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Which of the following statements is not true about the linear polarization technique? a) Measurements begin at-20 mV from OCP and end around +100 mV from OCP b) The slope of the plot is AE/AC is given in volts/amperes or mV/mA c) This technique can be used to determine very low rate of corrosion d) It can be used to monitor corrosion rate in process plant

7. Pyrheliometer is used to measure direct beam radiation and can be used to measure diffuse radiation by using the shading ring True False

2. In thermal radiation, when temperature (T) increases, which of following relationship is correct? A. Light intensity (total radiation) increases as I x T. B. Light intensity (total radiation) increases as I x T4. C. The maximum emission wavelength increases as Amax x T. D. The maximum emission wavelength increases as Amax x T4.

An active dipole in open circuit has a voltage of 120v and in short circuit it has a current of 25A. Under what current does a 750W load absorb and under what condition does it present maximum efficiency.

A flat luminaire with dimensions 1.2 x 0.2m is mounted in a ceiling. The fixture has an opal plastic plate at the bottom, and can be considered ideal diffused. On a wall in the room there is a picture with dimensions 0.4m x 0.4m, as shown in the figure. The measurements apply from the midpoint of fixture and picture. The luminous flux of the light source is 6200 lm. The luminous intensity normally from the bottom of the luminaire is 1400 cd. a) Determine the luminous flux going out of the luminaire. What is the luminaire's efficiency?

The answer according to the book is 5.57 MW

Listen What are the dependable factors in the differentiation between specular and diffuse light reflection? N

How did you calculate the angles of IL,Ic,Ir & It?

A grating has 1000 lines/mm of width. How wide must the grating be in order to resolve the mode structure of a HeNe laser beam of wavelength 633 nm? The frequency difference between the modes is 450 MHz.