S.No Class of Insulating material Temperature withstanding capacity 0C  Examples 1 Class Y' 900C Cotton, Silk paper and similar organic materials neither impregnated nor ... E' 1200C  Cotton fabric, synthetic resin enamels. Paper laminates and Powder plastics

Give classification of insulating materials on the basis of state of material and give one application of each.

Description : Give classification of insulating materials on the basis of state of material and give one application of each.

Last Answer : Classification of Insulating material State of material   Application Solid insulating materials Wood, rubber, plastic, PVC, glass, porcelain, mica, Polypropylene film etc.   ... Switchgears, gas pressures cables, circuit breakers, generator cooling systems and X-ray apparatus

For an insulating material, dielectric strength and dielectric loss should be respectively

Description : For an insulating material, dielectric strength and dielectric loss should be respectively   (A) high and high (B) low and high (C) high and low (D) low and low.

Last Answer : For an insulating material, dielectric strength and dielectric loss should be respectively  high and low 

Surface resistance of an insulating material is reduced due to the

Last Answer : Surface resistance of an insulating material is reduced due to the smoky and dirty atmosphere, humidity in the atmosphere.

The insulating material used between the commutator segments is normally?

Last Answer : The insulating material used between the commutator segments is normally mica.

Why do some bathroom appliances (hair drier, electric ravors, ect) have those buttons on the plug?

Description : Why do some bathroom appliances (hair drier, electric ravors, ect) have those buttons on the plug?

Last Answer : Appliance Leakage Circuit Interrupter to prevent accidental electrocution. It renders the device inoperable in certain abnormal circumstances, like say, immersion in water.

1. Name two safety measures commonly used in electric circuits and appliances. -Physics-10

Description : 1. Name two safety measures commonly used in electric circuits and appliances. -Physics-10

Last Answer : The safety measured commonly used in electric circuits are as follows: Fuse Each circuit should be connected to a fuse because a fuse prevents the flow of excessive current through the circuit. ... to the ground by earthing and the people using the appliance is prevented from getting electrocuted.

Why is dangerous to have electric appliances near you when taking a bath?

Description : Why is dangerous to have electric appliances near you when taking a bath?

Last Answer : There should be no electrical appliances (a portable heater, a hair dryer, anything that is connected to the mains electricity supply) in a bathroom. Electric heaters should be fixed high up on ... happened), could lead to being electrocuted if you accidentally drop the device into the bath water.

What time of the 24 hour day is the cheapest time to use electric appliances (dishwasher, washer, dryer, etc.) If you have central air, once you turn it on at the beginning of the summer is it cheaper to keep it running or turn if off and on on cooler or?

Description : What time of the 24 hour day is the cheapest time to use electric appliances (dishwasher, washer, dryer, etc.) If you have central air, once you turn it on at the beginning of the summer is it cheaper to keep it running or turn if off and on on cooler or?

Last Answer : I think it's cheaper to keep it running then to turn it on and off. You can just control it by turning the temp up and down. You can also go to a Lowe's or Home Depot or any ... of the heat setting. Make sure all your appliances are Energy Star Compliant, this is indicated on a yellow sticker.

Why is earthing desirable for electric appliances?

Description : Why is earthing desirable for electric appliances?

Last Answer : Ans: Earthing helps the current move into the earth in the event of short-circuit, without giving a shock to the user.