- What are radiation pyrometers? With neat sketch explain the working of Jens-type thermal radiation receiver - With a neat sketch explain the working of a lens type thermal radiation receiver - Emissivity correction for optical pyrometer is much less than for radiation pyrometer justify. - Describe any two methods of pressure measuring devices in corrosive fluids. - Compare different pressure gauges. - Explain McLeod pressure page briefly. - Explain with neat sketch principle construction and working of Bellows pressure element. - Discuss about Black body condition with suitable diagram - Explain with neat sketch, Len's type thermal radiation receiver. - Explain the term pressure and vacuum measurement. - Discuss liquid seal air pressure measurement with neat diagram. - Define absolute pressure; differential pressure and gage pressure. - Explain with diagram photoelectric pyrometers. - Explain with diagram, mirror type thermal radiation receiver. In what temperature range radiation pyrometers are used? - Write notes on steam gage siphon \& thermopile