Every AC supply is not ideal AC it contains DC component so to provide restriction to DC component in supply we have to use Capacitor

answered
Jan 21, 2018
by
NITIN P. DESHMUKH

**Description :** For a DC circuit capacitor is

**Last Answer :** For a DC circuit capacitor is virtually an open circuit

**Description :** Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

**Last Answer :** Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.

**Description :** How does a capacitor improve power factor?

**Last Answer :** Every circuit are usually more inductive than capacitive.it means that the current lags by voltage at small angle.hence we have to compensate this situation so we use Capacitor then this lag is compensate ... angle becomes low and the value of cos(phase angle) is increase and hence power also max.

**Description :** Thyristor Switched Capacitor (TSC)

**Last Answer :** Thyristor Switched Capacitor (TSC) TSC is a static compensator. TSC is use for compensating reactive power. Compensation is required for voltage regulation, increasing stability, ... compensating device like TCS phase angle between voltage and current can be maintain.

**Description :** Explain working of static AC circuit breaker.

**Last Answer :** Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

**Description :** Explain working of AC circuit breaker using SCR with circuit diagram.

**Last Answer :** AC Circuit Breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

**Description :** An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V

**Last Answer :** An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V

**Description :** An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

**Last Answer :** An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

**Description :** A parallel AC. circuit in resonance will?

**Last Answer :** A parallel AC. circuit in resonance will have a high impedance.

**Description :** In an AC. circuit, a low value of kVAR compared with kW indicates?

**Last Answer :** In an AC. circuit, a low value of kVAR compared with kW indicates high power factor.

**Description :** Can you apply Thevenin's theorem in an AC circuit?

**Last Answer :** It can be applied to AC circuits

**Description :** In an A.C. circuit power is dissipated in?

**Last Answer :** In an A.C. circuit power is dissipated in resistance only.

**Description :** The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is?

**Last Answer :** The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is 6 kVAR.

**Description :** The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

**Last Answer :** The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is 32 kW.

**Description :** Pure inductive circuit takes power from the A.C. line when?

**Last Answer :** It takes power when voltage decreases and current increases.

**Description :** In any A.C. circuit always?

**Last Answer :** In any A.C. circuit always apparent power is more than actual power.

**Description :** All the rules and laws of D.C. circuit also apply to A.C. circuit containing?

**Last Answer :** All the rules and laws of D.C. circuit also apply to A.C. circuit containing resistance only.

**Description :** what is TCSC?

**Last Answer :** Thyristor Controlled Series Capacitor (TCSC)

**Description :** State the applications and specification of (i) Resistor (ii) Capacitor (iii)Inductor

**Last Answer :** Application of resistor: 1.Resistors are used in high frequency instrument. 2.Resistor is used in power control circuit. 3.It is used in DC power supplies. 4.Resistors are used ... DC Current 3.Electromagnetic Interference (EMI) 4.Magnetic Saturation Flux Density 5.Curie Temperature

**Description :** Charging Action of capacitor

**Last Answer :** Charging Action of capacitor .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%; }

**Description :** Capacitor : Before charging takes place

**Last Answer :** Capacitor : Before charging takes place

**Description :** 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.

**Description :** Does current flow through a capacitor ?

**Last Answer :** Imagine a pipe with a flexible diaphram in the middle separating two haves of the pipe. Now the pipe is filled with air. If you apply a pressure to one end the diaphram will deform ... capacitor, the effects on electrons will be recreated across the boundary. But theres no electrical connection...

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

**Last 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

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

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

**Description :** Energy stored in capacitor examples

**Last Answer :** Energy stored in capacitor examples

**Description :** Series and parallel capacitor problem

**Last Answer :** Series and parallel capacitor problem 1 : https://youtu.be/MSl5mRwtjAE Series and parallel capacitor problem 2 : https://youtu.be/yGwbpyEtIyw Series and parallel capacitor problem 3 : https:// ... https://youtu.be/_7KwEwWqiNU Series and parallel capacitor problem 10 : https://youtu.be/et8MCWV_OyE

**Description :** Problem on capacitor

**Last Answer :** Problem on capacitor 1 : https://youtu.be/ZyT3WOFN8fs Problem on capacitor 2 : https://youtu.be/JBwEfekvutE Problem on capacitor 3 : https://youtu.be/E1lhIn5t8Mo Problem on capacitor 4 : https://youtu.be/yl651f4IUfg

**Description :** What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... in power systems to step down extra high voltage signals and provide low voltage D) None of these

**Last Answer :** What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... power systems to step down extra high voltage signals and provide low voltage D) None of these

**Description :** 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

**Last 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

**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

**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

**Description :** What is the stored energy when 200 V is applied across a 7 μF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these

**Last Answer :** What is the stored energy when 200 V is applied across a 7 μF capacitor? A) 1400 Joules B) 0.7 Joules C) 0.14 Joules D) None of these

**Description :** Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

**Last Answer :** Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

**Description :** Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

**Last Answer :** Dielectric loss in a capacitor is best measured by Schering Bridge

**Description :** A capacitor is generally a?

**Last Answer :** A capacitor is generally a linear and bilateral component.

**Description :** The best place to install a capacitor is?

**Last Answer :** The best place to install a capacitor is across the terminals of the inductive load.

**Description :** The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_____ohms.

**Last Answer :** The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes 10 ohms.

**Last Answer :** Commonly used standard capacitor is concentric cylindrical type.

**Last Answer :** If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.

**Description :** When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is ?

**Last Answer :** When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is all right.

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

**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.

**Last 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.

**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.

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

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

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

**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?

**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.

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

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