# The wattage rating for a ceiling fan motor will be in the range?

The wattage rating for a ceiling fan motor will be in the range 50 to 150 W .

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Answer : In a ceiling fan employing capacitor run motor secondary winding surrounds the primary winding.

Answer : The wattage of motor for driving domestic sewing machine will be around 100 to 150 W.

Description : Why is a capacitor used in a ceiling fan ?

Answer : For splitting phase so that a rotating magnetic field will be produced & as per Lenz's law a torque will be created & rotor starts rotating. In single phase if capacitor is not used for split phase then a pulsating mag. field is produced which is unable to produce torque on rotor

Answer : Capacitor use in fan is made up of dielectic material which is in semi solid material having high capacity.but generation of heat in capacitor the semi solid material converted into dry solid because of ... capacity becomes lower and lower so for good result of our fan we have to change it.

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Description : State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders

Answer : Application Suitable Single Phase Motor Table Fan 1) Capacitor split phase motor 2) Capacitor start capacitor run motor Mixers and Grinders 1) Universal motor 2) A.C. Series motor

Answer : For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.

Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.

Description : For testing appliances, the wattage of test lamp should be?

Answer : For testing appliances, the wattage of test lamp should be high.

Answer : The range of efficiency for shaded pole motors is 5% to 35%.

Description : The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be :  (A) 34.64 kVA (B) 75 kVA (C) 20 kVA (D) None of the above

Answer : The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be : 34.64 kVA

Description : Which supply and exhaust fan to choose for your home?

Answer : Usually, "European-style renovation" begins with the installation of double-glazed windows and careful closure of all existing ventilation openings in the room. It is interesting, but few people know that ... street, for which fans are used, which are inserted directly into the window or window.

Description : The rating of transformer may be expressed in ____________.  (A) kVAR (B) kW (C) kVA (D) Horse power

Answer : The rating of transformer may be expressed in kVA .

Description : Stretch ceiling. What to look for when choosing?

Answer : Stretch ceiling is a great view of interior decoration. It allows you to create a pleasant aesthetic environment and to hide pronounced surface defects. However, like any finishing material, solid artificial ... that will ensure the quality not only of the coating, but also of the installation work.

Description : Which ceiling to choose for the bathroom?

Answer : Which ceiling to choose for the bathroom? The bathroom is a room with high humidity, it requires special attention when installing ventilation, choosing appropriate furniture, materials for wall and ceiling ... ceiling an ideal solution for your bathroom. But the choice, of course, is yours!

Description : Which ceiling is suitable for a bathroom?

Answer : Which ceiling is suitable for a bathroom? If you want to make repairs in the bathroom at an affordable price and we are not talking about long-term construction, then a rack suspended ceiling ... colors and shades of such ceilings will allow you to create your own unique design in the premises.

Description : How rating of main switch and cable is selected for Industrial Installation.

Answer : 1. Rating of Main Switch or Fuse Rating is decided in industrial installation: Rating of main switch or fuse is based up the starting current of motor. For calculating starting current is considered 2 ... take 1.5 times the rated current or full load current. & thus cable rating is decided.

Description : Explain any two energy conservation techniques in fan.

Answer : Following are energy conservation techniques in Fans : 1) Use the electronic regulators instead of conventional regulator: Function of regulator is to control the speed of the fan. The conventional regulators ... 't forget to properly maintain your electric fan and keep it in good working order.

Description : How to glue a ceiling plinth?

Answer : Ceiling plinth is used to decorate the angle between the wall and the ceiling. This decorative element is also called fillet. Installation is carried out after leveling the walls and ceiling. We ... After completing the process, the ceiling plinth is painted, usually in the color of the ceiling.

Description : Ceiling lamps. What are they and how to choose?

Answer : Well-chosen lighting can stimulate productive activities and can create an intimate and relaxing atmosphere. The variety of ceiling lights is not limited to traditional center chandeliers. In addition ... Their placement along the perimeter of the bathroom will visually make the room more spacious.

Description : How to choose a modern stretch ceiling?

Answer : How to choose a modern stretch ceiling? Renovation in an apartment, which many consider to be quite messy and troublesome, today can be easily turned into a less dusty procedure. To do this ... , stretch ceilings from Swiss, Russian and Chinese manufacturers are in great demand on the market today.

Description : State function of i) Ceiling rose ii) Conduit

Answer : Function of Ceiling rose: Output connection for ceiling fan or tube.  Function of Conduit – To run the wires from switch board to appliances.

Description : Why Transformer rating is given in kVA?

Answer : 1) The output of transformer is limited by heating due to the losses. Two types of losses in the transformer (i) Iron loss, (ii) Copper loss. 2) Iron loss depends on the transformer voltage (V). ... by load power factor. - Hence the transformer output is expressed in VA or kVA and not in kW.

Description : Boiler rating is usually defined in terms of  (1) Maximum temperature of steam in Kelvin (2) Heat transfer rate in KJ/hr (3) Heat transfer area in metre2 (4) Steam output in kg/hr

Answer : Boiler rating is usually defined in terms of Steam output in kg/hr

Answer : The fuse rating is expressed in terms of current.

Description : Define kVA rating of transformer.

Answer : kVA rating of transformer is defined as the product of voltage (V) and current (I) on primary side of transformer or secondary side of transformer divided by 1000. On both side the VA rating remains ... Mathematically kVA rating is given by, kVA rating of transformer = V1I1/1000 =V2I2/1000

Description : State the advantages of instrument transformer in using for extension of range of meters.

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.

Answer : Low resistances: less than 1 ohm.  Medium resistances: 1 ohm to 0.1 Mega ohm.

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

Answer : For arc welding current range is usually 100 to 350 A

Answer : For diesel locomotives the range of horsepower is 1500 to 2500.

Description : The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be?

Answer : The number of poles in a phase induction motor at 50 Hz and running at 1500 rpm will be 4.

Answer : When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

Answer : The value of starting capacitor of a fractional horse power motor will be 300 uF .

Description : List two types of oscillator, which generates frequency in RF range.

Answer : Types of Oscillators generating frequencies in RF range: i) Hartley Oscillator ii) Colpitt’s Oscillator iii) Clapp Oscillator

Description : The range of frequencies used in induction heating is :  (A) 0-25 Hz  (C) less than 200 Hz  (B) 50 to 100 Hz  (D) more than 1 kHz

Answer : The range of frequencies used in induction heating is : more than 1 kHz

Answer : The braking retardation is usually in the range 10 to 15 km phps.

Description : State RADAR range equation and write factor influencing maximum range.

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

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 : How range of A.C. ammeter & A.C. voltmeter is extended? Draw suitable diagram.

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 : 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

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

Answer : A shaded pole motor can be used for toys, hair dryers, circulators etc.

Answer : In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.

Answer : Direction of rotation of a split phase motor can be reversed by reversing the connection of either running winding or starting winding.

Description : The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be?

Answer : The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be at the slot edge where coil enters or comes out of the slot.

Answer : In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.

Description : Synchronous wattage of induction motor means: A) rotor input in watts B) stator input in watts C) combined stator and rotor input in watts D) shaft output in watts

Answer : Synchronous wattage of induction motor means: rotor input in watts

Description : Describe the following energy conservation methods of electrical motor. i) By motor survey ii) By matching loads with motor rating

Answer : Energy conservation methods of electrical motor:  1) By Motor Survey: Large industries have a massive population of LT motors. Load survey of LT motors can be taken-up methodically to ... -speed motors, eddy-current couplings, fluid couplings, and solid-state electronic variable speed drives.

Description : which motor is use in ceiling fan?

Answer : Capacitor start capacitor run induction motor

Answer : In case of a shaded pole motor the direction of rotation of the motor is from main pole to shaded pole.

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