Q1.Two infinitely long wires carrying current are as shown in the figure below. One wire is in the y - z plane and parallel to the y axis. The other wire is in the x - y plane and parallel to the x - axis. Which components of the resultingmagnetic field are non-zero at the origin ?
Answer : Option DExplaination / Solution:
Due to 1 A current wire in x - y plane, magnetic field be at origin will be in x direction. Due to 1 A current wire in y - z plane, magnetic field be at origin will be in z direction. Thus x and z component is non-zero at origin.
Q2.A fully charged mobile phone with a 12 V battery is good for a 10 minute talktime. Assume that, during the talk-time the battery delivers a constant current of 2 A and its voltage drops linearly from 12 V to 10 V as shown in the figure. How much energy does the battery deliver during this talk-time?
Answer : Option CExplaination / Solution:
The energy delivered in 10 minutes is
Q3.If a vector field is related to another vector field through which of the following is true? (Note : C and SC refer to any closed contour and any surface whose boundary is C . )
Q7.A white noise process X(t) with two-sided power spectral density 1 X 10-10 W/HZ is input to a filter whose magnitude squared response is shown below.
Answer : Option CExplaination / Solution: No Explaination.
Q9.Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown ?
Answer : Option AExplaination / Solution:
Rectangular and cylindrical waveguide doesn’t support TEM modes and have cut off frequency. Coaxial cable support TEM wave and doesn’t have cut off frequency.