ELEN 30173 Final Exam

What is the formula for pressure?

• P = F + A
• P = F × A
• P = F/A
• P = FA

Which pressure term includes atmospheric pressure?

• Gauge pressure
• Hydrostatic pressure
• Static pressure
• Absolute pressure

A gas at 4 psia and 3 ft³ is compressed to 8 psia (constant temperature). What is the new volume?

• 1.5 ft³
• 0.75 ft³
• 3 ft³
• 6 ft³

Which instrument measures ultra-high vacuum (10⁻⁹ torr)?

• Manometer
• McLeod gauge
• Bourdon tube
• Pitot tube

A U-tube manometer uses a liquid with SG = 2.95. If the gas pressure is 3 psig, what is the displacement (in inches)?

• 28.21 in
• 10.5 in
• 35.0 in
• 83.22 in

What is the sensitivity of a sensor with 10 mV/psi output?

• 100 mV/psi
• 0.1 psi/mV
• 1 psi/mV
• 10 mV/psi

A pressure transmitter has a span of 0–100 psi. If accuracy is ±0.5% FS, what is the error at 60 psi?

• ±0.3 psi
• ±0.05 psi
• ±0.6 psi
• ±0.5 psi

What is the relationship between absolute, gauge, and atmospheric pressure?

• Patm = Pabs − Pgauge
• Pabs = Pgauge − Patm
• Pgauge = Pabs + Patm
• Pabs = Pgauge + Patm

Which device uses a bourdon tube?

• Thermocouple
• RTD
• Pressure gauge
• Displacer

A gas sample at 4 psia and 3 ft³ increases to 8 psia (constant temperature). What is the new volume?

• 0.75 ft³
• 6 ft³
• 1.5 ft³
• 3 ft³