Instrumentation Exam Prep Quiz

A tank containing neon is measured at 143 kPa at 32°C. What would the pressure of the tank be at 43°C?

• 135.72 kPa
• 148.15 kPa

• 152.36 kPa
• 140.21 kPa

Answer explanation

P2= P1 *((43+273.15)/(32+273.15))

P2= 148.15

A tank contains a gas with a volume of 32L with a pressure of 95 kPa at a temperature of 33°C. If the temperature of the tank was to drop to STP what would the volume of the gas be?

• 28.55L

• 31.23L

• 33.80L

• 30.19L

Answer explanation

V2= 32 * ((0+273.15)/(33+273.15))

V2= 28.55L

If a balloon filled with helium at 20°C and 1 atm of pressure expands from 1L to 2L at a constant temperature, what will be the new pressure of the balloon?

• 0.5 atm

• 1 atm

• 1.5 atm

• 2 atm

Answer explanation

P2= (1 * 1)/2

P2= 0.5

A cylinder contains oxygen gas at 27°C and 562 kPa. If the temperature is increased to 327°C, what will be the final pressure of the gas, assuming the volume remains constant?

• 253.58 kPa

• 532.61 kPa

• 473.53 kPa

• 1123.72 kPa

Answer explanation

P2= 562 * ((27+273.15)/(327+273.15))

P2= 1123.72

A cylinder contains a gas measured at 219 kPa and 43L at 38°C. What is the pressure when the volume is 58L and the temperature is 73? Round to the nearest whole number. (Hint: Combined law)

• 181L

• 219L

• 193L

• 179L

Answer explanation

P2 = (P1*T2*V1)/(T1*V2)

P2 = (219*(73+273.15)*43)/((38+273.15)*58)

P2 = 180.62552

P2 = 181

How many inches of water column is 1 PSI?

• 27.68

• 12.34
• 15.67
• 20.45

A pressure gauge at the bottom of a tank reads 482 cm/H2O. If the SG of the liquid in the tank is 1.2313, what is the level of the liquid in the tank? (The SG of H2O is 1)

• 593.49 cm

• 391.46 cm

• 482 cm

• Not enough information

Answer explanation

H2O: 482 cm / SG

H2O: 482 cm / 1 = 482 cm

Mystery Liquid: 482 cm / SG

Mystery Liquid: 482 cm / 1.2313 = 391.46 cm

A pressure gauge at the bottom of a tank reads 372 cm/H2O. If the SG of the liquid in the tank is 0.8345, what is the level of the liquid in the tank? (The SG of H2O is 1)

• 446 cm

• 310 cm

• 372 cm

• Not enough information

Answer explanation

H2O: 482 cm / SG

H2O: 482 cm / 1 = 482 cm

Mystery Liquid: 482 cm / SG

Mystery Liquid: 482 cm / 1.2313 = 391.46 cm

The atmospheric pressure outside a pipe is 14.7 PSI. The end of the pipe is pumped to 3 PSI. How far up the pipe will the water rise? (1 PSI = 27.68 in-H2O)

• The water will fill the pipe no matter the internal pressure.

• The water will not rise

• 26.99 ft

• 14.7 ft

Answer explanation

Rise = (14.7-3) * 27.68

Rise = 323.856 / 12

Rise = 26.99 ft

The atmospheric pressure outside a pipe is 32.9 PSI. The end of the pipe is pumped to 0.3 PSI. How far up the pipe will the water rise? (1 PSI = 27.68 in-H2O)

• The water will fill the pipe no matter the internal pressure.

• 54 ft

• 75 ft

• 32.9 ft

Answer explanation

Rise = (14.7-3) * 27.68

Rise = 323.856 / 12

Rise = 26.99 ft