E.M.F for a coil depends upon
A. the cross sectional area
B. no. of turns of wire
C. the magnitude of magnetic flux density
D. all of above
all of above
Description : For a straight wire, induced current depends uponA. the speed of movement of wire B. the length of wire C. the magnitude of magnetic flux density D. all of above
Last Answer : all of above
Description : A straight wire of length 0.20 m moves at a steady speed of 3.0 m s-1 at right angles to the magnetic field of flux density 0.10 T. The e.m.f induced across ends of wire is A. 0.5 V B. 0.06 V C. 0.05 V D. 0.04 V
Last Answer : 0.06 V
Description : If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density: A. increases B. decreases C. remains the same D. doubles
Last Answer : If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density: decreases
Description : The current flowing in a coil due to induced emf depends upon: a. shape of coil b. resistance of coil c. area of coil d. magnetic flux
Last Answer : a. shape of coil
Description : Magnitude of induced e.m.f is proportional to A. rate of change of current B. rate of change of voltage C. rate of change of magnetic flux linkage D. rate of change of resistance
Last Answer : rate of change of magnetic flux linkage
Description : Total number of magnetic field lines passing through an area is called A. magnetic flux density B. magnetic flux C. e.m.f D. voltage
Last Answer : magnetic flux
Description : E.M.F can be induced in a circuit by A. changing magnetic flux density B. changing area of circuit C. changing the angle D. all of above
Description : Change in length and cross-sectional area of metal wire changes A. current B. voltage C. resistance D. magnetic effect
Last Answer : resistance
Description : Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10-6 m2 carrying current of 1 A and having number density 8.5 × 1028 m3 is A. 0.015 mm s-1 B. 0.1 mm s-1 C. 0.5 mm s-1 D. 0.25 mm s-1
Last Answer : 0.015 mm s-1
Description : A current of 4.8 A is flowing in a copper wire of cross-sectional area `3xx10^(-4) m^(2)`. Find the current density in the wire.
Last Answer : A current of 4.8 A is flowing in a copper wire of cross-sectional area `3xx10^(-4) m^(2)`. Find the current density in the wire.
Description : A current of 5 ampere is passing through a metallic wire of cross-sectional area `4xx10^(-6) m^(2)`. If the density of the charge-carriers in the wire
Last Answer : A current of 5 ampere is passing through a metallic wire of cross-sectional area `4xx10^(-6) m^(2)`. If the ... ms^(-1)` D. `1xx10^(-2)ms^(-1)`
Description : The spring index is, (A) Ratio of wire diameter to mean coil diameter (B) Force per unit cross-sectional area of spring (C) Ratio of mean coil diameter to wire diameter (D) Force required to produce unit deflection
Last Answer : (C) Ratio of mean coil diameter to wire diameter
Description : The stiffness of spring is, (A) Deflection per unit of axial force (B) Force per unit cross-sectional area of spring (C) Ratio of mean coil diameter to wire diameter (D) Force required to produce unit deflection
Last Answer : (D) Force required to produce unit deflection
Description : Consider the conductor to be a coil of turns 60 and the flux density to be 13.5 units, current 0.12A and area 16units. The torque will be a) 1555.2 b) 1222.5 c) 525.1 d) 255.6
Last Answer : a) 1555.2
Description : Find the total flux in a coil of magnetic flux density 12 units and area 7 units. a) 0.84 b) 0.96 c) 8.4 d) 9.6
Last Answer : a) 0.84
Description : The value of exciting or magnetizing current depends upon which of the following factors ? (a) Total m.m.f. required (b) The number of turns in the exciting winding (c) The way in which the winding is distributed (d) All of the above
Last Answer : (d) All of the above
Description : Current `i` is carried in a wire of length `L`. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field
Last Answer : Current `i` is carried in a wire of length `L`. If the wire is turned into a circular coil, the maximum magnitude ... iB)/(4pi)` D. `(L^(2)B)/(4pi)`
Description : Force on a moving charge in a uniform magnetic field depends uponA. magnetic flux density B. the charge on the particle C. the speed of particle D. all of above
Description : A current of 2 A is flowing through a wire of length 4 m and cross-sectional area `1 mm^(2)`. If each cubic metre of the wire contains `10^(29)` free
Last Answer : A current of 2 A is flowing through a wire of length 4 m and cross-sectional area `1 mm^(2)` ... taken by an electron to cross the length of the wire.
Description : The free electrons of a copper wire of cross-sectional area `10^(-6) m^(2)` acquire a drift velocity of `10^(-4) m//s` when a certain potential differ
Last Answer : The free electrons of a copper wire of cross-sectional area `10^(-6) m^(2)` acquire a drift velocity of `10 ... is `8.5xx10^(28) "electrons"//m^(3)`.
Description : Please ripley me due to emergency
Last Answer : To calculate the flux density in the ring, you need to use the following formula: B = (μ * I * N) / (2 * π * r) where: B is the flux density in the ring (in teslas) μ is the relative permeability ... 2 * π * 0.127 m) = 0.53 T So the flux density in the ring would be approximately 0.53 teslas.
Description : The induced emf in a coil depends upon: a. Strength of magnetic field b. Resistance of the coil c. area of the coil d. All of them
Last Answer : d. All of them
Description : A jet of water of cross-sectional area 20 sq. cm impinges on a plate at an angle of 60? with a velocity of 10 m/sec. Neglecting the friction between the jet and plate (density of water 1000/9.81 kgm-1 sec2 per cubic meter), the ... a.15 - 20 kg b.20 - 25 kg c.5 - 10 kg d.25 - 30 kg e.10 - 15 kg
Last Answer : a. 15 - 20 kg
Description : The frequency of an alternator at a given RPM is determined by the _____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage
Last Answer : Answer: B
Description : One factor that determines the frequency of an alternator is the ____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage
Description : A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will: A. increase B. decrease C. remain constant D. be excessive
Last Answer : A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will: decrease
Description : When field is parallel to plane of area, magnetic flux through coil isA. zero B. infinite C. 2 D. 5
Last Answer : zero
Description : is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in the beam, subjected to a maximum bending moment , is (A) f = (P/A) + (Z/M) ... ) + (M/Z) (C) f = (P/A) + (M/Z) (D) f = (P/A) + (M/6Z)
Last Answer : Answer: Option C
Description : is the pre-stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The minimum stress on the beam subjected to a maximum bending moment is (A) f = (P/A) - (Z/M) (B) f = (A/P) - (M/Z) (C) f = (P/A) - (M/Z) (D) f = (P/A) - (M/6Z)
Description : The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area in m2 , V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3 ) (A) 3.6 AVS.ρ (B) 3.6 A.V.ρ (C) 3.6 A.S. ρ (D) 3.6 AVS/ρ
Last Answer : (A) 3.6 AVS.ρ
Description : The primary turns of a 444 V/222 V, 50 Hz single-phase transformer with a core cross-sectional area of 100 cm2, and a maximum flux density of 1.0 T is (A) 100 (B) 200 (C) 222 (D) 400
Last Answer : The primary turns of a 444 V/222 V, 50 Hz single-phase transformer with a core cross-sectional area of 100 cm2, and a maximum flux density of 1.0 T is 200
Description : The change in flux linkages can be caused in which ofthe following ways ? (a) The flux is constant with respect to time and is stationary and the coil moves through it (b) The coil is stationary with ... above occure together, i.e., the coil moves through a time varying field (d) All ofthe above
Last Answer : (d) All ofthe above
Description : : Moving a coil in and out of magnetic field induces A. force B. potential difference C. e.m.f D. voltage
Last Answer : e.m.f
Description : Induced current in coil by a magnet turns it into an A. straight wire B. magnet C. ammeter D. electromagnet
Last Answer : electromagnet
Description : The introduction of interpoles in between the main pole improves the performance of d.c. machines, because (A) The interpole produces additional flux to augment the developed torque. (B) The flux waveform is ... armature is removed. (D) A counter e.m.f. is induced in the coil undergoing commutation.
Last Answer : Ans: D Counter e.m.f is produced, it neutralizes the reactive emf.
Description : An electron is travelling at right angles to a uniform magnetic field of flux density 1.2 mT with a speed of 8 × 106 m s-1, the radius of circular path followed by electron is A. 3.8 cm B. 3.7 cm C. 3.6 cm D. 3.5 cm
Last Answer : 3.8 cm
Description : 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
Description : A steel wire having cross sectional area 1.2 mm is stretched by a force of 120 N.
Last Answer : A steel wire having cross sectional area 1.2 mm is stretched by a force of 120 N. If a ... is produced in the wire, calculate the Poisson's ratio.
Description : Calculate the work done in stretching a steel wire of length 2m and cross sectional area 0.0225 mm^2
Last Answer : Calculate the work done in stretching a steel wire of length 2m and cross sectional area 0.0225mm2 when a load ... 's modulus of steel= 2 1011 N/m2]
Description : Calculate the electric field in a copper wire of cross-sectional area `2.0 mm^(2)` carrying a current of 1 A. The resistivity of copper `=1.7xx10^(-8)
Last Answer : Calculate the electric field in a copper wire of cross-sectional area `2.0 mm^(2)` carrying a current ... of copper `=1.7xx10^(-8) Omega`m.
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 : A wire is being used as a replacement having twice the length and one-half the cross-sectional area of the original wire. The resistance of this new wire, when compared to that of the original wire, ... B. twice as much C. the same as the original resistance D. one-half of the original resistance
Last Answer : Answer: A
Description : When the length and cross sectional area of a wire are both tripled, the resistance _____________. A. increases nine fold B. increases three fold C. remains the same D. decreases six fold
Last Answer : Answer: C
Description : The standard measuring unit of wire by its cross-sectional area, as used in American wire tables is the _____________. A. AWG B. circular mil C. square millimeter D. cubic inch
Description : The resistance of electric wire will decrease as its _______________. A. length increases B. cross-sectional area increases C. temperature increases D. percent of metallic purities increases
Description : If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be _____________. A. quartered B. unchanged C. doubled D. quadrupled
Description : A replacement wire having twice the length and one-half the cross-sectional area of the original wire will have a resistance that is _____________. A. four times that of the original wire B. twice that of ... wire C. the same as that of the original wire D. one-half that of the original wire
Description : Which solid AWG wire size has the smallest physical cross-sectional area? A. 12 B. 14 C. 16 D. 18
Last Answer : Answer: D
Description : What happens to the resistance of a wire when its length as well as the cross-sectional area are doubled? A) It doubles B) It becomes 4 times C) It becomes 2π times D) It remains the same
Last Answer : Automatically the resistivity will increase as they are the factors affecting the resistivity
Description : Mention the factors on which the magnitude of the e.m.f induced in the transformer depends.
Last Answer : 1) E.m.f in the primary coil 2) Number of turns in the primary coil 3) Number of turns in the secondary coil 4) The core material