CIVENG 2B04 Final: 2B04 Lecture 8 - Ch.5 Reactor Theory Examples.pdf

A double-notched specimen with dimensions of h = 10cm, w = 3cm, and a thickness of t = 2mm is subjected to a load of P = 32kN. The material has a Young’s modulus of 180 GPa and Poisson’s ratio of v = 0.42

1. a) Determine the energy release rate for a crack length of a = 4mm

2. b) Does this satisfy the conditions for plane strain? Is the assumption of LEFM valid?

   [4 Marks]

3. c) Determine the minimum dimensions and crack length to satisfy the conditions of both plane

strain and LEFM.

5. We were crushed by the hammer of sunlight.

        This is an example of...                               Simile            /             Metaphor

What two things are being compare?

Q3.
1. State the 3 Major Types of signal distortions. And state the frequency domain conditions for
each.
2. State the time domain condition for distotionless transmission.
3. A transmitter send a signal x(t)=A sin(2πfot + ϴ).The channel is the distortion less.
Propagation delay is г to reach to the receiver. Sketch the transmit and receive signals.
Verify the condition for distotionless transmission.
4. A 3000 km repeater system consists of m identical fibber-optic cable sections with
Attenuation 0.5 dB/km and m identical amplifiers. Find the required number of sections
and the gain per amplifier so that Pout = Pin = 5 mW and the input power to each amplifier
is at least 67 pW.