The rms value of the current in a wire which carries a d.c. current of 10 A and a sinusoidal alternating current of peak value 20 A is 17.32 A
Description : Alternating current measured in a transmission line will be a) Peak value b) Average value c) RMS value d) Zero
Last Answer : c) RMS value
Description : Current flowing in only one direction is called ___________. A. alternating current B. omnidirectional current C. direct current D. sinusoidal current
Last Answer : Answer: C
Description : If the mean stress value for a sinusoidal stress function is zero, then this type of stress falls in which category? a) Fluctuating Stresses b) Alternating Stresses c) Repeated Stresses d) Reversed Stresses
Last Answer : d) Reversed Stresses
Description : A thick wire of radius `r=5 mm` carries a steady current `I=10 A`. An electron leaves its surface perpendicularly with velocity `v_(0)=10^(6) m//s`. F
Last Answer : A thick wire of radius `r=5 mm` carries a steady current `I=10 A`. An electron leaves its ... from the surface of the wire before it turns back.
Description : A conducting wire of cross-sectional area `1 cm^(2)` has `3 xx 10^(23)` charge carriers per m3. If wire carries a current of `24 mA`, then drift veloc
Last Answer : A conducting wire of cross-sectional area `1 cm^(2)` has `3 xx 10^(23)` charge carriers per m3. If wire carries ... 3)ms^(-1)` D. `5xx10^(-6)ms^(-1)`
Description : The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.
Last Answer : 45
Description : How can a magnetic field be used to generate an electric current?
Last Answer : Magnetic field can be used to generate electric current on a condition that it is on a rate of changing magnetic flux. (Faraday's law)
Description : A long straight wire carries the current along +ve x-direction. Consider four points in space `A(0,1,0), B(0,1,1), C(1,0,1), and D(1,1,1)`. Which of t
Last Answer : A long straight wire carries the current along +ve x-direction. Consider four points in space `A(0,1,0), B(0,1,1) ... B. A and C C. B and C D. B and D
Description : Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a current of 2 A. Atomic mass of silver=108 a
Last Answer : Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a ... silver `=10.5xx10^(3) kg//m^(3)`.
Description : Two identical conducting wires `AOB and COD` are placed at right angles to each other. The wire `AOB` carries an electric current `I_(1) and COD` carr
Last Answer : Two identical conducting wires `AOB and COD` are placed at right angles to each other. The wire `AOB` carries an electric ... )^(2)+I_(2)^(2))^(1//2)`
Description : A long straight wire along the `z`- axis carries a current ` I` in the negative ` z- direction` . The magnetic vector field ` vec(B)` at a point havin
Last Answer : A long straight wire along the `z`- axis carries a current ` I` in the negative ` z- direction` . The magnetic ... -yhat(j)))/(2pi(x^(2)+y^(2)))`
Description : A length of wire carries a steady current. It is first bent to form a circular coil of one turn. The same length is now bent more sharply to give a lo
Last Answer : A length of wire carries a steady current. It is first bent to form a circular coil of one turn. ... ots first value D. two times of its first value
Description : Two infinitely long, thin, insulated, straight wires lie in the x-y plane along the x- and y- axis respectively. Each wire carries a current I, respec
Last Answer : Two infinitely long, thin, insulated, straight wires lie in the x-y plane along the x- and y- axis respectively. Each ... x C. y = x-1 D. y = -x+1
Description : A silver wire of radius `0.1 cm` carries a current of 2A. If the charge density in silver is `5.86xx10^(28)m^(-3)`, then the drif velocity is
Last Answer : A silver wire of radius `0.1 cm` carries a current of 2A. If the charge density in silver is `5.86xx10^(28)m^(- ... -4)ms^(-1)` D. `7xx10^(-4)ms^(-1)`
Description : A wire of 50 cm long, `1mm^(2)` in cross-section carries a current of 4 A, when connected to a 2 V battery, the resistivity of wire is
Last Answer : A wire of 50 cm long, `1mm^(2)` in cross-section carries a current of 4 A, when connected to a 2 V ... `4xx10^(-6)Omega-m` D. `1xx10^(-6)Omega-m`
Description : An infinitely long wire carries a current of three amps. The magnetic field outside the wire: w) points radially away from the wire x) points radially inward y) circles the wire z) is zero.
Last Answer : ANSWER: Y -- CIRCLES THE WIRE
Description : In a metal wire, which particle carries electric current?
Last Answer : In a metal wire the particles responsible for carrying electric current are holes.
Description : The r.m.s. value of a half-wave rectified alternating current is 10 A. Its value for full-wave rectification will be
Last Answer : The RMS value of a half-wave rectified current is 10 Ampere. Its value for full-wave rectification would be: 14.14 Ampere
Description : The RMS value of a sine-wave current may also be expressed as the _____________. A. average value B. maximum value C. effective value D. instantaneous value
Description : The current drawn by the line due to corona losses is (a) non-sinusoidal (b) sinusoidal (c) triangular (d) square
Last Answer : (a) non-sinusoidal
Description : 32 With S2 closed and S1 open, the current waveform in the delta winding will be [GATE 2009] A. a sinusoidal at fundamental frequency B. flat-topped with third harmonic C. only third-harmonic D. none of these
Last Answer : C. Only third harmonic
Description : Describe the operation of inductor with sinusoidal AC voltage as input. Draw waveform for voltage across and current through the inductor. Draw its phasor representation.
Last Answer : An alternating voltage is applied to a purely inductive coil, a back e.m.f. is produced due to self-inductance of the coil. The back e.m.f. at every step, opposes the rise of fall of current through the coil ... drop, the applied voltage has to overcome this self induced e.m.f. only.
Description : Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured? A. Peak value B. Root-mean-square value C. Average value D. Maximum value
Last Answer : Answer: B
Description : Average power dissipated in resistor if sinusoidal p.d of peak value 25 V is connected across a 20 Ω resistor is A. 15.6 W B. 15 W C. 16 W D. 17 W
Last Answer : 15.6 W
Description : The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is (A) 3.2 µH (B) 3.2 mH (C) 32.0 mH (D) 3.2 H
Last Answer : The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter is 32.0 mH
Description : How is electromagnetism used today?
Last Answer : The base of electrical engineering is electromagnetism. You found electromagnetism everywhere in a electrical devices around you.
Description : A sinusoidally alternating current of frequency 60 Hz has a maximum value of 15 A. Find the value of current after 1/200 second
Last Answer : A sinusoidally alternating current of frequency 60 Hz has a maximum value of 15 A. Find the value of current after 1/200 second
Description : When a megohmmeter is being used on a alternating current machine, the meter pointer will dip toward 'zero' and then gradually rise to the true resistance value if the motor insulation is _____________. A. grounded B. good C. shorted D. dirty
Description : In the case of an unsymmetrical alternating current the average value must always be taken over?
Last Answer : In the case of an unsymmetrical alternating current the average value must always be taken over the whole cycle.
Description : A long wire carries a steady curent . It is bent into a circle of one turn and the magnetic field at the centre of the coil is `B`. It is then bent in
Last Answer : A long wire carries a steady curent . It is bent into a circle of one turn and the magnetic field at the centre of ... ^(2)B` C. `2nB` D. `2n^(2)B`
Description : A magnetic circuit has effective iron length of 100 cm and it is wound with 800 turns of wire carries 1 A. Find the magnetic field strength.
Last Answer : magnetic field strength
Description : An iron ring of mean circumference 80 cm is uniformly wound with 500 turns of wire and carries 0.8A. Find the magnetic field strength.
Last Answer : Ans: Magnetic field strength H = NI /l = 500 x 0.8 / 80 x 10-2 = 500 AT/m
Description : 3. Which sources produce alternating current? -Physics-10
Last Answer : Power plants and AC generators are some of the sources that produce alternating current.
Description : The reactance offered by a capacitor to an alternating current of frequency 50 Hz is 10 ohm. If frequency is increased to 100 Hz, the reactance will be (a) 2.5 ohm (b) 5.0 ohm (c) 20.0 ohm (d) 40.0 ohm
Last Answer : Xc = 1/(2*pi*f*c) so when f is double .... Xc will be half ... Ans is 5ohm
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 : Explain in brief AC Current , RMS Indication using Hall Effect Transducer.
Last Answer : When an ac current passes through the conductor it sets up a magnetic field around the conductor. This magnetic field is proportional to the current. A Hall Effect Transducer is placed in a ... flowing in the conductor. In this way, the current is measured using the Hall effect transducer.
Description : A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is
Last Answer : Please show the solution for this question
Description : If the rms voltage drop across a 15 kilt resistor is 16 V, the peak current through the resistor is : - a) 15 mA b) 1.5 mA c) 10 mA d) 1 mA
Last Answer : If the rms voltage drop across a 15 kilt resistor is 16 V, the peak current through the resistor is : - 1.5 mA
Description : What is RMS value ?
Last Answer : If a certain amount of heat is generated in a certain amount of DC current flows through a certain register at a certain time , if the same amount of heat is generated in the current flowing through the ... at the same time, then that DC current is called the effective or RMS value of AC current.
Description : What does the Voltmeter in AC mode show? Is it RMS value or peak value?
Last Answer : Multimeter in AC mode shows RMS value of the voltage or current. Also when it is DC mode it will show the RMS value only.
Description : Find the power of a wave given that the RMS value of E and H are 6 and 4.5 respectively. a) 24 b) 27 c) 29 d) 32
Last Answer : b) 27
Description : Ordinary postage stamps, coins and other articles of valued found in letter boxes or on a counter the action taken by postmaster is a) When ordinary stamp are found in letter box will have been ... articles mentioned above the refund value should be submitted for order of HOD. e) All the above
Last Answer : e) All the above
Description : In a half wave rectifier the rms value of AC component of the waves (a) Zero (b) Equal to DC value (c) More than DC value (d) Less than DC value
Last Answer : b) Equal to DC value
Description : 6 The value of flux involved in the emf equation of a transformer is A. rms value B. rms value C. Maximum value D. Instantaneous value
Last Answer : C) maximum value
Description : Write the relation between RMS value and Average value.
Last Answer : The ratio of RMS value to average value is called the form factor of an alternating quantity.
Description : Define RMS value and Average value of AC waveform.
Last Answer : 1. RMS value:- For an alternating current, the RMS value is defined as that value of steady current (DC) which produces the same heat or power as is produced by the alternating current during the ... by averaging all the instantaneous values of its wave over a period of half cycle. Iav=0.637 Imax
Description : Define following terms used in A.C. circuits : (i) Cycle (ii) Rms value (iii) Phase difference (iv) Average value
Last Answer : (i) Cycle: A complete set of variation of an alternating quantity which is repeated at regular interval of time is called as a cycle. OR Each repetition of an alternating quantity ... charge as is transferred by the alternating current during the same time under the same conditions.
Description : Define : i) Maximum Value ii) RMS Value of ac supply
Last Answer : i) Maximum Value :- The maximum or peak value attained by an alternating quantity during positive or negative half cycle, is called maximum value or peak value. ii) RMS Value of ac ... as produced by the alternating current when flowing through the same resistance and for the same time.
Description : Define : i) Average value ii) RMS value of an AC Wave.
Last Answer : i) Average value: The average value is defined as the average of all instantaneous values during one alternation . That is, the ratio of the sum of all considered instantaneous values to the ... as produced by the alternating current when flowing through the same resistance for the same time.
Description : RMS value formula
Last Answer : RMS value formula