Which of the following statements concerning AC circuits is correct? A. The power factor of a resistive circuit is always zero. B. True power in an inductive circuit always equals apparent power. ... . D. Total opposition to the flow of alternating current depends upon the amount of reactive power.
Last Answer : Answer: C
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The basic control action of a magnetic amplifier depends upon _____________. A. variations in the load capacitance B. changes in inductance C. type of core material D. construction of the core
Last Answer : Answer: B
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1 answer
Over lap Angle depends on_________ a) Load inductance b) Loa capacitance c) Source inductance d) Source capacitance
Last Answer : Ans: Source inductance
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The mutual inductance of the coil depends upon: a. density of the coil b. stiffness of coil c. material of coil d. geometry of the coil
Last Answer : d. geometry of the coil
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asked
Aug 4, 2021
by
anonymous
Mutual inductance between two magnetically coupled coils depends on (a) number of turns only (b) permeability of the core only (c) cross-sectional area of their common core only (d) All of the above
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May 25, 2018
by
anonymous
Three factors responsible for the change in voltage as load is applied to an AC generator are: 1) the drop in resistance in the armature circuit, 2) the change in flux, and 3) the ____________. A. armature winding speed B. inductance load drop C. coil pitch factor D. armature reactance voltage drop
Last Answer : Answer: D
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. What are two of the three physical factors that determine the values of capacitance and inductance of a transmission line?
Last Answer : (1) Type of line used, (2) dielectric in the line, and (3) length of line.
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33 views
1 answer
asked
Aug 20, 2021
by
anonymous
Write any two factors on which earth resistance depends.
Last Answer : Factors on which earth resistance depends: (1) The shape and material used for the electrode (2) Depth of the electrode in the ground. (3) The specific resistance of the soil around the electrode (4) Moisture content in the soil. (5) Nature of soil
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294 views
1 answer
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Sep 6, 2018
by
anonymous
Write the factors on which capacity of parallel plate condenser depends.
Last Answer : Factors on which capacity of parallel plate condenser depends : A = Area of each plate d= Distance between two plate k = Dielectric constant of the medium ε0 = Permittivity of free space
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Sep 4, 2018
by
anonymous
effect of inductance and capacitance on performance of transmission line.
Last Answer : Following are the effect on performance of transmission line: 1. Due to inductance (L) voltage drop in transmission line produces. 2. Capacitor (C) draws charging current ... , transmission line efficiency, voltage regulation & also power factor of transmission line gets affected.
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1 answer
asked
Aug 25, 2019
by
anonymous
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What is inductance?
Last Answer : Inductance is the property of Material by which it opposes the any change of magnitude or direction of electric current passing through the conductor. The inductance is denoted by L. The unit of inductance is Henry (H).
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Jul 4, 2019
by
anonymous
Self inductance formula
Last Answer : Self inductance formula
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Jun 11, 2019
by
anonymous
Self induced voltage across an inductance
Last Answer : Self induced voltage across an inductance
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Jun 11, 2019
by
anonymous
115 views
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Nov 12, 2018
by
anonymous
State the effects of errors in dynamometer type wattmeter due to i) pc- inductance ii) pc- capacitance iii) mutual inductance iv) Connection.
Last Answer : Errors in wattmeter: i) pc - inductance: Pressure coil inductance causes wattmeter to read more power than actual . ii) pc-capacitance: The wattmeter reads less power. iii) ... iv) Connection: In uncompensated wattmeter , the reading of wattmeter includes the powerloss in coils.
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Sep 6, 2018
by
anonymous
Describe with working of LCR meter for measurement of inductance.
Last Answer : working of LCR:- A LCR meter (Inductance (L), Capacitance (C), and Resistance (R) test equipment used to measure the inductance, capacitance and, resistance of a component. It works on the ... in parallel (as would be encountered in measuring a capacitor with a leaky dielectric) [Q setting ]
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1 answer
asked
Sep 6, 2018
by
anonymous
Define :i) Self inductance ii) Coefficient of self induction
Last Answer : i) Self-inductance: It is the property by virtue of which a coil opposes change in current flowing through it by inducing an emf in it such that its effect is to circulate current (induced current) that produces a magnetic field ... N = di/dt N = Φ/I It is expressed in henry.
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Sep 4, 2018
by
anonymous
A coil of 500 turns is linked with a flux of 25 mwb, when carries a current of 12.5A. Calculate the value of self-inductance.
Last Answer : Ans: Self-Inductance: L = NΦ /I = 500 × 25 × 10-3 / 12.5 = 1 H
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Sep 2, 2018
by
anonymous
In practice, a current source inverter consists of an AC/ DC converter with a large inductance ‘L’ in the output. This inductance maintains a ……… …………through the switching devices over short interval of time. A) constant current B) constant voltage C) constant power D) none of the (A), (B), (C)
Last Answer : In practice, a current source inverter consists of an AC/ DC converter with a large inductance ‘L’ in the output. This inductance maintains a constant current through the switching devices over short interval of time.
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asked
Jun 17, 2018
by
anonymous
An iron cored inductance coil can be modelled, over a normal operating range of networks ,as A) non-Linear bilateral element B) linear bilateral element C) linear time varying element D) non-linear time invariant element
Last Answer : An iron cored inductance coil can be modelled, over a normal operating range of networks ,as linear bilateral element
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1 answer
asked
May 24, 2018
by
anonymous
These self inductance of a circuit is defined as twice the work done against the induced e.m.f. on establishing unit current in the coil. If the current to be established in the coil is doubled, the work done ... induced e.m.f. will be 1. Doubled 2. Halved 3. four times 4. Quarter times
Last Answer : These self inductance of a circuit is defined as twice the work done against the induced e.m.f. on establishing unit current in the coil. If the current to be established in the coil is doubled, the work done against the induced e.m.f. will be four times
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79 views
1 answer
asked
May 13, 2018
by
anonymous
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lt the length, number of turns and area of a coil are doubled, the inductance of the coil
Last Answer : lt the length, number of turns and area of a coil are doubled, the inductance of the coil is quadrupled
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1 answer
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Apr 26, 2018
by
anonymous
A coil of inductance 240 mH and resistance 75 Ohm is connected in parallel with a capacitor across a 30 V, variable frequency supply. The current drawn by the circuit is found to be minimum when the supply frequency is 1 kHz. The ... (A) 40, 400 Hz (B) 10, 100 Hz (C) 20, 50 Hz (D) 50, 20 Hz
Last Answer : A coil of inductance 240 mH and resistance 75 Ohm is connected in parallel with a capacitor across a 30 V, variable frequency supply. The current drawn by the circuit is found to be minimum ... supply frequency is 1 kHz. The approximate values of Q-factor and bandwidth are, respectively 20, 50 Hz
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asked
Apr 25, 2018
by
anonymous
A network consists of several inductances connected in parallel. The equivalent inductance of the network is given by (A) the sum of the individual inductances. (B) the reciprocal of the ... of individual inductances. (D) the reciprocal of the sum of reciprocals of individual inductances.
Last Answer : A network consists of several inductances connected in parallel. The equivalent inductance of the network is given by the reciprocal of the sum of reciprocals of individual inductances.
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1 answer
asked
Apr 25, 2018
by
anonymous
What is the value of Inductance of a coil that induces 20 V when the current through the coil changes from 12 to 20 A in 2 seconds? A. 2 H B. 3 H C. 4 H D. 5 H
Last Answer : 5 H is the value of Inductance of a coil that induces 20 V when the current through the coil changes from 12 to 20 A in 2 seconds.
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1 answer
asked
Apr 12, 2018
by
anonymous
A 220 kV, 3 phase transmission line is 60 km long. The resistance is 0.15 ohm / km and the inductance is 1.4 mH / km. Use the short line model to find the power at the sending end when the line is supplying a three ... at 0.8 pf lagging at 220 kV. (A) 5.58MW (B) 80MW (C) 85.58MW (D) 74.42 MW
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asked
Apr 5, 2018
by
anonymous
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A parallel combination of capacitance C and resistance R is connected in series with inductance L and small resistance r. Under what condition will the circuit be non-reactive? (A) C=LR (B) C=LR2 (C) C=L/R2 (D) C=L/R
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Apr 5, 2018
by
anonymous
The current i(t), through a 10 Ω resistor in series with an inductance, is given by I(t) = 3 + 4sin (100t + 450 ) + 4 sin(300t +600) amperes. The RMS values of the current and power dissipation ... respectively (B) √35 A, 350 W respectively (C) 5 A, 250 W respectively (D) 11 A, 1210 W respectively
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asked
Apr 5, 2018
by
anonymous
A three phase 50 Hz, 400 kV transmission line is 300 km long. The line inductance is 0.97 mH/km per phase and capacitance is 0.0115 mF/km per phase. Assume a loss less line. Determine the line wavelength (a line phase constant). (A) 1250 km (B) 6578 km (C) 4990 km (D) 2445 km
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Apr 5, 2018
by
anonymous
A choke coil having resistance RΩ and of inductance L Henry is shunted by a capacitor of C farads. The dynamic impedance of the resonant circuit would be: (A) R/LC (B) C/RL (C) L/RC (D) 1/RLC
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Apr 5, 2018
by
anonymous
The differential coupling of two coils in series connection has self-inductance of 2 mH & 4 mH & a mutual inductance of 0.15 mH. The equivalent inductance of the combination is: (A) 5.7 mH (B) 5.85 mH (C) 6 mH (D) 6.15 mH
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Apr 5, 2018
by
anonymous
Last Answer : An undesirable side effect of motional inductance of large conduction specimens is eddy currents.
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Apr 1, 2018
by
anonymous
A series RLC circuit has a resistance of 50 , inductance of 0.4H and a capacitor of 10µF. The circuit is connected across a 100V supply. The resonance frequency and the current through the resistance are
Last Answer : A series RLC circuit has a resistance of 50 , inductance of 0.4H and a capacitor of 10µF. The circuit is connected across a 100V supply. The resonance frequency and the current through the resistance are 500 rad/s and 2A.
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1 answer
asked
Mar 31, 2018
by
anonymous
Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The mutual inductance M is
Last Answer : Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The mutual inductance M is 0.5 mH.
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1 answer
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Mar 28, 2018
by
anonymous
Last Answer : Inductance coils are basically designed for High Q.
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1 answer
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Mar 28, 2018
by
anonymous
The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs.
Last Answer : The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is 20 Vs
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271 views
1 answer
asked
Mar 25, 2018
by
anonymous
When both the inductance and resistance of a coil are doubled the value of?
Last Answer : When both the inductance and resistance of a coil are doubled the value of time constant remains unchanged.
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230 views
1 answer
asked
Mar 25, 2018
by
anonymous
The inductance of a coil can be increased by?
Last Answer : The inductance of a coil can be increased by choosing core material having high relative permeability.
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304 views
1 answer
asked
Mar 25, 2018
by
anonymous
If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be?
Last Answer : 0.1s
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2 answers
asked
Mar 25, 2018
by
anonymous
Inductance of coil?
Last Answer : Inductance of coil increases with the increase in supply frequency.
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1 answer
asked
Mar 25, 2018
by
anonymous
Inductance of a coil Varies?
Last Answer : Inductance of a coil Varies as directly as the cross-sectional area of magnetic core and inversely as the length of the iron path.
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1 answer
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Mar 25, 2018
by
anonymous
Inductance affects the direct current flow?
Last Answer : Inductance affects the direct current flow at the time of turning on and off.
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138 views
1 answer
asked
Mar 25, 2018
by
anonymous
In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value?
Last Answer : In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value will increase the selectivity of the circuit.
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776 views
1 answer
asked
Mar 25, 2018
by
anonymous
Last Answer : Resistance: This could be defined as the opposition or retarding force to the flow of current in a circuit. It is measured in Ohms. Capacitance: The ability of a system of electrical conductors and insulators ... due to a rate of change of current in the circuit or coil. It's unit is Henry.
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1 answer
asked
Feb 22, 2018
by
Shweta Kherde
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What is the reciprocal of inductance?
Last Answer : This term is not exist
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1 answer
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Jan 7, 2018
by
anonymous
Last Answer : Unit of inductance is Henry denoted by capital H .
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1 answer
asked
Sep 20, 2017
by
anonymous
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Last Answer : The size of the induced electromotive force is proportional to the rate of change of theelectric current. ... The self-inductance of a coil, or simply its inductance, may thus be thought of as electromagnetic inertia, a property that opposes changes both in currents and in magnetic fields.
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1 answer
asked
Sep 18, 2017
by
anonymous
Last Answer : The voltage across an inductor is directly proportional to inductance (V=L*di/dt*I).And the voltage is Also directly proportion to frequency.
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1 answer
asked
Sep 18, 2017
by
anonymous
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If the size of the elements is small, the final solution is expected to be accurate. a.more b.less c.depends on other factors d.can't say
Last Answer : a.more
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1 answer
asked
Feb 6
by
anonymous
Mention the factors on which the land-use pattern of India depends on. -Geography
Last Answer : There are two main factors on which the land use pattern of India depends upon. The factors are- Physical factors and Human factors : 1. Physical factors: The physical factors ... factors: The human factors comprise population density, culture, and traditions, technological capability, etc.
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asked
Feb 3
by
anonymous
