DAY 14 CIVILWAR KWA (8/10)(LEVELLING & PNEUMATICS )

Front

An observer at 30 m above sea level sees a luminous point on a hill 60 km away just above the horizon. Find the height of the hill.

Back

101.73 m

Answer explanation

Use horizon-distance relation h = 0.0673 D^2 (h in m, D in km). Observer horizon ≈ 21.11 km; remaining distance ≈ 38.89 km ⇒ hill height ≈ 0.0673×(38.89)^2 ≈ 101.73 m.

Front

In levelling operations, which combination correctly represents a rise or fall between consecutive points?

Back

Both (b) and (c)

Answer explanation

Rise/fall is based on consecutive staff reading differences: Decrease in staff reading → Rise; Increase → Fall. Hence (b) and (c) are correct.

Front

What is the correction for curvature for a sight length of 800 m (0.8 km)?

Back

0.05024 m

Answer explanation

Curvature correction Cc = 0.0785 D^2 (D in km). With D = 0.8 km, Cc = 0.0785×0.64 ≈ 0.05024 m.

Front

Which method of levelling gives only approximate elevations, hence used mainly for reconnaissance or preliminary survey?

Back

Barometric levelling

Answer explanation

Barometric levelling infers elevation from atmospheric pressure; accuracy is limited and best for reconnaissance.

Front

In an auto level, to eliminate parallax between the staff image and the reticle, which operation is essential?

Back

Turn the focusing knob

Answer explanation

Correct focusing removes apparent relative movement between image and crosshairs (parallax).

Front

What is the correct sequence of components in a properly installed FRL unit from compressor to actuator?

Back

Filter → Regulator → Lubricator

Answer explanation

Air should be cleaned first (Filter), then pressure set (Regulator), then oil mist added (Lubricator).

Front

In a pneumatic system, what is the function of the filter in the FRL unit?

Back

Remove dust, dirt, and moisture from compressed air

Answer explanation

Filters protect valves and actuators from particulate and condensate contamination.

Front

What does the regulator in an FRL unit maintain?

Back

Constant outlet pressure irrespective of input variations

Answer explanation

A pressure-reducing regulator with feedback maintains set downstream pressure.

Front

Which one of the following is not an advantage unique to pneumatic systems? Options: Low-cost layout, High rate of production, Cleaner working environment, Capability for extremely high-force transmission

Back

Capability for extremely high-force transmission

Answer explanation

Pneumatics operate at relatively low pressures; extremely high forces typically require hydraulics.

Front

The component that allows air to flow in one direction only in pneumatic circuits is the ________.

Back

Check valve

Answer explanation

A check valve (non-return valve) permits flow in only one direction and blocks reverse flow.