D65 CHECK YOUR LEVEL

In AutoCAD, which plotting option plots everything currently visible in the drawing area?

• Layout
• Extents
• Display
• Window

Answer explanation

Display plots all objects currently visible in the drawing window.

Which AutoCAD command restores the most recently erased objects?

• REDO
• REINSERT
• OOPS
• COPY

Answer explanation

OOPS brings back the last erased selection, unlike UNDO/REDO.

AutoCAD begins measuring polar angles from which direction?

• 12 o'clock
• 9 o'clock
• 6 o'clock
• 3 o'clock

Answer explanation

Default zero angle is along the positive X-axis, i.e., 3 o’clock.

Which option best explains the difference between PURGE and OVERKILL in AutoCAD?

• PURGE removes unused items; OVERKILL removes duplicate/overlapping objects
• PURGE deletes layers; OVERKILL deletes blocks
• PURGE explodes blocks; OVERKILL cleans 3D objects
• PURGE only works in 3D; OVERKILL only in 2D

Answer explanation

PURGE cleans unused layers/linetypes/blocks; OVERKILL cleans duplicates/overlaps.

Which keyboard toggle enables numeric keypad input for digits 0–9?

• Caps Lock
• Num Lock
• Shift
• Enter

Answer explanation

Num Lock turns on numeric keypad entry.

The centroid of a rectangle (b×d) from its base measured vertically is located at:

• d/2
• b/2
• d/3
• 2d/3

Answer explanation

Centroid of a rectangle lies at mid-depth (d/2) from the base.

For a plane area, the perpendicular axis theorem states Jz (polar MOI) equals:

• Ixx − Iyy
• Ixx + Iyy
• Ixx / Iyy
• Ixx × Iyy

Answer explanation

Perpendicular axis theorem: J = Ixx + Iyy for plane laminae.

Product of inertia of a plane area about its principal axes is:

• Maximum
• Minimum non-zero
• Zero
• Negative

Answer explanation

About principal axes, product of inertia is zero.

In railway engineering, 'gauge' is defined as the distance between:

• Outer faces of two rails
• Centrelines of rails
• Inner faces of running rails
• Rail heads

Answer explanation

Gauge = clear distance between inner faces of running rails.

Wheel diameter is approximately what fraction of the gauge?

• 1/2 of gauge
• 3/4 of gauge
• Equal to gauge
• Twice the gauge

Answer explanation

Given: Wheel diameter ≈ 0.75 times gauge.