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Magnetic circuit and electromagnetism
| 1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
| 2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
| Q1 ⇒ The surface integral of the electrical field intensity is the net flux emanating from the surface. [other wrong options] [Discuss in forum] |
| Q2 ⇒ Soft magnetic materials have high permeability and low coercive force. [other wrong options] [Discuss in forum] |
| Q3 ⇒ ∇B is based on Gauss's law. [other wrong options] [Discuss in forum] |
| Q4 ⇒ The magnetic field intensity (in A/m) at the centre of a circular coil
of diameter 1 m and carrying a current of 2 A is 2 [other wrong options] [Discuss in forum] |
| Q5 ⇒ A magnetic circuit requires 800 AT to produce a certain quantity
of flux in magnetic circuit. If its excitation coil has 100 turns and
5 ω resistance, the voltage tobe applied in exciting coil is 40 V [other wrong options] [Discuss in forum] |
| Q6 ⇒ The emf induced in a coil due to relative motion of a magnet is
independent of coil resistance. [other wrong options] [Discuss in forum] |
| Q7 ⇒ The inductance of a long solenoid of length 1,000 mm wound
uniformly with 3000 turns on a cylindrical paper tube of 60 mm
diameter is 32 mH [other wrong options] [Discuss in forum] |
| Q8 ⇒ Two coils are coupled in such a way that the mutual inductance
between them is 16 mH. if the inductances of the coils are 20 mH
and 80 mH respectively, the coefficient of coupling is 0.4 [other wrong options] [Discuss in forum] |
| Q9 ⇒ Which of the following inductors will have the least eddy current
losses? air-cored. [other wrong options] [Discuss in forum] |
| Q10 ⇒ Core of an electromagnet should have both (a) and (b). [other wrong options] [Discuss in forum] |
| Q11 ⇒ What is the value of total electric flux coming out of a closed
surface? Equal to the total charge enclosed by the surface. [other wrong options] [Discuss in forum] |
| Q12 ⇒ Soft magnetic material is iron. [other wrong options] [Discuss in forum] |
| Q13 ⇒ Image theory is applicable to problems involving electrostatic field only. [other wrong options] [Discuss in forum] |
| Q14 ⇒ The field at any point on the axis ofa current carrying coil will be parallel to the axis. [other wrong options] [Discuss in forum] |
| Q15 ⇒ Δ x E = dB/dt is derived from Faraday's law. [other wrong options] [Discuss in forum] |
| Q16 ⇒ If a copper conductor is moved across a magnetic field a voltage will be induced in the wire. [other wrong options] [Discuss in forum] |
| Q17 ⇒ The inductance of a single layer solenoid of 10 turns is 5 µH.
Which one cf the following is the correct value of inductance
when the number of turns is 20 and the length is doubled? 10 µH [other wrong options] [Discuss in forum] |
| Q18 ⇒ Two identical coils of negligible resistance, when connected in
series across a 50Hz fixed voltage source, draw a current of 10 A.
When the terminals of one of the coils are reversed, the cun'ent
drawn is 8 A. The coefficient of coupling between the two coils is 1/9 [other wrong options] [Discuss in forum] |
| Q19 ⇒ Magnetostriction is a phenomenon whereby the magnetisation of
a ferromagnetic material leads to a change in physical dimensions [other wrong options] [Discuss in forum] |
| Q20 ⇒ When a battery of E volts is suddenly applied across an ideal
inductance of L henry, the current through inductance will be increasing linearly at the rate of E/L ampere/s. [other wrong options] [Discuss in forum] |
| Or |