Q $-1)$ In a guting system, the ration $1$:$2$:$4$ represents

$($a$)$ Runner crea: Ingute area: Casting area

b$)$ Sprue base urea: ingate crrea: Casting area

$($c$)$ Pouring busin area: ingate area: Runner urea

$($d$)$ Sprue base area: rumner area: ingate area

Q$.2$ To reduce the mould errossion in a sandcasting.

$($a$)$ Runner is made trapezoidal

$($b$)$ Sprue base well is rovided

$($c$)$ Cylindrical sprue is used.

$($d$)$ Sirue is traefed.

Q$-3$ The hot trearing in a metal casting is due to

a$)$ Low coefficient of thermal expansion

b$)$ wide range of Solidification temprature

$(9)$ High melt temprature

$($d$)$ High fluidity

Q$-4$ Advantages of Providing a top gate in a sandcasting is

$($a$)$ None of these

$($b$)$ slow filling of the mould cavity

$($c$)$ favorable temprature gradient is achieved

$($d$)$ smooth flow of metal into the mould cavity.

Q$-5$ A choplet is osed in a sand mould to

$($a$)$ Bevent the formatian of cold shuts

D$)$ Support the core during the molten metal fouring

$(9)$ support the moluld from breaking

$($d$)$ support the mould from moving mould cualls.

Q$-6$ pouring time for a given casting is increased by$.$

$($a$)$ Using sprue buse cuell

$($b$)$ increased gection thickness of the casting

$($c$)$ Using green sand mould

$($d$)$ Using wide runners.