Building Services Engineering 5th Edition Handbook

Understanding units 401
22. Which of these has the correct units?
1. 1 N = 1kg× 1m 2 .
2. 1 J = 1kg× 1m.
3. 1 W = 1kg× g m/s 2 .
4. 10 3 J = 3600 kN/m 2 .
5. 1 J = 1 N/m 2 .
23. Which of these has the correct units?
1. 1 J = 1N× 1m.
2. 1 J = 1 W/s.
3. 10 3 J = 1 kW/s.
4. 1 W = 10 3 J/s.
5. 1 MJ = 10 3 kW/s.
24. Which of these has the correct units?
1. 1 W = 1 Nms.
2. 1 W = 1 Js.
3. 1 W/s = 10 3 J.
4. 1 W = 1 Nm/s.
5. 1 kW/h = 10 3 J/h.
25. Which of these has the correct electrical units?
1. 1 MW = 10 3 W.
2. 10 3 kJ = 10 3 kW/s.
3. 1 W = 1V× 1A.
4. Electrical energy meters accumulate kW/h.
5. 10 3 W = 10 3 V × 10 3 A.
26. Which of these has the correct electrical units?
1. 10 3 kW/h = 10 3 × 3600 W/s.
2. kWh = energy.
3. 1 GJ = 10 6 V × 1A.
4. 1 MJ = 10 6 V × 1A.
5. 1 kJ/s = 10 3 V × 1A.
27. Which of these has the correct electrical units?
1. 10 3 W = 10 3 V × 1A.
2. 1 MWh = 10 3 Ws.
3. 1 kWh = 10 3 Ws.
4. 1 kWh = 1000 W/s.
5. 1 kWh = 1000 W/h.
28. Which of these has the correct units?
1. 1 atmosphere = 10 3 b.
2. 1 Pa = 1 N/m 2 .
3. Pascal is a unit of radiation measurement.
4. 1 kN/m 2 = 1b.
5. 1 mb = 10 3 N/m 2 .