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a. Given a circular aperture transmit antenna with efficiency of 0.7 operating at 10 GHz and having a diameter of 1.5 m. Find its maximum gain.
b. Find its 3-dB beam width.
c. Plot its antenna gain pattern in decibels versus angle off boresight in degrees.
Two short antennas each of length 10cm at the origin carry identical currents of I = 5 Sin (wt). One is in the az direction and the other one is in the ay direction. If the frequency of the antenna is 60 MHz then calculate
Using circuit diagrams showing current directions in each mode of operation, describe how a dual converter is operated in the motoring and generating modes.
The O.C and S.C test data are given below for a single phase, 5 kVA, 200V/400V, 50Hz transformer. O.C test from LV side:200V 1.25A 150WS.C test from HV side:20VV 12.5A 175W
suppose a fair coin is tossed n times. each coin toss costs d dollars and the reward in obtaining x heads is ax2 bx.
A 1200-kg car moving at 20 km/h is accelerated at a constant rate of 4 m/s2 up to a speed of 75 km/h. What are the force and total time required?
Assuming that directions of arrival are uniformly distributed at the mobile, how large is the correlation coefficient for a GSM 900 system between the channel in the middle and the end of the burst when the mobile station moves at 200 km/h
Consider a PCM-TDM system in which 24 signals are to be processed. Each signal has a baseband bandwidth of 3 KHz. The sampling rate has to be 33.3% higher than the theoretical minimum, and 8 bits are to be used.
Assume the equipment draws a current of 15A; compute the voltage on the chassis.
What is the time constant of the circuit with S1 closed and what is the eventual steady-state current with S1 closed - what is the value of the circuit current at the first instant S1 is closed?
In the truth table, use the don't care term to represent 1bit (or 2 bits) of the entries whose outputs are the same for thebit(s) is both 0 and 1. For example, for the F=11, X= 1110 andX=1111. Then X can be written as X=111×.
Obtain the (optimal) Boolean expression for each output (Karnaugh maps can be helpful).
Find a table listing the critical temperatures for a variety of materials. - List at least five materials with the critical temperatures that are not mentioned in this text.
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