The range of frequencies used in induction heating is : more than 1 kHz
Description : The frequencies and voltage used in Dielectric heating are (A) 10 – 30 MHz, upto 25 kV (B) 50 – 60 Hz, upto 25 kV (C) 10 – 30 MHz, upto 100 V (D) 50 – 60 Hz, 110 V – 230 V
Last Answer : The frequencies and voltage used in Dielectric heating are 10 – 30 MHz, upto 25 kV
Description : Enlist any four advantages of induction heating.
Last Answer : Advantages of Induction heating https://youtu.be/RcdH_74VJz0
Last Answer : Yes, Induction heating is used for both magnetic and non-magnetic materials.
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
Description : State starters used for i) 3-Ph squirrel cage induction motor (3HP) ii) D.C. motor
Last Answer : Name the starters used for following motors : i) 3 H.P. 3-Ph squirrel cage I.M: i) DOL starter OR ii) Star-Delta Starter OR ii) Auto transformer starter OR iii) Soft start starter. ii) D.C Shunt Motor : 1) Armature resistance starter (Three Point Starter) OR 2) Four Point Starter
Last Answer : For handling greater currents induction wattmeters are used in conjunction with current transformers.
Last Answer : The repulsion-start induction-run motor is used because of high starting torque.
Description : For arc welding current range is usually (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A
Last Answer : For arc welding current range is usually 100 to 350 A
Last Answer : The braking retardation is usually in the range 10 to 15 km phps.
Last Answer : For diesel locomotives the range of horsepower is 1500 to 2500.
Description : Wire-wound resistors are unsuitable for use at high frequencies because they?
Last Answer : Wire-wound resistors are unsuitable for use at high frequencies because they exhibit unwanted inductive and capacitive effects.
Description : At ______ frequencies the parallel R-L circuit behaves as purely resistive.
Last Answer : At very high frequencies the parallel R-L circuit behaves as purely resistive.
Description : At very low frequencies a series R-C circuit behaves as almost purely?
Last Answer : At very low frequencies a series R-C circuit behaves as almost purely capacitive.
Description : Can underfloor heating be installed under the wooden floor ?
Last Answer : Under-floor hydronic or steam heat can certainly be installed underneath wooden floors. I have personally installed one instance of hydronic (hot water) heat system under wooden flooring, and have demolished ... heat, but I have visited such places on many occasions and found them very comfortable.
Description : What is the best cost effective way to use central heating.
Last Answer : no don’t close the doors. The air needs to recycle itself, so you need proper circulation. close vents in rooms you don’t use and use directional vents pointing down (winter months) in the rooms you do. One last thing, make sure you have a clean filter.
Description : How to Install Baseboard Heating
Last Answer : How to Install Baseboard Heating If you have a small apartment or room that you want to heat in an efficient manner, one effective method is by using electric baseboard heating. Installing it yourself might seem ... these steps and you're sure to have a cozy and warm indoor area, all the time.
Description : How to Make a Heating Pad ?
Last Answer : A heating pad is a very important item to have around in the household. Whether it's a headache, menstrual cramps or other pains, a heating pad would make for a great help. This heating pad is also made ... is that there are a myriad of ways we can use for things that we think are no longer useful.
Description : How to install autonomous heating?
Last Answer : Autonomous heating and hot water supply is gaining popularity and is used not only in winter, but also in summer. The reason for this, as a rule, is large bills from utilities, as well as the ... a boiler, you should not save on the reliability of the boiler, on control equipment and on service.
Description : State advantages of electric heating over other types of heating methods.
Last Answer : Advantages of Electric heating over the other types of heating methods: 1. It can be put into service immediately. 2. No standby losses. 3. High efficiency. 4. More economical ... low attention and supervision. 14. Protection against overheating can be provided by suitable switch gear.
Description : _______ is used for heating non -conducting materials. (1) Eddy current heating (2) Arc heating (3) Induction heating (4) Dielectric heating
Last Answer : Dielectric heating is used for heating non -conducting materials.
Last Answer : In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.
Description : How to Light the Pilot Light on a Gas Range
Last Answer : How to Light the Pilot Light on a Gas Range Gas ranges are easy to work with, you just turn the knob and they're ready to be used. Sometimes, though, your gas range's pilot light goes off, ... , though, it's best to contact a local gas company or the manufacturer, to help you solve the problem.
Description : State RADAR range equation and write factor influencing maximum range.
Last Answer : Free Space RADAR range Equation: 1.RADAR range equation relates the range of a RADAR to the chara. Of Tx, Rx, Antenna, target & environment. 2.Free space means RADAR and target are isolated in ... is no obstacle between RADAR antenna & the target. 4.There will be No absorption of EM waves.
Description : Define: i) Range ii) Span of instruments
Last Answer : i) Range: It is defined as the difference between Greatest and Smallest value of the data or reading of the instrument. ii) Span: It is defined as the algebraic difference between the upper and lower range values
Description : State the advantages of instrument transformer in using for extension of range of meters.
Last Answer : Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.
Description : State the range for low and medium resistance.
Last Answer : Low resistances: less than 1 ohm. Medium resistances: 1 ohm to 0.1 Mega ohm.
Description : How range of A.C. ammeter & A.C. voltmeter is extended? Draw suitable diagram.
Last Answer : Extension of A.C. Ammeter Range: The range of a.c. ammeter can be extended by using CT, the arrangement is shown in figure. The CT is current transformer having less number of primary turns carrying high ... high magnitude of source voltage. In this way range of a.c. voltmeter can be extended.
Description : List two types of oscillator, which generates frequency in RF range.
Last Answer : Types of Oscillators generating frequencies in RF range: i) Hartley Oscillator ii) Colpitt’s Oscillator iii) Clapp Oscillator
Description : What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz
Last Answer : What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz
Last Answer : The wattage rating for a ceiling fan motor will be in the range 50 to 150 W .
Last Answer : The range of efficiency for shaded pole motors is 5% to 35%.
Last Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.
Description : The motor used for electric traction is (1) D.C. shunt motor (3) D.C. series motor (2) D.C. compound motor (4) Synchronous motor
Last Answer : The motor used for electric traction is D.C. series motor
Description : Spot welding is used for (1) Thin metal (3) Castings only (2) Rough and irregular surface (4) Thick sections
Last Answer : Spot welding is used for Thin metal
Description : The electrode rod used for welding uses a coating on it
Last Answer : The electrode rod used for welding uses a coating on it to give a vapour to serve as a shielding gas to protect the weld area from atmospheric contamination and to provide slag to protect the welded area
Last Answer : The voltage used for suburban trains in D.C. system is usually 600 to 750 V.
Description : Which type of motor is used in lift?
Last Answer : Synchronous motor
Description : Any recommendations for wood stoves?
Last Answer : We had a fireplace insert decades ago. It put out heat, of course, but in no way compared to our free standing, cast iron fireplace which could heat up a small city . It looked cool to me; that’s a matter of taste of whether you like a rustic look. For safety, we never gave it a second thought.
Description : What type of furnace do I need?
Last Answer : What is your current heat source for the baseboard heaters? For example, are they electric baseboard heaters or hot water/steam baseboard heaters?
Description : Can you recommend a good space heater?
Last Answer : I suggest a ceramic heater because it is cool to the touch and puts out a lot of heat. I have a small one that heats up my entire family room in the basement.
Description : SINGLE PHASE INDUCTION MOTORS MCQ
Last Answer : 101. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on (a) running winding (b) rotor winding (c) field winding (d) compensating winding Ans: a ... motor is usually reduced by using (a) gearing (b) belts (c) brakes (d) chains Ans: a
Description : THREE PHASE INDUCTION MOTORS MCQ
Last Answer : 101. Insertion of resistance in the stator of an induction motor (a) increases the load torque (b) decreases the starting torque (c) increases the starting torque (d) none of the above Ans: b
Description : Explain the working principle of induction motor.
Last Answer : Working principle of induction motor: * When the motor is excited with three-phase supply, three-phase stator winding carries three-phase currents & produces a rotating magnetic field of constant magnitude and ... , which tend to move the rotor in the same direction as the rotating magnetic field.
Description : Explain the activities carried out during weekly maintenance of 3 ph. Induction motor.
Last Answer : Activities Carried out During Weekly Maintenance of 3 ph. Induction Motor: 1) Check belt tension. In cases where this is excessive it should immediately be reduces and in the case of sleeve ... and cooled by oil mist systems its important to check the oil mist flow paths/pressure components.
Description : State the function of following parts in Induction motor. (i) Stator (ii) Slip rings
Last Answer : Name of part Function Stator 1) Stator frame supports the core, terminal box and protects the inner parts. 2) Stator core houses stator winding. 3) Stator winding ... ) Provides facility to connect external resistance to rotor circuit through brushes for starting and control.
Description : Electro Magnetic Induction
Last Answer : Electro Magnetic Induction
Description : List the energy conservation technique in induction motor.
Last Answer : Following are the list of energy conservation techniques in electrical motors: 1) Reduction in iron losses by using low loss silicon steel core material laminated to thinner dimension. 2) Using bigger length ... at light load. 13) By rewinding in induction motor 14) By motor survey
Description : With a neat sketch give the working of shaded pole induction motor.
Last Answer : Explanation: It has squirrel cage rotor and salient pole stator. The stator poles are shaded partially by short circuited conductor band to create the phase difference between the fluxes emerging from shaded ... rotating magnetic field in the air-gap and torque is exerted on the squirrel cage rotor.
Description : What will happen if the induction motor runs at synchronous speed ?
Last Answer : Since there is always slip present in rotor it cannot run at synchronous speed no current will be developed hence no torque will developed
Description : Define Slip of Induction Motor.
Last Answer : Slip: It is the ratio of relative speed of rotor (difference between synchronous speed and rotor speed) to the synchronous speed of rotating magnetic field. Slip = (NS – N) / NS where , NS = synchronous speed, N = speed of rotor