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Low Pressure Gas Hazards : Safety screens and wire-mesh guards should be placed round evacuated glassware and safety goggles or a face shield must be worn against the possibility of implosion. This particularly applies when large desiccators or Buchner funnels are being evacuated. 'Take care when connecting thin walled glassware to a vacuum line or filter pump. The rule is, don't do so ' unless it is designed to withstand low pressures. Glassware should be examined for flaws before it is evacuated. If a crack occurred in a vessel which was partially evacuated, the effect of this enormous force compressing the weakened flask would cause it to implode (i.e. to explode inwards) propelling , fragments of broken glass in all directions.
Figure: (a) Buchner funnel (b) Vacuum desiccator (c) 'Protective wire-mesh guard
Data Communication 1. Write short notes on: a. Sky wave propagation b. Line of sight propagation 2. List and describe the different types of errors that occur during dat
Usage of transistor: The bipolar junction transistor that is abbreviated as BJT was the most generally used transistor in the 1960s and 70s. Even later than MOSFETs became ext
MATLAB
Q. A magnetic circuit is found to have an ac hysteresis loss of 10 W when the peak current is Im = 2 A. Assuming the exponent of Bm to be 1.5, estimate Ph for Im = 0.5A and 8A.
Q. A 75-kVA transformer has an iron loss of 1 kW and a full-load copper loss of 1 kW. If the transformer operates on the following load cycle, determine the all-day efficiency:
What is the position of the Stack Pointer after the POP instruction? Ans) The address line is 02 greater than the previous value.
what is the time of short circuit ?
Damage of revolving metallic disc due to tampering
ELECTRICAL STARTER MOTOR This usually consists of a heavy duty, compound wound, DC motor, which draws its electrical supply from an external source. The motor works in conjunc
Q. Explain Telephone hand set and it’s working ? A standard telephone set is comprised of a transmitter, a receiver and electrical network for equalization, associated circ
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