Question:
In metal casting, which sprue:runner:gate \emph{area ratio represents a non-pressurized gating system?}
In metal casting, which sprue:runner:gate \emph{area ratio represents a non-pressurized gating system?}
Show Hint
Remember: non-pressurized \(\Rightarrow\) area increases downstream (sprue→runner→gates); pressurized \(\Rightarrow\) gate area is the smallest to create back-pressure.
Updated On: Aug 23, 2025
- \(1:2:3\)
- \(3:2:1\)
- \(4:3:1\)
- \(5:4:1\)
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Definition.
A \emph{non-pressurized} (unpressurized) gating system has total gate area > runner area > sprue area. This keeps metal velocity low and minimizes turbulence; the flow is controlled by the sprue choke. Step 2: Check ratios.
We need an increasing sequence from sprue to gates. - (A) \(1:2:3\) \(\Rightarrow\) gates largest \(\Rightarrow\) non-pressurized.
- (B) \(3:2:1\), (C) \(4:3:1\), (D) \(5:4:1\) \(\Rightarrow\) decreasing to gates \(\Rightarrow\) \emph{pressurized} (gate choke). Step 3: Conclude.
\[ \boxed{1:2:3 \text{ is non-pressurized}} \]
A \emph{non-pressurized} (unpressurized) gating system has total gate area > runner area > sprue area. This keeps metal velocity low and minimizes turbulence; the flow is controlled by the sprue choke. Step 2: Check ratios.
We need an increasing sequence from sprue to gates. - (A) \(1:2:3\) \(\Rightarrow\) gates largest \(\Rightarrow\) non-pressurized.
- (B) \(3:2:1\), (C) \(4:3:1\), (D) \(5:4:1\) \(\Rightarrow\) decreasing to gates \(\Rightarrow\) \emph{pressurized} (gate choke). Step 3: Conclude.
\[ \boxed{1:2:3 \text{ is non-pressurized}} \]
Was this answer helpful?
0
0
Top Questions on Metallurgical
- A cylindrical Al alloy billet of 300 mm diameter is hot extruded to produce a cylindrical rod of 75 mm diameter at a constant true strain rate of 10 s$^{-1$. The flow stress of the alloy at the extrusion temperature is given by $\sigma = 10 \, (\dot{\epsilon})^{0.3}$ MPa. Assume the alloy is perfectly plastic and there is no temperature rise during the extrusion process. The ideal plastic work of deformation per unit volume is ............ × 10$^6$ J m$^{-3}$ (rounded off to one decimal place).}
- GATE MT - 2025
- Metallurgical Engineering
- Metallurgical
- Front tension is applied during cold rolling of a thin metal sheet. Which of the following statements is/are TRUE?
- GATE MT - 2025
- Metallurgical Engineering
- Metallurgical
- Match the casting defects in Column I with the characteristic features in Column II. Column I:
P. Misrun
Q. Expansion scab
R. Pin holes
S. Hot tearing
Column II:
1. Penetration of liquid metal behind surface layer of sand moulds
2. Metal solidifies prematurely in the mould and some sections of the casting are not filled
3. Cracking because of restraint to contraction in certain areas during solidification and cooling
4. Evolution of gases during solidification resulting in porosity
- GATE MT - 2025
- Metallurgical Engineering
- Metallurgical
- Which of the following techniques can be used to detect an internal defect in a metal casting?
- GATE MT - 2025
- Metallurgical Engineering
- Metallurgical
Radiative heat flux \( \dot{q} \) at a hot surface at a temperature \( T_s \) can be expressed as \[ \dot{q} = A f(T_s, T_\infty) (T_s - T_\infty) \] where \( A \) is a constant and \( T_\infty \) is the temperature of the surroundings (temperatures are expressed in K). The function \( f(T_s, T_\infty) \) is given by ______.
- GATE MT - 2025
- Metallurgical Engineering
- Metallurgical
View More Questions
Questions Asked in GATE MT exam
- Two consecutive estimates of the root of a function $f(x)$ obtained using the Newton-Raphson method are $x_i = 8.5$ and $x_{i+1 = 13.5$, and the value of the function at $x_i$ is 15. The numerical value of the first derivative of the function evaluated at $x_i$ is ............ (in integer).}
- GATE MT - 2025
- Calculus
- Temperatures at two sides of a 0.4 m thick copper plate are 1000 and 500 °C. Assuming steady state, one-dimensional conductive heat transfer through the wall and ignoring end-effects, the magnitude of the heat flux through the wall is ............... × 10$^5$ W m$^{-2$ (in integer).} Given: Thermal conductivity of copper = 400 W m$^{-1}$ K$^{-1}$
- GATE MT - 2025
- Thermodynamics
- The reaction represented by A → B follows first order kinetics. At a given temperature, 20\% of the reaction is completed in 223 s. The time taken to complete 50\% of the reaction at the same temperature is ............ s (rounded off to the nearest integer).
- GATE MT - 2025
- Reaction Mechanisms & Synthesis
- A cylindrical specimen is subjected to plastic deformation in tension up to a uniform elongation of 10\%. The final cross-sectional area of the gage section is found to be 20 mm$^2$. The initial cross-sectional area of the gage section is ............ mm$^2$ (rounded off to an integer).
- GATE MT - 2025
- Material Science
- A single crystal BCC metal with a lattice parameter $a = 0.4$ nm is subjected to deformation at a shear strain rate of 0.001 s$^{-1$. If the average mobile dislocation density in the single crystal is $10^{10}$ m$^{-2}$, the average dislocation velocity is ............. × 10$^{-3}$ m s$^{-1}$ (rounded off to two decimal places). Given: Burgers vector $b = \dfrac{a}{2}\langle 111 \rangle$.}
- GATE MT - 2025
- Material Science
View More Questions