The input power to a motor is 300 W. In 20 s it lifts a load of 400 N through a height of 6.0 m. What is the efficiency of the motor?

5054_s06_qp_1

MCQ

2006

Paper 1, Variant 0

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Which formula gives the efficiency of an energy conversion?

5054_s07_qp_1

MCQ

2007

Paper 1, Variant 0

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Energy from petrol is used to operate an engine. The engine drives a generator, which produces electrical energy. generator engine energy from petrol work done by engine electrical energy 400 J 120 J 100 J What is the overall efficiency of the process?

5054_s08_qp_1

MCQ

2008

Paper 1, Variant 0

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A crane lifts a load of 1000 N through a vertical height of 3.0 m in 10 s. The input power to the crane is 500 J / s. What is the efficiency of the crane?

5054_s09_qp_1

MCQ

2009

Paper 1, Variant 0

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A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficiency of the crane?

5054_s11_qp_11

MCQ

2011

Paper 1, Variant 1

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A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficiency of the crane?

5054_s11_qp_12

MCQ

2011

Paper 1, Variant 2

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What is efficiency?

5054_s12_qp_12

MCQ

2012

Paper 1, Variant 2

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The diagram shows the energy transfer through a machine. input energy machine useful output energy wasted energy The machine is 50% efficient. Which equation is correct?

5054_s13_qp_11

MCQ

2013

Paper 1, Variant 1

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The diagram shows the energy transfer through a machine. input energy machine useful output energy wasted energy The machine is 50% efficient. Which equation is correct?

5054_s13_qp_12

MCQ

2013

Paper 1, Variant 2

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Three solar panels have a total area of 7.2 m2. Together, they produce 1.0 kW of power. An area of 1.0 m2 of each panel receives 0.80 kJ of energy from the Sun in 1.0 s. What is the efficiency of the solar panels?

5054_s19_qp_12

MCQ

2019

Paper 1, Variant 2

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