Description : Power factor of an inductive circuit is usually improved by connecting capacitor to it in?
Answer :
Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.
asked
Mar 25, 2018
by
anonymous
Description : What is the role of a capacitor in a circuit?
asked
Mar 15, 2018
by
anonymous
Description : In an AC. circuit, a low value of kVAR compared with kW indicates?
Answer :
In an AC. circuit, a low value of kVAR compared with kW indicates high power factor.
asked
Mar 25, 2018
by
anonymous
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
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
asked
Apr 29, 2018
by
anonymous
Description : Can you apply Thevenin's theorem in an AC circuit?
Answer :
It can be applied to AC circuits
asked
Mar 10, 2018
by
anonymous
Description : Can we apply Norton's theorem in an AC circuit?
asked
Mar 10, 2018
by
anonymous
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
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
asked
Jun 18, 2018
by
anonymous
Description : For a DC circuit capacitor is
Answer :
For a DC circuit capacitor is virtually an open circuit
asked
May 8, 2018
by
anonymous
Description : A parallel AC. circuit in resonance will?
Answer :
A parallel AC. circuit in resonance will have a high impedance.
asked
Mar 25, 2018
by
anonymous
Description : Explain power in single phase AC circuit.
asked
Mar 11, 2018
by
anonymous
Description : Explain working of static AC circuit breaker.
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.
asked
May 21, 2020
by
anonymous
Description : Explain working of AC circuit breaker using SCR with circuit diagram.
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.
asked
Oct 13, 2019
by
anonymous
Description : Can we apply the superposition theorem to AC circuit?
asked
Mar 10, 2018
by
anonymous
Description : In an A.C. circuit power is dissipated in?
Answer :
In an A.C. circuit power is dissipated in resistance only.
asked
Mar 25, 2018
by
anonymous
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?
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.
asked
Mar 25, 2018
by
anonymous
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?
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.
asked
Mar 25, 2018
by
anonymous
Description : How does a capacitor improve power factor?
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.
asked
Dec 16, 2017
by
anonymous
Description : Thyristor Switched Capacitor (TSC)
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 : In any A.C. circuit always?
Answer :
In any A.C. circuit always apparent power is more than actual power.
asked
Mar 25, 2018
by
anonymous
Description : Pure inductive circuit takes power from the A.C. line when?
Answer :
It takes power when voltage decreases and current increases.
asked
Mar 25, 2018
by
anonymous
Description : All the rules and laws of D.C. circuit also apply to A.C. circuit containing?
Answer :
All the rules and laws of D.C. circuit also apply to A.C. circuit containing resistance only.
asked
Mar 25, 2018
by
anonymous
Description : what is TCSC?
Answer :
Thyristor Controlled Series Capacitor (TCSC)
Description : A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance to remain constant immediately after the fault, acceleration of the generator rotor is
Answer :
A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance ... , acceleration of the generator rotor is inversely proportional to the moment of inertia of the machine
asked
Apr 29, 2018
by
anonymous
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
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
asked
Apr 29, 2018
by
anonymous
Description : In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C?
Answer :
In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C? 7 V
asked
May 1, 2018
by
anonymous
Description : What is the difference between an AC and DC generator?
Answer :
The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.
asked
Mar 15, 2018
by
anonymous
Description : What is the direction of an AC current?
Answer :
The magnitude and direction of alternating current is changes with respect to time. So for half cycle it is positive and for next half cycle it is negative.
asked
Mar 14, 2018
by
anonymous
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 to step up high voltage signals and provide extra high voltage C) It is a transformer used in power systems to step down extra high voltage signals and provide low voltage D) None of these
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
asked
Apr 29, 2018
by
anonymous
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
asked
Apr 29, 2018
by
anonymous
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
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
asked
Apr 29, 2018
by
anonymous
Description : What are the characteristics of a capacitor?
asked
Mar 15, 2018
by
anonymous
Description : What is the basic function of a capacitor?
asked
Mar 15, 2018
by
anonymous
Description : What is the direction of flow when charging a capacitor?
asked
Mar 15, 2018
by
anonymous
Description : What is the symbol of a capacitor?
Answer :
symbol of a capacitor
asked
Mar 15, 2018
by
anonymous
Description : What is the basic use of capacitor?
asked
Mar 15, 2018
by
anonymous
Description : what is the difference between capacitor and battery ?
Answer :
A capacitor stores power but in very small quantitys and work in D/C and A/C circuits and it needs a power source from wich it gets the power it stores and a battery also stores power but in much larger quantitys measured in Amp/Hours
asked
Oct 3, 2017
by
anonymous
Description : Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.
Answer :
The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller. The principle of ON-OFF control: The on-off control is also called an integral cycle ... control. In phase control, the switch is on for some period of each cycle.
asked
Feb 14, 2018
by
anonymous
Description : Is the power line voltage available in our homes a dc or an ac voltage?
Answer :
The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.
asked
Jun 29, 2019
by
anonymous
Description : In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
Answer :
In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current
asked
Apr 28, 2018
by
anonymous
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.
asked
Sep 2, 2019
by
anonymous
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
asked
Aug 18, 2019
by
anonymous
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
Answer :
Dielectric loss in a capacitor is best measured by Schering Bridge
asked
Apr 25, 2018
by
anonymous
Answer :
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.
asked
Mar 21, 2018
by
anonymous
Answer :
In a ceiling fan employing capacitor run motor secondary winding surrounds the primary winding.
asked
Mar 20, 2018
by
anonymous
Answer :
In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.
asked
Mar 20, 2018
by
anonymous
Answer :
In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.
asked
Mar 20, 2018
by
anonymous
Answer :
In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.
asked
Mar 20, 2018
by
anonymous
Answer :
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.
asked
Mar 20, 2018
by
anonymous
Description : How do you discharge a capacitor in a microwave?
asked
Mar 15, 2018
by
anonymous
Description : The purpose of a parallel circuit resonance is to magnify?
Answer :
The purpose of a parallel circuit resonance is to magnify voltage.
asked
Mar 25, 2018
by
anonymous