Electromagnetic Field Theory - Practice Test

[#216] For a perfect matched load the value of standing wave ratio and reflection coefficient respectively are

(A) 1, 0

(B) 0, 0

(C) 0, 1

(D) ∞, 1

Correct Answer

(A) 1, 0

[#217] Laplace equation in cylindrical coordinates is given by:

(A) [{ abla ^2}V = frac{1}{ ho }frac{partial }{{partial ho }}left( {frac{{ ho partial V}}{{partial ho }}} ight) + frac{1}{{{ ho ^2}}}left( {frac{{{partial ^2}V}}{{partial {phi ^2}}}} ight) + frac{{{partial ^2}V}}{{partial {z^2}}} = 0]

(B) [{ abla ^2}V = frac{{{partial ^2}V}}{{partial {x^2}}} + frac{{{partial ^2}V}}{{partial {y^2}}} + frac{{{partial ^2}V}}{{partial {z^2}}}]

(C) [{ abla ^2}V = - frac{ ho }{varepsilon }]

(D) [{ abla ^2}V = frac{1}{r}frac{partial }{{partial r}}left( {frac{{{r^2}partial V}}{{partial r}}} ight) + frac{1}{{{r^2}sin heta }}frac{partial }{{partial heta }}left( {sin heta frac{{partial V}}{{partial heta }}} ight) + frac{1}{{{r^2}{{sin }^2} heta }}frac{{{partial ^2}V}}{{partial {phi ^2}}} = 0]

Correct Answer

(A) [{ abla ^2}V = frac{1}{ ho }frac{partial }{{partial ho }}left( {frac{{ ho partial V}}{{partial ho }}} ight) + frac{1}{{{ ho ^2}}}left( {frac{{{partial ^2}V}}{{partial {phi ^2}}}} ight) + frac{{{partial ^2}V}}{{partial {z^2}}} = 0]

[#218] A measure of the mismatch between the maximum and minimum voltage and current variation along the transmission line is called SWR, i.e. standing wave ratio. SWR indicates how much power is delivered to the load, and how much is lost in the line. When SWR is 1, the percent reflected power is zero. When SWR is 1.5, the percent reflected power will be

(A) 4

(B) 8

(C) 25

(D) 40

Correct Answer

(A) 4

[#219] The electric field of an electromagnetic wave at a point in free space is in the positive Y direction and the magnetic field is in the negative X direction. The direction of power flow will be in the

(A) +X direction

(B) +Y direction

(C) +Z direction

(D) -Z direction

Correct Answer

(C) +Z direction

[#220] The flux and potential functions due to a line charge and due to two concentric circular conductors are of the following form:

(A) Concentric circular equipotential lines and straight radial flux lines

(B) Concentric circular flux lines and straight equipotential lines

(C) Equipotential due to line charge are concentric cylinders and equipotential due to two conductors are straight lines

(D) Equipoential due to line charge are straight flat surfaces and those due to two conductors are concentric cylinders

Correct Answer

(A) Concentric circular equipotential lines and straight radial flux lines

Electromagnetic Field Theory - Study Mode

[#216] For a perfect matched load the value of standing wave ratio and reflection coefficient respectively are

Correct Answer

[#217] Laplace equation in cylindrical coordinates is given by:

Correct Answer

Correct Answer

[#219] The electric field of an electromagnetic wave at a point in free space is in the positive Y direction and the magnetic field is in the negative X direction. The direction of power flow will be in the

Correct Answer

[#220] The flux and potential functions due to a line charge and due to two concentric circular conductors are of the following form:

Correct Answer