Description : A straight round copper conductor of radius `R = 5.0 mm` carries a current `I = 50 A` Find the potentail difference between the axis of the conductor
Last Answer : A straight round copper conductor of radius `R = 5.0 mm` carries a current `I = 50 A` Find the potentail difference ... to `n = 0.9.10^(33) cm^(-3)`.
Description : A compression spring is made of music wire of 2 mm diameter having a shear strength and shear modulus of 800 Mpa and 80 Gpa respectively. The mean coil diameter is 20mm, free length is 40 mm, and the number ... by 8 times b. decreased by 2 times c. increased by 2 times d. decreased by 8 times
Last Answer : a. increased by 8 times
Description : The maximum shear stress in spring wire is induced at (A) Inner surface of the coil (B) Outer surface of the coil (C) Central surface of the coil (D) End coils
Last Answer : (A) Inner surface of the coil
Description : Two bodies of equal mass are moving in circular paths at equal speed. The first body moves in a circle whose radius is twice as great as that of the second. The ratio of the centripetal or radial acceleration of the first body to that of the second is: w) 1 to 4 x) 1 to 3 y) 1 to 2 z) 1 to 1
Last Answer : ANSWER: Y -- 1 TO 2
Description : How many bottles are in each group when 1700 bottles of water arranged into 4 groups with the 2nd group having 20 more than the 1st the 3rd twice the 2nd and the 4th 10 more than the 3rd?
Last Answer : let the number of bottles in the first group be BThenthe 2nd group has 1st + 20 = B + 20 bottles;the 3rd group has 2nd Ã- 2 = 2 Ã- (B + 20) = 2B + 40 bottles;the 4th group has 3rd + ... = 580 bottlesChecking: 265 + 285 + 570 + 580 = 1700 The groups contain 265, 285, 570 and 580 bottles respectively.
Description : If coil 'R1-R2' on the transmitter in figure 'A' shown in the illustration is turned 30 degrees clockwise, corresponding coil 'R1-R2' on the receiver should ____________. EL-0092 A. make coils 'S1 ... a higher voltage depending on the turns ratio D. align itself to the same position if free to move
Last Answer : Answer: D
Description : The length of a wire is increased by 1 mm on the application of a certain load. In a wire of the same material but of twice the length and half the radius, the same force will produce an elongation of (a) 0.5 mm (b) 2 mm (c) 4 mm (d) 8 mm
Last Answer : (d) 8 mm
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 uniform wires `A` and `B` are of the same total metal and have equal masses. The radius of wire `A` is twice that of wire `B`. The total resistanc
Last Answer : Two uniform wires `A` and `B` are of the same total metal and have equal masses. The radius of ... `5Omega` when the resistance of wire B is `4Omega`
Description : A circular coil of radius `10 cm "and" 100` turns carries a current 1A. What is the magnetic moment of the coil?
Last Answer : A circular coil of radius `10 cm "and" 100` turns carries a current 1A. What is the magnetic moment of the coil? A. ... 3,142 A-m^(2)` D. `3 A-m^(2)`
Description : The magnetic field at the centre of a circular coil of radius `r` carrying current `l` is `B_(1)`. The field at the centre of another coil of radius `
Last Answer : The magnetic field at the centre of a circular coil of radius `r` carrying current `l` is `B_(1)`. The field at the ... `1//2` B. `1` C. `2` D. `4`
Description : A circular coil of `20turns` and radius `10cm` carries a current of `5A`. It is placed in a uniform magnetic field of `0*10T`. Find the torque acting
Last Answer : A circular coil of `20turns` and radius `10cm` carries a current of `5A`. It is placed in a uniform magnetic ... Nm B. 3.14 Nm C. 0.314 Nm D. zero
Description : A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be `(1//8)^(th
Last Answer : A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the ... 2//sqrt(3))R` D. `R//2sqrt(3)`
Description : The magneitc field produced at the center of a current carrying circular coil of radius r, is
Last Answer : The magneitc field produced at the center of a current carrying circular coil of radius r, is A. directly ... 2)` D. inversely proportional to `r^(2)`
Description : When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is `B_(1)` If
Last Answer : When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to ... 1)` C. `3B_(1)` D. `27B_(1)`
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 : A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the deflection of the coil is (A) WR3n/Cr4 (B) 2WR3n/Cr4 (C) 3WR3n/Cr4 (D) 4WR3n/Cr
Last Answer : (D) 4WR3n/Cr
Description : A closely coiled helical spring of radius R, contains n turns and is subjected to an axial loadW. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the stress developed in the helical spring is (A) WR/ 3 (B) 2WR/ 3 (C) 2WR/ 2 (D) 4WR/ 2
Last Answer : (B) 2WR/ 3
Description : A circular flexible loop of wire of radius r carrying a current I is placed in a uniform magnetic field B . If B is doubled, then tension in the loop
Last Answer : A circular flexible loop of wire of radius r carrying a current I is placed in a uniform magnetic field ... is doubled C. is halved D. becomes 4 times
Description : An electric current I enters and leaves a uniform circular wire of radius a through diametrically opposite points. A charged paricle q moving along th
Last Answer : An electric current I enters and leaves a uniform circular wire of radius a through diametrically opposite points. A ... `qv(mu_(0)i)/(a)` D. zero
Description : A current `i` ampere flows in a circular arc of wire whose radius is `R`, which subtend an angle `3pi//2` radian at its centre. The magnetic induction
Last Answer : A current `i` ampere flows in a circular arc of wire whose radius is `R`, which subtend an angle `3pi//2` radian at ... 0)i)/(R )` D. `3mu_(0)i)/(8R)`
Description : The close-coiled helical springs ‘A’ and ‘B’ are of same material, same coil diameter, same wire diameter and subjected to same load. If the number of turns of spring ‘A’ is half that of spring ‘B’, the ratio of deflection of spring ‘A’ to spring ‘B’ is (a)1/2 (b) 1 (c) 2 (d) 4
Last Answer : (a)1/2
Description : Two concentric circular coils of ten turns each are situated in the same plane. Their radii are `20` and `40 cm` and they carry respectively `0.2` and
Last Answer : Two concentric circular coils of ten turns each are situated in the same plane. Their radii are `20` and `40 cm` ... /80)mu_(0)` D. `(25//2)mu_(0)`
Description : The voltage across a coil, when di/dt = 20 mA/s and L = 8 H, is: A. 16 mV B. 160 mV C. 1.6 mV D. 2.5 mV
Last Answer : The voltage across a coil, when di/dt = 20 mA/s and L = 8 H, is: 160 mV
Description : Figure shows three cases: in all case the circular part has radius r and straight ones are infinitely long. For the same current the ratio of field B
Last Answer : Figure shows three cases: in all case the circular part has radius r and straight ones are infinitely long. For the same ... /(4)):((3pi)/(4)+(1)/(2))
Description : A motor bike tyre has two punctures. The 1st puncture alone would have made the tyre flat in 27 minutes and the 2nd alone would have done it in 18 minutes. If air leaks out at a constant rate, how long does it take ... flat? a) 20 4/3 minutes b) 15 4/7 minutes c) 10 4/5 minutes d) 25 4/3 minutes
Last Answer : C 1st puncture made the tyre flat in 27 mins 2nd puncture made the tyre flat in 18 mins 1 minute’s work of both the punctures = (1/27 + 1/18) =(2+3)/54 =5/54 So, both the punctures will make the tyre flat in 54/5 mins =>10 4/5 minutes
Description : Two coils have a mutual inductance 0.005H. The current changes in the first coil according to the equation `I=I_(0) sin omegat "where" I_(0)=10A and o
Last Answer : Two coils have a mutual inductance 0.005H. The current changes in the first coil according to the equation `I ... (pi//x)` volts. Find the value of x.
Description : If two coils are wound on a single iron core, what will a change in current in one coil cause in the other coil?
Last Answer : A change in inductance.
Description : The distance between the starts of two consecutive coils measured in terms of coil sides is called (a) front pitch (b) winding pitch (c) commutator pitch (d) back pitch
Last Answer : (b) winding pitch
Description : The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils? (1) 3.54 mH (2) 7.88 mH (3) 39.9 mH (4) 189.3 mH
Last Answer : The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. 39.9 mH is the mutual inductance between the coils.
Description : An AC circuit consists of a resistance and a choke coil in series . The resistance is of 220 `Omega` and choke coils is of 0.7 H . The power abosorbed
Last Answer : An AC circuit consists of a resistance and a choke coil in series . The resistance is of 220 ` ... 50 Hz , source connected with the circuit , is
Description : Air gap readings should be taken periodicly on electrical generation equipment to __________. A. determine the amount of varnish that can be applied to correct insulation problems B. determine the ... field coil bolts and correct lateral adjustment of the field coils D. increase machine efficiency
Last Answer : Answer: B
Description : When troubleshooting motor controllers, a shorted relay or contactor coil is often indicated by _______________. A. a resistance reading of 'infinity' on an ohmmeter B. charred insulation and/or a blown ... of the coil's leads to ground D. a higher-than-normal voltage reading across the winding
Description : Excessive humming of AC contactors may be caused by ______________. A. burnt arc shields B. shorted armature coils C. a broken shading coil D. high voltage
Last Answer : Answer: C
Description : Shading coils are installed on AC full-voltage starters to _____________. A. eliminate contact chatter B. dissipate opening contact arcs C. delay current build up in the holding coil D. protect the motor windings from momentary starting current overload
Last Answer : Answer: A
Description : A low voltage source is being used for testing armature coils. A coil short circuit will be indicated by a _______. A. high voltage reading, while the other coil readings will have an ... the other coil readings are steady D. steady voltmeter reading, while the other coil readings are fluctuating
Description : If uncompressed length of spring is 40mm and number of coils 10mm, then pitch of coil is? a) 4 b) 40/9 c) 40/11 d) None of the mentioned
Last Answer : b) 40/9
Description : DC relay coil or contactor coils must be connected to which side?
Last Answer : Negative side of the DC supply to avoid galvanic effect on the coil, which will corrode the coil.
Description : A close coil helical spring of mean diameter D consists of n coils of diameter d. If it carries an axial load W, the energy stored in the spring, is (A) 4WD²n/d 4N (B) 4W²Dn/d 4N (C) 4W²D3n/d 4N (D) 4W²D3n²/d 4N
Last Answer : (C) 4W²D3n/d 4N
Description : A close coil helical spring when subjected to a moment M having its axis along the axis of the helix (A) It is subjected to pure bending (B) Its mean diameter will decrease (C) Its number of coils will increase (D) All the above
Last Answer : (A) It is subjected to pure bending
Description : The windings of the electromagnetic are usually called: a. Magnetic coils b. Field coil c. Electric coil d. simple coil
Last Answer : c. Electric coil
Description : Pradeesh gets a chance of 40% to win 1st round of a game and a Priya gets a chance of 55% to win 2nd round of the game. In what % of cases are they likely to contradict each other, narrating the same incident? a) 49% b) 54% c) 51% d) 38%
Last Answer : Answer: C) Let A be the event that a pradeesh wins 1st round Let B be the event that a priya wins 2nd round. Then, A' = Event that the pradeesh losses 1st round and B' = event that the priya losses 2nd ... =72/400+132/400 = 204/400 We have to find the %. Required % = (204/400)x100 = 51%.
Description : When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring ... spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring
Last Answer : (D) Square of wire diameter of each spring
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 : The spring index is the ratio of wire diameter to mean coil diameter. a) True b) False
Last Answer : a) True
Description : The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the (A) Ability to absorb shock (B) Capacity to store energy (C) Ratio of the wire & coil diameters (D) Load to produce unit deflection
Last Answer : Option D
Description : Heat cannot be created, nor destroyed, but it can be changed from one form to another. The energy in the universe remains constant. a. 1st Law of Energy Conservation b. 2nd Law of Energy Conservation c. 3rd Law of Energy Conservation d. None of the above
Last Answer : 1st Law of Energy Conservation
Description : Two similar coils of radius `R` are lying concentriclaly with their planes at right angels to each other. The currents flowing in them are `I` and `2I
Last Answer : Two similar coils of radius `R` are lying concentriclaly with their planes at right angels to each other. The currents ... /(2R)` D. `(mu_(0)i)/(R)`
Description : Two concentric coils each of radius equal to `2 pi cm` are placed at right angles to each other ` 3 ampere and 4 ampere` are the currents flowing in e
Last Answer : Two concentric coils each of radius equal to `2 pi cm` are placed at right angles to each other ` 3 ampere and 4 ... ` C. `7xx10^(-5)` D. `10^(-5)`