Please Log in or Register for more.


169 views

1 Answer

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.

Like 0 like

Please log in or register to answer this question.

Related Questions



Last Answer : Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

Show More

222 views 1 answer








Last Answer : In a single phase motor the centrifugal switch disconnects auxiliary winding of the motor.

Show More

269 views 1 answer








Last Answer : A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

Show More

875 views 1 answer








Last Answer : 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.

Show More

74 views 1 answer








Last 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.

Show More

131 views 1 answer








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

Show More

101 views 1 answer








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

Show More

162 views 1 answer








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

Show More

98 views 1 answer







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

Show More

260 views 6 answers







Explain the working of a single phase capacitor start induction motor. 
Last Answer : Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

Show More

394 views 2 answers








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

Show More

223 views 1 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?
Last 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.

Show More

231 views 1 answer








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

Show More

207 views 1 answer








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

Show More

104 views 1 answer







Can we use the synchronous motor as the synchronous capacitor?
Last Answer : Yes, we can use the synchronous motor as the synchronous capacitor when the synchrnous motor is overexcited.

Show More

91 views 1 answer








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

Show More

133 views 1 answer








Last Answer : If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in damage to the starting winding.

Show More

129 views 1 answer







State two advantages and disadvantages of centrifugal casting. Write four applications.
Last Answer : Centrifugal Casting: Advantages: 1. Relatively very light impurities move inwards towards center. So they can be removed easily thus helping in producing sound castings. 2. Gates and risers are not needed. ... making rollers. 4. Piston rings. 5. Cylinder liners. 6. Pipes of water gas sewage.

Show More

50 views 1 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
Last 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

Show More

100 views 1 answer







A 3 micro Faraday capacitor is connected closing a switch to a supply of 100 V through 1 milli ohm series resistance. Calculate 1 the time constant 2 initial charging current 3 the initial rate of ... second,after the switch has been closed 5 the time taken for the capacitor to be fully charged.

Show More

98 views 0 answers







Draw & explain touch plate switch using IC555.
Last Answer : It is construct form monostable multivibrator , when metal plates touch by finger then voltage at pin number 2 goes to below 1/3 Vcc then output of lower comparator becomes high hence flip flop set and ... then output of timer goes low and it low till up to the metal plates touch by finger .

Show More

73 views 1 answer







A switch tail ring counter is made by using a single D-FF. The resulting circuit is (A) T-FF (B) D-FF (C) SR-FF (D) JK-FF
Last Answer : A switch tail ring counter is made by using a single D-FF. The resulting circuit is T-FF

Show More

186 views 1 answer







I need to buy really low voltage electrolytic capacitors.
Last Answer : answer:Allied Electronics http://www.alliedelec.com/ Weird hobby though.

Show More

2 views 1 answer







Do capacitors in parallel have the same voltage?
Last Answer : Not same but we will get addition of both values when capacitors are connected in parallel...

Show More

312 views 8 answers







Should I switch to a credit union?
Last Answer : I switched from a bank to a credit union a long time ago. Competitive interest rates, fewer fees, easier loan approvals, better customer service.

Show More

2 views 1 answer







How to Replace a Light Switch
Last Answer : How to Replace a Light Switch They say it only takes one idiot to change a light bulb, but to change a light switch requires the skill and carefulness of a handyman. If you have a malfunctioning or a ... doesn't have to be a hassle. Just remember these steps and switching a new switch will be easy.

Show More

9 views 1 answer







How to Install a Timer Switch
Last Answer : How to Install a Timer Switch A timer switch is a handy device that automatically turns off a switch after a fixed period of time. This is particularly useful when you have kids at home ... safety precautions when installing switches or anything that might put you in the direct path of electricity.

Show More

8 views 1 answer







How To Install A Dimmer Switch
Last Answer : How To Install A Dimmer Switch Having a room with a bright light is good, but there are instances when you need the lights to be lower than what you're accustomed. You need to have a dimmer switch, ... your home. Follow them properly, and you'll be able to fiddle with the light levels in your home.

Show More

7 views 1 answer







How to Wire a Three-Way Switch ?
Last Answer : How to Wire a Three-Way Switch A three-way switch is the most common system installed in residential areas. This system is used to control a light and receptacle or more from two different switches ... wires for interior use. #14 wires are suggested to be used for protected circuits at 15 amperes.

Show More

12 views 1 answer







Give the function of fuse and switch.
Last Answer : Functions of fuse:  * To break the circuit under fault condition.  * To provide overcurrent protection to the circuit.  * To provide short circuit protection to the circuit.  * To provide ...  * To make the electric circuit manually.  * To break the electric circuit manually.

Show More

120 views 1 answer







State the function of : i) MCCB ii) ELCB iii) MCB iv) Switch. 
Last Answer : i) MCB: Provide short circuit protection & over load protection to electrical loads.  ii) ELCB: Provides protection by detecting the unsafe magnitudes leakage currents flowing to earth and disconnecting ... rating.  iv) Switch: Make and break the electrical connection to the load manually.

Show More

2.7k views 3 answers







Transfer switch
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

Show More

59 views 1 answer







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

Show More

329 views 1 answer







Earthing switch is used for?  (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above 
Last Answer : Earthing switch is used for?  (A) Measuring of safety voltage (B) Protection of equipment from ground faults (C) Discharging residual energies (D) All of the above 

Show More

113 views 1 answer







The device which allows reverse power flow and withstands highest switch frequency is (A) GTO (B) MOSFET (C) IGBT (D) Inverter grade SCR
Last Answer : The device which allows reverse power flow and withstands highest switch frequency is MOSFET

Show More

89 views 1 answer







A closed switch has a resistance of?
Last Answer : A closed switch has a resistance of zero.

Show More

140 views 1 answer








Last Answer : The switch board instruments should be mounted in vertical position.

Show More

90 views 1 answer








Last Answer : A thermal protection switch can protect against overload.

Show More

233 views 1 answer








Last Answer : Yes ,it is one of the main advantage using thristors as a  switch in DC  circuit ,it has a high current gain

Show More

160 views 2 answers








Last Answer : Yes, SCR is a unidirectional switch.

Show More

77 views 1 answer







What are the desirable characteristics of ideal switch?
Last Answer : Desirable characteristics of the ideal switch: It is desirable to have power switches characteristics closer to ideal switch. The ideal switch should have the following characteristics. Zero resistance when ... . 100% efficiency. Able to control power flow with zero power dissipation.

Show More

1.2k views 1 answer







What is the difference between a switch and a relay?
Last Answer : Switch is simply a mechanical contact mechanism and relay is a electromagnetic switch . Switch can be direct mechanically turn on and off but relay can be operated by energising coil .

Show More

110 views 1 answer








Last Answer : BJT act as switch in saturation and  cutoff region ( ON state in saturation region and OFF state in cut-off region )

Show More

127 views 2 answers








Last Answer : Because it has a higher switching frequency and heat tolerance.

Show More

143 views 1 answer







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
Last 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

Show More

371 views 1 answer







If a single-phase induction motor fails to start, the problem may be _____________. A. an open in the main winding B. a shorted shunt field C. a closed centrifugal switch D. low circuit frequency
Last Answer : Answer: A

Show More

3 views 1 answer







If a single-phase induction motor fails to start, the problem may be _____________. A. an open in the run winding B. a shorted shunt field C. a closed centrifugal switch D. low circuit frequency
Last Answer : Answer: A

Show More

2 views 1 answer







If the centrifugal switch or relay used for cutting out the starting winding of a split-phase induction motor fails to open once the motor is in operation, the _____________. A. motor will overspeed B ... C. motor will immediately stall under load D. motor torque will be above normal at rated speed
Last Answer : Answer: B

Show More

11 views 1 answer







Obtain the Ripple factor of a full wave rectifier with shunt capacitor filter.

Show More

9 views 0 answers







Describe the operation of shunt capacitor filter with the help of circuit diagram and waveforms.

Show More

46 views 0 answers






Show More⇦ PreviousNext ⇨