Questions in: Engineering

Right Answer:
43 and 53 refer to the grades of cement based on their compressive strength. Grade 43 cement has a minimum compressive strength of 43 MPa (megapascals) at 28 days, while Grade 53 cement has a minimum compressive strength of 53 MPa at the same age.

Right Answer:
The weight of concrete for 1 cubic meter (cum) is approximately 2,400 kilograms (or 2.4 metric tons).

Right Answer:
To calculate the quantities of sand and cement for a 1:5 ratio brick masonry, follow these steps:

1. Determine the total volume of the mortar needed (in cubic meters or cubic feet).
2. For a 1:5 mix, the total parts = 1 (cement) + 5 (sand) = 6 parts.
3. Calculate the volume of cement: (Total volume of mortar) × (1/6).
4. Calculate the volume of sand: (Total volume of mortar) × (5/6).

For example, if you need 1 cubic meter of mortar:
- Cement = 1/6 × 1 = 0.167 m³
- Sand = 5/6 × 1 = 0.833 m³

Convert these volumes to weight if needed (Cement: approx. 1440 kg/m³, Sand: approx. 1600 kg/m³).

Right Answer:
During my MBA, I worked on a project focused on optimizing energy consumption in commercial buildings. We analyzed energy usage patterns, identified inefficiencies, and proposed solutions that included implementing smart technologies and improving operational practices. This project helped me understand the intersection of business management and electrical engineering principles.

Right Answer:
An ideal team worker is someone who communicates effectively, collaborates well with others, is reliable, shows respect for diverse opinions, and contributes positively to the team's goals.

Right Answer:
To calculate the water-cement ratio, divide the weight of water (in kg) by the weight of cement (in kg). The formula is:

Water-Cement Ratio = Weight of Water / Weight of Cement.

Right Answer:
The maximum allowable silt content in river sand is typically 5%.

Right Answer:
To calculate the quantity of an RCC column, use the formula:

Quantity = Length × Width × Depth × Density

1. Measure the dimensions of the column (Length, Width, Depth) in meters.
2. Calculate the volume in cubic meters (m³).
3. Multiply the volume by the density of concrete (approximately 2400 kg/m³) to get the weight in kilograms.

For example, if the column dimensions are 0.3m x 0.3m x 3m:

Volume = 0.3 × 0.3 × 3 = 0.27 m³
Weight = 0.27 m³ × 2400 kg/m³ = 648 kg

Right Answer:
To calculate the quantity of sand required for 15 mm plaster for 100 sqm, you need to consider the volume of plaster.

1. Thickness of plaster = 15 mm = 0.015 m
2. Area = 100 sqm

Volume of plaster = Area × Thickness = 100 sqm × 0.015 m = 1.5 cubic meters.

Assuming the mix ratio for plaster is 1:4 (cement:sand), the total parts = 1 + 4 = 5.

Quantity of sand = (4/5) × Volume of plaster = (4/5) × 1.5 m³ = 1.2 m³.

So, the quantity of sand required is **1.2 cubic meters**.

Right Answer:
The neck ring in a centrifugal pump helps to minimize the recirculation of fluid within the pump casing, improving efficiency and maintaining a stable flow by directing the fluid towards the impeller.

Right Answer:
To calculate the number of earthing pits, consider the following:

1. **Earthing Pit Calculation**: Generally, one earthing pit is required for every 1000 m² of building area. The dimensions of each pit should be around 1 m x 1 m x 2.5 m deep.

2. **Lightning Arrester Rod Calculation**: For a building of 35 m height, typically one lightning rod is needed for every 20 m of height. Therefore, you would need at least 2 lightning rods for a 35 m building.

Ensure to consult local codes and standards for specific requirements.

Right Answer:
To calibrate a capillary type level transmitter (LT), follow these steps:

1. **Prepare the Calibration Setup**: Ensure you have a reference level gauge or a calibrated liquid level source.

2. **Zero Calibration**: Fill the tank or calibration vessel to the zero level. Adjust the transmitter output to match the zero reference point.

3. **Span Calibration**: Fill the tank to the known span level (maximum level). Adjust the transmitter output to match the span reference point.

4. **Verify Linearity**: Check the output at several intermediate levels to ensure linearity. Adjust if necessary.

5. **Document Calibration**: Record all readings and adjustments made during the calibration process for quality assurance.

6. **Final Check**: After calibration, perform a final check by comparing the transmitter readings with the reference gauge at various levels to confirm accuracy.

Ensure to follow manufacturer guidelines and safety protocols throughout the process.