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_________ vibrators consists of the Steel Tube which is inserted in fresh concrete.

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_________ vibrators consists of the Steel Tube which is inserted in fresh concrete.

(a) Surface vibrators

(b) Internal vibrators

(c) Vibrating table

(d) Shutter vibrators

I had been asked this question in a national level competition.

Asked question is from Curing of Concrete topic in portion Cement Concrete Construction of Construction & Building Materials

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Right choice is (b) Internal vibrators

To explain: The Internal vibrators or Immersion vibrators should be inserted and withdrawn slowly and they should be operated continuously while they are being withdrawn. In this, the Steel Tube is called poker and it is connected to an electric motor or a petrol engine through a flexible tube.

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