| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.SL.TZ2.6 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 6 | Adapted from | N/A |
Question
An electric motor is used to lift a heavy load. The Sankey diagram shows the energy transformations involved in the process.
What is the efficiency of the motor?
A. 33%
B. 50%
C. 67%
D. 75%
Markscheme
D
Examiners report
[N/A]
Syllabus sections
Show 128 related questions
- 17N.1.SL.TZ0.27: The energy density of a substance can be calculated by multiplying its specific energy...
- 17N.1.SL.TZ0.26: Which of the energy sources are classified as renewable and non-renewable?
- 17M.2.HL.TZ2.2c.iv: Not all the stored energy can be retrieved because of energy losses in the system. Explain...
- 17M.2.HL.TZ2.2c.iii: The hydroelectric system has four 250 MW generators. Determine the maximum time for which...
- 17M.2.HL.TZ2.2c.ii: The water in a particular pumped storage hydroelectric system falls a vertical distance of...
- 17M.2.HL.TZ2.2c.i: Outline, with reference to energy changes, the operation of a pumped storage hydroelectric...
- 17M.2.SL.TZ2.2d: At the location of the hydroelectric system, an average intensity of 180 W m–2 arrives at the...
- 17M.2.SL.TZ2.2c: Not all the stored energy can be retrieved because of energy losses in the system. Explain...
- 17M.2.SL.TZ2.2b: The hydroelectric system has four 250 MW generators. The specific energy available from the...
- 17M.2.SL.TZ2.2a: Outline, with reference to energy changes, the operation of a pumped storage hydroelectric...
- 17M.2.SL.TZ1.3c.ii: Explain two reasons why the number of turbines required is likely to be greater than your...
- 17M.2.SL.TZ1.3c.i: Determine the minimum number of turbines needed to generate the same power as the solar farm.
- 17M.2.SL.TZ1.3b: A solar farm is made up of photovoltaic cells of area 25 000 m2. The average solar intensity...
- 17M.2.SL.TZ1.3a: Describe the difference between photovoltaic cells and solar heating panels.
- 17M.1.SL.TZ2.28: The main role of a moderator in a nuclear fission reactor is to A. slow down neutrons. B....
- 17M.1.SL.TZ1.28: The following are energy sources. I. a battery of rechargeable electric cellsII. crude...
- 17M.1.SL.TZ1.15: Two pulses are travelling towards each other. What is a possible pulse shape when the...
- 16N.2.SL.TZ0.8d: Describe, in terms of energy transfers, how thermal energy of the burning gas becomes...
- 16N.2.SL.TZ0.8c: Explain, using your answer to (b), why countries are being asked to decrease their dependence...
- 16N.2.SL.TZ0.8b: Calculate the mass of CO2 generated in a year assuming the power station operates continuously.
- 16N.2.SL.TZ0.8a: Calculate, with a suitable unit, the electrical power output of the power station.
- 16N.1.SL.TZ0.29: Which of the following is not a primary energy source? A. Wind turbine B. Jet Engine C....
- 16N.1.SL.TZ0.30: What are the principal energy changes in a photovoltaic cell and in a solar heating panel?
- 16N.1.SL.TZ0.28: The Sankey diagram represents the energy flow for a coal-fired power station. What is the...
- 16M.1.SL.TZ0.29: ...
- 16M.1.SL.TZ0.28: ...
- 15M.1.SL.TZ1.26: In nuclear power production, what is one advantage of a nuclear fusion reactor over a nuclear...
- 15M.1.SL.TZ1.27: The Earth rotates about an axis XY, as shown below. P and Q are positions on the Earth’s...
- 15M.1.SL.TZ1.28: Which type of power-production system is most suitable for responding to a sudden high...
- 15M.1.SL.TZ2.26: What is the purpose of the moderator in a nuclear power station? A. To absorb fast moving...
- 15M.2.SL.TZ1.4a: Suggest the conditions that would make use of wind generators in combination with either oil...
- 15M.2.SL.TZ1.4b: Conventional horizontal-axis wind generators have blades of length 4.7m. The average wind...
- 15M.2.SL.TZ1.4c: The energy flow diagram (Sankey diagram) below is for an oil-fired power station that the...
- 15M.2.SL.TZ1.4d: The emissions from the oil-fired power station in (c) are likely to increase global warming...
- 15M.2.SL.TZ1.4e: Nuclear fuel must be enriched before it can be used. Outline why fuel enrichment is needed.
- 15M.2.SL.TZ1.4f: The nuclear equation below shows one of the possible fission reactions in a nuclear...
- 15M.2.SL.TZ1.4g: A nuclear reactor requires both control rods and a moderator to operate. Outline, with...
- 15M.2.HL.TZ1.6a: Suggest the conditions that would make use of wind generators in combination with either oil...
- 15M.2.HL.TZ1.6b: Conventional horizontal-axis wind generators have blades of length 4.7 m. The average wind...
- 15M.2.SL.TZ2.4a: (i) Determine the diameter that will be required for the turbine blades to achieve the...
- 15M.2.SL.TZ2.4b: Currently, a nearby coal-fired power station generates energy for the community. Less coal...
- 14M.1.SL.TZ1.25: A natural gas power station has an output of 600 MW and an efficiency of 50%. The mass of...
- 14M.1.SL.TZ1.27: Which of the following best defines non-renewable fuels? A. They produce a lot of degraded...
- 14M.1.HL.TZ1.38: In a hydroelectric power plant, water of density 103kgm–3 falls through an average height of...
- 14M.1.SL.TZ2.27: In the production of energy from nuclear fission, fuel enrichment means increasing, in the...
- 14M.1.SL.TZ2.28: In a wind generator, the kinetic energy of the wind cannot be completely converted into...
- 14M.2.SL.TZ1.2a: (i) Show that the mass of sea water released between successive high and low tides is about...
- 14M.2.SL.TZ1.2b: (i) Identify one mechanism through which energy is transferred to the surroundings during the...
- 15N.2.SL.TZ0.5a: Outline which of the three generation methods above is renewable.
- 15N.2.SL.TZ0.5c.i: Determine the maximum amount of energy, in joule, released by 1.0 g of uranium-235 as a...
- 15N.2.SL.TZ0.5b.i: heat exchanger.
- 15N.2.SL.TZ0.5b.ii: moderator.
- 15N.2.SL.TZ0.5d.i: Describe the main principles of the operation of a pump storage hydroelectric scheme.
- 15N.2.SL.TZ0.5d.ii: A hydroelectric scheme has an efficiency of 92%. Water stored in the dam falls through an...
- 14N.2.HL.TZ0.3b.i: Determine the mass of U-235 that undergoes fission in the reactor every day.
- 14N.2.HL.TZ0.3c: In addition to the U-235, the nuclear reactor contains graphite that acts as a moderator....
- 14N.2.HL.TZ0.3d: Outline how energy released in the nuclear reactor is transformed to electrical energy.
- 14N.2.HL.TZ0.3b.ii: Calculate the power output of the nuclear power station.
- 14N.2.SL.TZ0.5e.ii: control rods.
- 14N.2.SL.TZ0.6b: With reference to the energy transformations and the operation of the devices, distinguish...
- 14N.2.SL.TZ0.6c.ii: State two reasons why the intensity of solar radiation at the location of the panel is not...
- 14N.2.SL.TZ0.5d.i: Determine the mass of U-235 that undergoes fission in the reactor every day.
- 14N.2.SL.TZ0.5e.i: moderator.
- 14N.2.SL.TZ0.6d.ii: Comment on whether it is better to use a solar heating panel rather than an array of...
- 14N.2.SL.TZ0.5d.ii: Calculate the power output of the nuclear power station.
- 14N.2.SL.TZ0.6a: The Sun is a renewable energy source whereas a fossil fuel is a non-renewable energy source....
- 14N.2.SL.TZ0.6c.i: Determine the efficiency of the photovoltaic panel.
- 14N.2.SL.TZ0.6d.i: Calculate the minimum area of solar heating panel required to provide this power.
- 14M.2.SL.TZ2.4d: (i) State the principle of conservation of momentum. (ii) Show that the speed of the...
- 11N.1.SL.TZO.26: In a nuclear fission reaction neutrons are passed through a moderator. The reason for this is...
- 11N.1.SL.TZO.27: Wind of speed v is incident normally on a wind turbine of radius r. The maximum theoretical...
- 12N.1.SL.TZ0.25: Which energy resource is renewable? A. Natural gasB. UraniumC. BiogasD. Coal
- 13N.1.SL.TZ0.27: What is the main role of the control rods and the main role of the moderator in a thermal...
- 13N.1.HL.TZ0.34: In the production of electric power, an advantage of using photovoltaic cells rather than...
- 13N.1.SL.TZ0.26: In the production of electric power, an advantage of using photovoltaic cells rather than...
- 13M.1.HL.TZ1.35: In a nuclear fission reactor, the role of the moderator is to A. absorb neutrons to shut...
- 12M.1.SL.TZ2.24: Which of the following is the primary function of the moderator in a nuclear power...
- 12M.1.SL.TZ1.27: The original source of the electrical power produced by a wind generator is A. the Sun’s...
- 12M.1.SL.TZ2.28: The property of the molecules of greenhouse gases which leads to their ability to absorb...
- 12M.1.SL.TZ1.26: In a nuclear power station, in order to increase the chances of a chain reaction A. kinetic...
- 13M.2.SL.TZ1.8a: (i) Outline, with reference to the energy conversions in the machine, the main features of a...
- 13M.2.SL.TZ1.8c: Distinguish between photovoltaic cells and solar heating panels.
- 13M.2.SL.TZ1.8e: The intensity of the Sun’s radiation at the position of the Earth’s orbit (the solar...
- 12M.1.SL.TZ2.26: The blades of a certain wind turbine X have radius r. The maximum theoretical available wind...
- 12M.1.HL.TZ2.34: The rate of formation of a non-renewable energy resource is A. greater than the rate of...
- 13M.2.SL.TZ2.9c: The average solar intensity incident at the surface of the Earth is 238 W m–2. (i) Assuming...
- 11M.1.SL.TZ2.27: Which of the following processes leads to the...
- 13M.2.SL.TZ2.9a: A coal-fired power station has a power output of 4.0GW. It has been suggested that a wind...
- 13M.2.SL.TZ2.9b: Wind power does not involve the production of greenhouse gases. Outline why the surface...
- 11M.1.SL.TZ2.25: The Sankey diagram of a fossil-fuelled power station is...
- 11M.1.SL.TZ2.26: World energy resources include coal, nuclear fuel...
- 11M.1.HL.TZ2.34: World energy resources...
- 12M.1.HL.TZ1.35: In a nuclear power station, in order to increase the chances of a chain reaction A. kinetic...
- 13M.1.SL.TZ2.25: The use of which energy source enhances the greenhouse effect the most? A. WoodB. CoalC....
- 13M.1.SL.TZ2.27: Which of the following correctly describes the energy transformation within photovoltaic...
- 11M.2.SL.TZ2.6b: A nuclear power station uses...
- 11M.2.SL.TZ2.6e: The Drax power station...
- 11M.2.SL.TZ2.7b: Two plastic...
- 12M.2.SL.TZ2.8a: Distinguish, in terms of the energy changes involved, between a solar heating panel and a...
- 12M.2.SL.TZ2.8b: State an appropriate domestic use for a (i) solar heating panel. (ii) photovoltaic cell.
- 12M.2.SL.TZ1.4c: Air is incident normally on a wind turbine and passes through the turbine blades without...
- 12M.2.SL.TZ1.4a: Outline in terms of energy changes how electrical energy is obtained from the energy of wind.
- 12M.2.SL.TZ1.4e: Outline one advantage and one disadvantage of using wind turbines to generate electrical...
- 12M.2.SL.TZ1.4b: Air of density ρ and speed v passes normally through a wind turbine of blade length r as...
- 12M.2.SL.TZ1.4d: A wind turbine has a mechanical input power of 3.0×105W and generates an electrical power...
- 11N.2.SL.TZ0.3a: A nuclide of deuterium \(\left( {{}_{\rm{1}}^2{\rm{H}}} \right)\) and a nuclide of...
- 12N.2.HL.TZ0.8b: Outline why uranium ore needs to be enriched before it can be used successfully in a nuclear...
- 12N.2.HL.TZ0.8d: Some waste products in nuclear reactors are good absorbers of neutrons. Suggest why the...
- 13N.2.SL.TZ0.3a: State two advantages of power production using fossil fuels compared to using nuclear fuels.
- 11M.1.SL.TZ1.27: A wind turbine produces a power P when the wind speed is v. Assuming that the efficiency of...
- 11M.1.SL.TZ1.29: The design of a nuclear power station includes an electrical generator. The function of the...
- 11M.2.SL.TZ1.4c: Explain what would happen if the moderator of this reactor were to be removed.
- 11M.2.SL.TZ1.4b: The reactor produces 24 MW of power. The efficiency of the reactor is 32 %. In the fission of...
- 11M.2.SL.TZ1.4d: During its normal operation, the following set of reactions takes place in the...
- 09M.1.SL.TZ1.26: The energy source that currently provides the greatest proportion of the world’s total energy...
- 09M.1.SL.TZ1.27: In a nuclear power station, uranium is used as the energy source and plutonium-239 is...
- 09M.1.SL.TZ1.28: One disadvantage of using photovoltaic cells to power a domestic water heater is that A. ...
- 10M.1.SL.TZ1.28: Which of the following correctly shows the energy change in a photovoltaic cell and in a...
- 10M.1.SL.TZ1.27: Which of the following correctly describes both the role of the moderator and of the control...
- 09N.1.SL.TZ0.30: In a nuclear power station, a moderator is required to A. control the rate of...
- 09N.1.SL.TZ0.25: Which of the following energy sources results from the solar energy incident on Earth? A. ...
- 09N.1.SL.TZ0.26: Which of the following is a renewable and non-renewable energy source?
- 10N.1.HL.TZ0.37: Which of the following statements, relating to the production of nuclear power, is...
- 10N.2.HL.TZ0.A2b.ii: All the energy output of the room heater raises the temperature of the air moving through it....
- 10N.2.SL.TZ0.B2Part2.a: Define the energy density of a fuel.
- 10N.2.SL.TZ0.B2Part2.b: (i) Use the data to calculate the power output of the room heater, ignoring the power...
- 10N.2.SL.TZ0.B3Part1.b: Outline the role of the moderator.
- 10N.2.SL.TZ0.B3Part1.c: A nuclear power plant that uses U-235 as fuel has a useful power output of 16 MW and an...
