Chapter 7, Problem 41QAP

Q1. Choose the correct answer 1. With fixed number of quantization levels in PCM, the quantization noise is (linearly proportional to signal amplitude, non-linearly proportional to signal amplitude, linearly proportional to signal frequency, non-linearly proportional to signal frequency). 2. A PCM encoder uses 130 quantization levels. Which of the following N bits is more economical to encode such signal? (N=6, N=7, N=9, N=10). 3. Frequency Shift Keying can be accomplished by _multiplying two On-Off Keying signals, combining two Frequency Shift Keying signals, adding two (adding two On-Off Keying signals, Frequency Shift Keying signals). 4. Which of the following statements is true with respect to PCM? (The parallel binary data is converted into serial before transmission, Analog data is transmitted directly, Analog signal is amplified before transmission, The analog signal is converted into parallel binary data before transmission). 5. A baseband speech signal of maximum frequency of…

30 mm D = 40 MPa -30 mm B C 80 MPa PROBLEM 2.69 A 30-mm square was scribed on the side of a large steel pressure vessel. After pressurization, the biaxial stress condition at the square is as shown. For E = 200 GPa and v=0.30, determine the change in length of (a) side AB, (b) side BC, (c) diagnonal AC.

Please solve in detail this problem  thank you

0,5 mm 450 mm 350 mm Bronze A = 1500 mm² E = 105 GPa प 21.6 × 10-PC Aluminum A = 1800 mm² £ = 73 GPa = a 23.2 × 10-PC PROBLEM 2.58 Knowing that a 0.5-mm gap exists when the temperature is 24°C, determine (a) the temperature at which the normal stress in the aluminum bar will be equal to -75 MPa, (b) the corresponding exact length of the aluminum bar.

0.5 mm 450 mm -350 mm Bronze Aluminum A 1500 mm² A 1800 mm² E 105 GPa E 73 GPa K = 21.6 X 10 G < = 23.2 × 10-G PROBLEM 2.59 Determine (a) the compressive force in the bars shown after a temperature rise of 82°C, (b) the corresponding change in length of the bronze bar.

Three speech signals are TDM multiplexed with a high-quality music signal. If each speech signal is sampled at 16 kHz and PCM quantized by 8 bits/sample, while the music signal is sampled at 64 kHz with the same PCM quantizer. 1. Draw the block diagram of this TDM. 2. Calculate the output bit rate of this TDM.

The truss shown below sits on a roller at A and a pin at E.  Determine the magnitudes of the forces in truss members GH, GB, BC and GC.  State whether they are in tension or compression or are zero force members.

2P -1.8 m- -1.8 m- -B Wo P -1.8 m- C

A weight (W) hangs from a pulley at B that is part of a support frame.  Calculate the maximum possible mass of the weight if the maximum permissible moment reaction at the fixed support is 100 Nm.  Note that a frictionless pin in a slot is located at C.