asked
Jan 7, 2018
by
anonymous

**Description :** Reciprocal of reluctance is?

**Last Answer :** Reciprocal of reluctance is permeance.

**Description :** What is the reciprocal of capacitance?

**Last Answer :** The reciprocal of capacitance is called elastance, and its unit is the reciprocal farad, also called the daraf.

**Description :** What is the reciprocal of resistivity?

**Last Answer :** conductivity, mho

**Description :** what is the reciprocal of admittance?

**Last Answer :** impedance is the reciprocal of admittance.

**Description :** what is the reciprocal of reactance?

**Last Answer :** reciprocal of reactance is susceptance.

**Description :** Conductance is reciprocal of?

**Last Answer :** Conductance is reciprocal of resistance.

**Description :** 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.

**Description :** 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).

**Description :** Self induced voltage across an inductance

**Last Answer :** Self induced voltage across an inductance

**Description :** 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 ]

**Description :** 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

**Description :** 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

**Description :** 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.

**Description :** 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.

**Description :** Inductance of coil?

**Last Answer :** Inductance of coil increases with the increase in supply frequency.

**Description :** 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.

**Description :** Inductance affects the direct current flow?

**Last Answer :** Inductance affects the direct current flow at the time of turning on and off.

**Last Answer :** Unit of inductance is Henry denoted by capital H .

**Description :** State the impact of inductance and resistance on transmission line performance

**Last Answer :** Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected

**Description :** For 11kV line the inductance per km per phase will be of the order of: (A) 1 H (B) 0.1 H (C) 1 mH (D) 0.1 mH

**Last Answer :** For 11kV line the inductance per km per phase will be of the order of: 1 mH

**Description :** The self inductance of a coil can be measured using (A) Wien’s Bridge (B) Schering Bridge (C) Anderson’s Bridge (D) Wheatstone Bridge

**Last Answer :** The self inductance of a coil can be measured using Anderson’s Bridge

**Description :** The bridge method commonly used for finding mutual inductance is (A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge

**Last Answer :** The bridge method commonly used for finding mutual inductance is Heaviside Campbell bridge

**Last Answer :** If an inductance is connected in one arm of bridge and resistances in the remaining three arms the bridge cannot be balanced.

**Last Answer :** For measurement of inductance having high value, we should use Hay's bridge.

**Last Answer :** For measurement of mutual inductance we can use Heaviside bridge.

**Last Answer :** In an Anderson bridge, the unknown inductance is measured in terms of known capacitance and resistance.

**Description :** An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

**Last Answer :** An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, both resistance and inductance carry equal currents.

**Description :** Reciprocal of resistivity is called a. Resistance b. Inductance c. Conductivity d. Flexibility

**Last Answer :** c. Conductivity

**Description :** For a two -port reciprocal network, the three transmission parameters are A = 4, B = 7 and C = 5. What is the value of D ? (a) 9.5 (b) 9.0 (c) 8.5 (d) 8.0

**Last Answer :** For a two -port reciprocal network, the three transmission parameters are A = 4, B = 7 and C = 5. What is the value of D ? (a) 9.5 (b) 9.0 (c) 8.5 (d) 8.0

**Last Answer :** Reciprocal of conductivity is resistivity.

**Description :** what is the reciprocal of resistance ?

**Last Answer :** reciprocal of resistance is conductance.

**Description :** 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.

**Description :** 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.

**Description :** 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

**Description :** 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.

**Description :** 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

**Description :** 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

**Description :** 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

**Description :** 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.

**Description :** 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.

**Last Answer :** An undesirable side effect of motional inductance of large conduction specimens is eddy currents.

**Description :** 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.

**Description :** 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.

**Last Answer :** Inductance coils are basically designed for High Q.

**Description :** 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

**Description :** 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.

**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.

**Last Answer :** 1)no of turns 2)area of coil 3)length of coil 4)thickness of conductor