Bissoy.com
Doctors Medicines MCQs Q&A

In sand moulding, the thickness of sand mould and bond strength should be high as much as possible to avoid sand inclusion in machine parts.

In sand moulding, the thickness of sand mould and bond strength should be high as much as possible to avoid sand inclusion in machine parts. Correct Answer False

High bonding strength of sand in mould mixture and its thickness does not avoid the problem of sand inclusion in machine parts greatly, and even this reduces permeability of moulding mixture in a great amount which results into the formation of castings with defects like blow holes.

Related Questions

Which one of the following is not correct about English bond? a) Bricks in one layer are laid on header bond and courses above and below are stretcher bond b) Bricks in one layer are laid on stretcher bond and courses above and below are header bond c) Every layer of bricks is laid on header and stretcher bond d) Bricks layer aligned such that vertical joint is continuous
The influence of shape of aggregate in strength and workability of concrete are given below in statements S1, S2, S3 and S4. Which of the statements are correct? S1: Rounded aggregate produces concrete with high workability and low strength. S2: Angular aggregate produces concrete with high workability and low strength. S3: Rounded aggregate produces concrete with low workability and high strength. S4: Angular aggregate produces concrete with low workability and high strength.
Co2 moulding is a kind of sand moulding, but it is not economical than the green sand moulding.
In a motor of 120 machine parts, 5% parts were defective. In another motorof 80 machine parts, 10% parts were defective. For the two motors considered together,the percentage of defective machine parts were
At the mould exit of a continuous caster, the metal consisting of a solidified shell with a liquid metal core exits at the rate of 35 kg S-1. Given that the latent heat of fusion is 3 × 105 J kg-1 and the total rate of heat removal by the mould is 4.2 × 106 W, the mass fraction of solid at the mould exit is . . . . . . . .
Assume that both while solid and liquid remain at the melting point, they are in the mould.
Thickness of 8 tyres L, M, N, O, P, Q, R and S is compared. Thickness of no two tyres is same. Thickness of N is more than L but less than 6 tyres. Thickness of O is more than M but less than Q. Thickness of P is less than only two tyres. Thickness of Q is not more than P. Which of the following statement is not correct?
Consider the following statements regarding milling machine: 1. In the vertical milling machine, it Is possible to machine dovetail recesses. 2. In universal milling machine, the worktable can be swivelled. 3. In rotary milling machine, motion imparted to work is rotary. 4. Planer milling machine is provided with several horizontal and vertical heads. Which of the above statements are correct?
Which of the following statements regarding an atom are correct? 1) If two atoms with similar ionization potential form a bond, then this bond will most probably be either covalent or metallic. 2) When atoms with different ionization potentials form a bond, the bond will be mainly ionic. 3) If the atom or molecule already has its outer shells completely full, then the bonding between the atoms or molecules will be a secondary bond when it solidifies.
Consider the following statements.  I. Pi-Bond is stronger than the Sigma Bond.  II. Sigma Bond is formed by linear overlapping of atomic orbitals.  III. In the case of Pi-Bond, the extent of overlapping of atomic orbitals is more as compared to the Sigma Bond.  Which among the above is/are NOT correct?
Given below is a sentence which has been divided into four parts. The first part, which has been marked bold, is fixed in the sequence. The other three parts have been rearranged in the sequence and the four options give possible sequences of the three parts. Choose the option which gives the correct sequence of the rearranged parts. As much as I sympathize with you/ I can do much to help you because (A) / I'm afraid there's not much (B) / I'm in severe need of help myself. (C)