On the planet Mars, the power per unit area in sunlight is F = 590Wm^-2 . Mars’s emissivity for infrared radiation is = 0.93. If the surface temperature on Mars is -60 C, what fraction (to within a few percent) of the sunlight shining on Mars gets absorbed? (a) less than 1% (b) 75% (c) 20% (d) 30%

Radiation resistance of a small dipole current element of length l at a frequency of 6 GHz is 9 ohms. If the length is changed by 5%, then the percentage change in the radiation resistance?

Wireless technology is rapidly evolving, and is playing an increasing role in
the lives of people throughout the world. Analyze the potential issues and
problems associate with wireless technology.

plz answer me quickly.

SUBJECT : TELECOMMUNICATION SWITCHING AND NETWORK.

(microwave) how do "waveguide/coaxial cable Adaptors"  work?

why is the N region of a PNP transistor smaller than the P region? why wouldn't it work if the N region were bigger?

Exercises

1. A 25 kVA single-phase transformer has the primary and secondary number of turns of 200 and 400, respectively. The transformer is connected to a 220 V, 50 Hz source. Calculate the (i) turns ratio, and (ii) mutual flux in the core.

2. A 25 kVA, 2200/220 V, 50 Hz single-phase transformer’s low voltage side is short-circuited and the test data recorded from the high voltage side are P=150 W, I1 = 5A and V1 = 40 V. Determine the (i) equivalent resistance, reactance and impedance referred to primary, (ii) equivalent resistance, reactance and impedance referred to secondary.

3. A 30 kVA transformer has the iron loss and full load copper loss of 350 and 650 W, respectively. Determine the (i) full load efficiency, (ii) output kVA corresponding to maximum efficiency, and (iii) maximum efficiency. Consider that the power factor of the load is 0.6 lagging. (97.74%, 13.2 kW, 94.96%).

4. A 2.5 kVA, 200 V/40 V single-phase transformer has the primary resistance and reactance of 3 and 12 Ω, respectively. On the secondary side, these values are 0.3 and 0.1 Ω, respectively. Find the equivalent impedance referred to the primary and the secondary. (17.9ohms, 0.72ohms).

Design a system to measure bending strain using a full-bridge wheatstone bridge configuration.

The heart of a computer system is an ARITHMETIC AND LOGIC UNIT (ALU) which is responsible for executing arithmetic (e.g., addition, subtraction, etc.) and logic (e.g., AND, OR, etc.) operations. In this project, you will design, simulate, and implement a simple 1-bit ALU.

The truth table for ALU is given below:

Operation Selection Inputs Operation Output(s)
S0 S1 A B
0 0 A AND B AB
0 1 A NOR B (A+B)’
1 0 A XNOR B (A⊕B)’
1 1 A SUB B Borrow, Difference

Consider the following sequential 8bit ADC with VREF=10V

a) Draw the corresponding operating plot when it has an input voltage of 7.3865V

b) for each of the conversion steps compute the percentage of error.

The system function H5(s) represents a 1 rad/sec fifth-order normalized Butterworth filter.

a) Give H5(s) in both the polynomial and quadrature factored forms

b) Repeat (a) for Chebyshev type I filter with ϵ =0.7647831.

create a process flow diagram for the manufacturing of cell phones

Q01
h layers 2 and 3 of X.25. Are both necessary, or is this control mechanisms are used at bot-Flow .sredundant? Explain the problems which can be avoided for having flow control at both layer .

Question 1:

What is the main use of stepper motors?

What are the similarities and differences between a reluctance, a permanent magnet and hybrid stepper motors? Describe the construction of a hybrid stepper motor.

A signal with a maximum frequency of 3 kHz is sampled at 50 kHz. What would the required transition width be in Hertz to...
(a) decimate the signal by a factor of 8? (b) decimate the signal by a factor of 5? (c) interpolate the signal by a factor of 4?