ESAS 4-2

A pump has an efficiency of 65%. It is driven by a 0.75 horsepower motor. The pump produces a pressure rise of 120 Pa in water. What is the required flow rate?

• 3.03 m³/s

• 4.04 m³/s

• 4.55 m³/s

• 4.66 m³/s

What is the tensile load if a 1/2" × 4" × 12' steel tie rod experiences an 80°F temperature decrease from the no-stress temperature?

• 92,346 lb

• 47,120 lb

• 31,200 lb

• 52,130 lb

The rate of return for a P10,000 investment that will yield P1,000 per year for 20 years is closest to

• 2%

• 4%

• 8%

• 16%

The overall energy program formulated and updated yearly by the DOE and submitted to Congress pursuant to R.A. 7638.

• Power Development Plan (PDP)

• Philippine Energy Plan (PEP)

• Philippine Electrical Code (PEC)

• Preliminary Project Planning Data (PPPD)

The work of a polytropic (n = 1.21) compression of air (cₚ/cᵥ = 1.4) in a system with moving boundary from P₁ = 15 psia, V₁ = 1.0 cu. ft. to P₂ = 150 psia, V₂ = 0.15 cu. ft. is

• 1080 ft-lb

• 5150 ft-lb

• 6882 ft-lb

• 2700 ft-lb

One Newton is equivalent to

• 10⁵ dyne

• 10⁸ dyne

• 10⁷ dyne

• 10⁶ dyne

An adiabatic process with no work done is

• isometric

• throttling

• isobaric

• polytropic

Article IV Rule __. Requirements form examination as a REE.

• 14

• 15

• 16

• 17

The phenomenon known as corrosion in metals is by nature

• chemical

• organic

• electrochemical

• electrical

A force causing a rise in liquid in tubes of small diameter.

• cohesion

• surface tension

• capillarity

• adhesion