Deck 14: Understanding Units

Question 1

Which of these equals one standard atmosphere at sea level?

A)1.01325 x 10⁵ N/m²
B)1 x 10⁵ Pascal's, Pa
C)1 x 10⁴ N/m²
D)30 m H₂O
E)1013.25 mm Hg

Answer 1

A

Question 2

Which is the Specific Heat Capacity of air?

A)Sensible heat content kJ/kg
B)1.012 kJ/kg K
C)Total heat content kJ/kg
D)1.205 kJ/kg
E)4.186 kJ/kg K

Answer 2

B

Question 3

Which is correct about the density of humid air?

A)0.802 m³/kg
B)4.186 kg/m3 at 21^oC, 60% relative humidity
C)1.013 kg/m3 at 20^oC, sea level
D)1.205 kg/m3 at 20^oC, 1013.25 mb
E)5.67 kg/m³

Answer 3

D

Question 4

Which is correct about the density of water?

A)1.2 x 10³ kg/m³
B)1 g/cm³
C)1 kg per litre
D)Specific gravity is 4.186
E)1000 tonne/m³ at 10^oC

Question 5

Which of these has the correct units?

A)1 Joule = 1 N/m²
B)1 Joule = 1 kg x 1 m
C)1 Watt = 1 kg x g m/s²
D)10³ Joules = 3600 kN/m²
E)1 Newton = 1 kg x 1 m/²

Question 6

Which of these has the correct electrical units?

A)Electrical energy meters accumulate kW/h
B)1 MW =10³ W
C)10³ kJ = 10³ kW/s
D)1 Watt = 1 volt x 1 ampere
E)10³ W = 10³ V x 10³ A

Question 7

Which of these has the correct pressure units?

A)1 b = 10⁵ N/m²
B)1.01325 mb = 1 atmosphere
C)1 MN = 10³ kN/m²
D)1 b = 1 kN/m²
E)13.6 mb = 13.6 N/m²

Question 8

Which has the correct meaning for frequency?

A)Alternating current rate of increase
B)Revolutions per minute
C)Electrical single or three phase
D)Torque of a motor
E)Air changes per hour

Question 9

Which is correct about Kelvin?

A)Degrees measured above absolute zero at -180^oF
B)Name of a famous Scottish scientist who invented the steam engine.
C)Invented first bicycle in Scotland
D)Kelvin McAdam invented tarmacadam for road surfacing
E)K = C + 273

Question 10

A room 12 m long, 8 m wide and having an average height of 4 m, has a volume of which?

A)384 m³
B)400 m³
C)62 m³
D)462 m³
E)3840 litre