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2 marksThermal Measurements

CSEC Physics · 1993 · Paper 2 · Question 2(a)(i)

Questions on specific heat capacity, thermal efficiency, and energy in power stations.

Define 'specific heat capacity'.

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  1. 2(a)(ii)Explain what is meant by the term 'efficiency'.[2 marks]
  2. 2(b)(i)State the useful energy changes taking place in an oil-fired power station.[3 marks]
  3. 2(b)(ii)In a power station, thermal energy is wasted at the rate of 660 MW. How many joules of energy are wasted in ONE second?[1 mark]
  4. 2(b)(iii)A nearby river is used to absorb the waste heat. A mass of 6 x 10^4 kg of water passes the power station every second. What is the temperature rise of the…[3 marks]
  5. 2(iv)An alternative way of disposing of the waste heat is to use it to evaporate water in the power station. How much water would have to be evaporated EACH second…[3 marks]
  6. 2(v)Electricity is produced at 6 600 V a.c. and stepped up to 132 000 V for distribution. State how the potential is raised and give ONE advantage of transmitting…[2 marks]

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