Define a wood primer and its purpose
What will be an ideal response?
A wood primer is a special paint used to seal bare wood. The purpose of primer is to penetrate the
wood as it is applied, sealing any pores and preparing the old wood to receive new paint.
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Describe precast concrete columns and their formation with regard to precast concrete construction.
What will be an ideal response?
If all of the shielding gas is blown away from the molten weld pool, ____.
A. the weld will have burn-through B. excessive spattering can result C. excessive slag will result D. oxides can cause porosity
An SCR has a circuit fusing (I2t) rating of 100 A2s. If the device is subjected to a 60 A current surge that lasts for 12 ms, the I2t value is
A) 60 A2s B) 3600 A2s C) 43.2 A2s D) 12 A2s
________ use DC voltage to attract dust and contaminants to an electrically charged media or plate
A) Electronic air cleaners B) Ultraviolet lights C) Pleated filters D) HEPA filters