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ESE EE : Electromagnetic fields National Champion Test
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Question 1
A phasor
1) May be a scalar or a vector
2) Is a time-dependent quantity
3) Is a complex quantity
Which of the above statements are correct?
1) May be a scalar or a vector
2) Is a time-dependent quantity
3) Is a complex quantity
Which of the above statements are correct?
Question 2
The maximum space rate of change of the function which is in increasing direction of the function is known as
Question 3
Consider the following statements in connection with electromagnetic wsves :
1) Conducting medium behaves like an open circuit to the electromagnetic field.
2) At radio and microwave frequencies the relaxation time is much less then the period
3) in loss-less dielectric the relaxation time is infinite.
4) Intrinsic impedance of a perfect dielectric medium is a pure resistance.
Which of these statements is/are correct ?
1) Conducting medium behaves like an open circuit to the electromagnetic field.
2) At radio and microwave frequencies the relaxation time is much less then the period
3) in loss-less dielectric the relaxation time is infinite.
4) Intrinsic impedance of a perfect dielectric medium is a pure resistance.
Which of these statements is/are correct ?
Question 4
A transmission line section shows an input impedance of 36 
and 64 
when short circuited and open circuited respectively. What is the characteristic impedance of the transmission line?
and 64 when short circuited and open circuited respectively. What is the characteristic impedance of the transmission line?Question 5
Consider the following statements :
1) In conducting medium the field attenuates exponentially with increasing depth.
2) Conducting medium behaves like an open circuit to the electromagnetic field.
3) In lossless dielectric relaxation time is infinite.
4) In chare-free region, the Poisson’s equation becomes Laplace’s equation.
Which of the above statements are correct?
1) In conducting medium the field attenuates exponentially with increasing depth.
2) Conducting medium behaves like an open circuit to the electromagnetic field.
3) In lossless dielectric relaxation time is infinite.
4) In chare-free region, the Poisson’s equation becomes Laplace’s equation.
Which of the above statements are correct?
Question 6
A 50 
distortionless transmission line has a
capacitance of 10-10 F/m. What is the charac-teristic impendance of the line ?
distortionless transmission line has a capacitance of 10-10 F/m. What is the charac-teristic impendance of the line ?
Question 7
What is the attenuation constant 
for distortionless transmission line ?
for distortionless transmission line ? Question 8
When a losses transimission line is terminated by a resistance equal to surge impedance , then what is the value of the reflection coefficient ?
Question 9
Which one of the following is the Poisson's equation for a linear and isotropic but inhomogeneous medium?
Question 10
If the electric field established by three point charges Q, 2Q and 3Q exerts a force 
on 3Q and 
on 2Q, then what is the force exerted on the point charge Q?
on 3Q and on 2Q, then what is the force exerted on the point charge Q? Question 11
Six capacitors of different cfapacitances C1, C2, C3, C4, C5 and C6 are connected in series C1 > C2 > C3 > C4 > C5 > C6. What is the total capacitance almost equal to?
Question 12
Image theory is applicable to problems involving
Question 13
Where is the Laplace's equation valid?
Question 14
If the electric field established by three point charges Q, 2Q and 3Q exerts a force 
on 3Q and 
on 2Q, then what is the force exerted on the point charge Q?
on 3Q and on 2Q, then what is the force exerted on the point charge Q? Question 15
Equipotential surface about a pair of equal and opposite linear charges exist in what form?
Question 16
Which one of the following is not the valid expression for magnetostatic field vector 
?
?Question 17
Equation 
is based on
is based on Question 18
A circular loop placed perpendicular to a uniform sinusoidal magnetic field of frequency ω1 is revolved about an axis through its diameter at an angular velocity ω2 rad/sec (ω2 < ω1) as shown in the figure below. What are the frequencies for the e.m.f. induced in the loop?
Question 19
How much current must flow in a loop radius 1 m to produce a magnetic field 1 mAm–1?
Question 20
The magnetic flux density created by an infinitely long conductor carrying a current I at a radial distance R is
Question 21
A magnetic ring has a mean circumference of 20 cm and a cross-section of 20 cm2 and has 800 numbers of turns of wire. When the exciting current is 5 A, the flux is 2 mWh. The relative permeability of iron is nearly
Question 22
A conductor of length 100 cm moves at right angle to a uniform field flux density of 1.5 Wb/m with a velocity of 50 m/s. The e.m.f. induced in the conductor will be
Question 23
The following equation is not valid for magnetostatic field in homogenous magnetic materials:
Question 24
Which of the following is not a Maxwell's Equations?
Question 25
Maxwell equations
1) are extension of the works of Gauss, Faraday and Ampere
2) Help studying the application of electrostatic fields only
3) can be written in integral form and point form
4) need not be modified depending upon the media involved in the problem
Which of the above statements are correct?
1) are extension of the works of Gauss, Faraday and Ampere
2) Help studying the application of electrostatic fields only
3) can be written in integral form and point form
4) need not be modified depending upon the media involved in the problem
Which of the above statements are correct?
Question 26
is different form of Question 27
In free space, if 
, the poisson’s equation becomes
, the poisson’s equation becomes Question 28
Which of the following is a vector quantity?
Question 29
Assertion (A) : A thin sheet of conducting material can act as a low – pass filter for electromagnetic waves
Reason (R): The depth of penetration is inversely proportional to the square root of the frequency
Reason (R): The depth of penetration is inversely proportional to the square root of the frequency
Question 30
When a plane wave propagates in a dielectric medium ?
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Apr 26ESE & GATE EE
