Q$7$ Runout in saind casting is coured by

$(4)$ foulty moulding flask

$($b$)$ Lower strength of the Solidified metal

c$)$ Poor casting cosign

$($d$)$ Higher Foraing tempature.

Q $(9-9$ The dimentions of a cylidrial side riber $($height $=$ didimeter$)$ for a $25cm15cm5cm$ steel casting cre to be determined. for share factor values $0\mathrm{.}6$ and ratio of the riser volume to cagting Volume of $0\mathrm{.}55,$ the diameter of the riser in $cm$ is

a$)15$

c$)10,95$

b$)6$

d$)88$

Q$-11$ Riser for Sondcasting can be designed using

a$)$ All of these

c$)$ Caine's method

b$)$ Noval Research labovatry methed

d$)$ Moduks method.

Q$-12$ The best shape for sprue in sundlaiting is

a$)$ either struight cylindrical or trapred

b$)$ Streight cytindrial

c$)$ Shape will not matter

d$)$ Tapered.

Q$-13$ Hardness is the Porerty of material due to which it

a$)$ con be rolled or hommered into thin sheets.

b$)$ will break with little fermonent distortion

c$)$ Can cut another metal

d$)$ can be drawn into wires.