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Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because it has low starting as well as running currents at relatively high power factor.

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Description :

Compare reciprocating and rotary air compressor

Answer :

Reciprocating compressor Rotary compressor  1. Compression of air takes place with help of piston and cylinder arrangement with reciprocating motion of piston. 1. Compression of air takes place ... High 12. More Starting torque required 12. Less Starting torque required

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Answer :

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.

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What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero

Answer :

What happens to the capacitance if mica is inserted between the plates of an air capacitor? A) The capacitance increases B) The capacitance decreases C) The capacitance remains the same D) The capacitance becomes zero

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Answer :

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

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Answer :

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

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Answer :

To reverse the direction of rotation of a capacitor start motor while it is running we should disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding.

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Answer :

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

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Description :

List different types of stepper motor. State one application of stepper motor.

Answer :

Types of stepper motor : (i)Variable - reluctance motor (ii) Permanent- magnet motors (iii) Hybrid motors. Applications of stepper motor : In robotics, In CNC machines, In computers, printers, ... In Watches, In biomedical applications such as X-ray machines, CT scan, In Process control systems. 

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Description :

Can we use the synchronous motor as the synchronous capacitor?

Answer :

Yes, we can use the synchronous motor as the synchronous capacitor when the synchrnous motor is overexcited.

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82 views 1 answer
Description :

Why is a capacitor used in a single phase motor and not in three phase motor ?

Answer :

In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

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Answer :

In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.

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Description :

Answer :

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

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Description :

Explain the working of a single phase capacitor start induction motor. 

Answer :

Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

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204 views 2 answers
Description :

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

Answer :

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

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Description :

Answer :

If the capacitor of a single-phase motor is short-circuited the motor will not start.

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Why is it necessary to keep air gaps in magnetic circuits as small as possible?

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Is it AC or DC electricity in the home?

Answer :

Obviously its A.C

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How does electricity get from the power plant to your home?

Answer :

Electricity  gets  into   my   home  due  to  potential  diffrence  created   between  the  live   wire  and  neutral  wire.

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Axial flow compressor 

Answer :

Axial flow compressor : Working Principle: As the fluid enters and leaves in the axial direction, the centrifugal component in the energy equation does not come into play. Here the compression is fully ... the absolute velocity of the fluid and the stator converts this into pressure rise. 

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19 views 1 answer
Description :

Compressor pressure ratio (CPR)

Answer :

Compressor pressure ratio (CPR), is the ratio of the air total pressure exiting the compressor to the air pressure entering the compressor. This number is always greater than 1.0.

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Description :

advantages of multi staging of compressor

Answer :

1) Reduced work of compression per kg of refrigerant 2) Wall thickness of L.P. cylinder is reduced, since it has to withstand lower pressures. This makes compressor lighter and cheaper. 3) Volumetric ... ) Operating cost is reduced 7) It gives more uniform torque; hence size of flywheel is reduced.

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Answer :

As the load is increased the speed of D.C. shunt motor will reduce slightly.

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Application one lamp controlled from two places

Answer :

Application one lamp controlled from two places: 1. For Stair case wiring 2. Hospital Wiring ( For operating the lamp in room and nursing station) 3. Bedroom Lighting. 

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According to application, instruments are classified as switch board, portable.

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The capacitors used in single-phase capacitor motors have no polarity marking.

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In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.

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The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

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application of CRO.

Answer :

Applications of CRO: 1) Voltage measurement. 2) Current measurement. 3) Measurement of phase difference. 4) Measurement of phase. 5) Measurement of frequency. 6) Measurement of inductance. ... in various circuits. 17) For checking transistor. 18) It can measure short time interval.

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 application of logic analyzer.

Answer :

Digital systems. Computer systems Logic circuits. Testing complex digital

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State principle of operation of piezo-electric transducer. State its application.

Answer :

The piezoelectric element used for converting mechanical movement into electric signals. The mechanical deformation generates charges and this charge appears as a voltage across the electrodes.  ... destructive test (NDT) equipments 6. Piezoelectric materials are used in ultrasonic transducers. 

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State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.

Answer :

Phase Sequence Indicator:  1. For finding correct phase sequence of supply  2. For obtaining exact instant of parallel operation of alternators.  3. For obtaining reversal of rotation ...  4. In electroplating industries   5. In various processes industries for measuring power factor

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What is Amorphous metal? Give one application of this metal.

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Amorphous Metals: Amorphous Metals means materials that do not possess a particular structure. Metal alloys typically possess crystalline atomic structure. The atoms are arranged in particular ... cores of special transformers d) Manufacturing magnetic sensors e) Magneto-motive sensors 

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Application of Norton's theorem to a circuit yields?

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Application of Norton's theorem to a circuit yields equivalent current source and impedance in series.

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What is the application of thyristor?

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Application Specific Instruction Set Processor (ASIP)

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An application specific instruction set processor (ASIP) can serve as a compromise between the general purpose processor and single-purpose processors. An ASIP is a Programmable processor ... fetch sequential data memory locations in parallel with other operations to further speed execution.

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Integrated circuit design for particular application is known as Application Specific Integrated Circuit ASIC. ASIC have smaller size, less power consumption and less cost .

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Description :

In an induction motor if the flux density is reduced to one-half, of its normal value then the torque will  (1) reduce to one-half (2) reduce to one-fourth (3) remain unchanged (4) increase four times

Answer :

In an induction motor if the flux density is reduced.to one-half, of its normal value then the torque will reduce to one-fourth

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Graph indicating changes in pollutants level w.r.t air fuel ratio

Answer :

Graph indicating changes in pollutants level w.r.t air fuel ratio

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Explain fuel system and air intake system in diesel electric power plant.

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Fuel system and air intake system in diesel electric power plant :  Fuel system: It consists of storage tank, strainers, fuel transfer pump and all day fuel tank. The fuel oil is supplied ... Filters are provided to remove dust particles from air which may act as abrasive in the engine cylinder.

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An air gap is usually inserted in magnetic circuits to?

Answer :

An air gap is usually inserted in magnetic circuits to prevent saturation.

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Answer :

Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.

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The current zero interruption, in oil and air blast circuit breakers, is achieved by?

Answer :

The current zero interruption, in oil and air blast circuit breakers, is achieved by lengthening of the gap, cooling and blast effect.

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Answer :

Sparking, is discouraged in a D.C. motor because commutator gets damaged.

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Answer :

The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it helps in reducing the tendency of the rotor teeth to remain under the stator teeth.

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Description :

What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

Answer :

What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

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 applications of compressed air

Answer :

1) To drive air motors in coal mines. 2) To inject fuel in air injection diesel engines. 3) To operate pneumatic drills, hammers, hoists, sand blasters. 4) For cleaning purposes. 5) To cool large ... and farm maintenance. 7) In vehicle to operate air brake. 8) For spray painting in paint industry.

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Description :

State the functions of following elements: i) Diesel engine system ii) Air intake system iii) Engine exhaust system iv) Engine starting system.

Answer :

i) Diesel engine system:-  Four strokes Two strokes ii) Air intake system:- Air intake system is provided to supply air to engine cylinder for fuel combustion.  iii) Engine exhaust system ... provided to rotate the engine initially until the firing starts and engine run under its own power. 

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Description :

Describe with neat diagram air friction damping. 

Answer :

Air Friction Damping: Here air trapped in the chamber works as damping medium for the piston movement connected to the spindle. The piston moves in the air chamber. The clearance between piston and ... will be the damping torque, bringing the pointer to the equilibrium position quickly. 

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