D30 FACE THE CHALLENGE

What does the symbol "R" denote in engineering drawing?

• Radius
• Resistance
• Right angle
• Reference

Answer explanation

"R" stands for Radius, commonly used to specify the radius of arcs and circles in technical drawings.

Which projection method is commonly used in India for engineering drawings?

• Third angle
• First angle
• Isometric
• Axonometric

Answer explanation

First angle projection is the BIS standard and is followed throughout India.

What is the minimum width for a residential staircase tread?

• 150 mm
• 250 mm
• 300 mm
• 400 mm

Answer explanation

Standard tread width for comfort and safety in residences is at least 250 mm.

Which tool is used to draw smooth curves that are not circular?

• Protractor
• Set square
• French curve
• Divider

Answer explanation

French curves help draw complex, non-circular curves in engineering drawings.

What is the function of a title block in a drawing sheet?

• Decorative purpose
• For notes only
• To provide drawing and project information
• For dimensions

Answer explanation

The title block contains all relevant information about the drawing, such as title, date, scale, and author.

What is the standard thickness of a line representing hidden details in a drawing?

• Thick
• Thin
• Medium
• Dashed

Answer explanation

Hidden details are shown with thin dashed lines according to drawing conventions.

What does 'NTS' mean on a drawing?

• Not to scale
• New technical standard
• Nearest to size
• No technical symbol

Answer explanation

'NTS' stands for Not to Scale, indicating the drawing is not proportionally accurate.

Which of these is a pictorial projection?

• Plan
• Elevation
• Isometric
• Section

Answer explanation

Isometric projection visually represents three dimensions in a single view.

Which instrument is used for dividing a line into equal parts?

• Compass
• Divider
• Protractor
• Scale

Answer explanation

Dividers are used to transfer and divide distances accurately.

Which is NOT a basic requirement for good building stone?

• Hardness
• Durability
• Porosity
• Workability

Answer explanation

Porosity is undesirable as it leads to water absorption and decay.