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If you're talking about NDI or NDT, radiography is a much longer process (developing film etc.) and a more tedious task than UT. You have to operate in a dark room, set up the x-ray tubehead.. etc. Also, radiography has a lot more risks than UT.

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16y ago

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Why bridge rectifier is prefered more over centre tap rectifier?

A: the only reason that can be is you get twice the voltage minus a diode drop. That does not means twice the power but actually a little bit less/


What does it mean when a stick built house has a continuous foundation?

It means the house, esp. meaning the roof is not premanufactured (indicating it is "hand stacked" - a prefered more laborious process), and it's built on a slab foundation as apposed to a raised foundation.


Why is nand gate prefer over nor gate?

The nand gate is prefered over the nor gate because for a nand gate, all other states are true except the 1 1 state which is false while for a nor gate all other states are false except the 0 0 state which is true.


Why only low frequencies are used in hartley oscillators?

an Hartley oscillator uses a tapped inductor ( i.e an inductor with an additional connection at a suitable position in turns of the coil. ) with a specific tap ratio as per the circuit gain and design. For Low Frequency oscillators large inductances are required which have large number of coil turns. It is possible to get suitable ratios for such values hence this circuit is prefered.


Which valve is prefered to use for ammonia tanks a globe valve or a gate valve?

If the purpose of the valve is to modulate flow, a globe valve is preferable. If the valve is only on-off, a gate valve is preferable because of lower pressure drop when the valve is open. As wikipedia , A globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body. So i think it is a globe valve to use in steam pipeline.