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- A transformer supplies a current of 13.5A at a voltage of 48v to a device from a.c. main
supply of 240V. Given the transformer is 80%...(Solved)
A transformer supplies a current of 13.5A at a voltage of 48v to a device from a.c. main
supply of 240V. Given the transformer is 80% efficient; calculate
i) The power supplied to the transformer
ii) Current in the primary coil
Date posted: April 4, 2019. Answers (1)
- The figure below shows a diagram of a simple electric generator(Solved)
The figure below shows a diagram of a simple electric generator
i) Label the parts P and Q
ii) Identify the polarities of the poles X and Y
iii) State two ways of increasing the voltage – output in this generator
Date posted: April 4, 2019. Answers (1)
- Arrange the following types of waves in order of increasing frequency:-Ultra-violet radiation,
visible light, radio waves and x-rays(Solved)
Arrange the following types of waves in order of increasing frequency:-Ultra-violet radiation,
visible light, radio waves and x-rays
Date posted: April 4, 2019. Answers (1)
- The diagram below shows a ferromagnetic material being magnetized by the method shown(Solved)
The diagram below shows a ferromagnetic material being magnetized by the method shown
On the axes given below, sketch a graph to show how the strength of the magnet being created
varies with the number of strokes
Date posted: April 4, 2019. Answers (1)
- Suggest one method of decreasing the sensitivity of a moving coil meter(Solved)
Suggest one method of decreasing the sensitivity of a moving coil meter
Date posted: April 4, 2019. Answers (1)
- Using a well- labeled diagram explain how a moving coil meter works(Solved)
Using a well- labeled diagram explain how a moving coil meter works
Date posted: April 4, 2019. Answers (1)
- The resistance of a length of power transmitting cable is 20ohms and is used to transmit 12KV
at a current of 1A. If the voltage is...(Solved)
The resistance of a length of power transmitting cable is 20ohms and is used to transmit 12KV
at a current of 1A. If the voltage is stopped up to 18KV by a transformer, determine the
power loss. (Assume the transformer is ideal)
Date posted: April 4, 2019. Answers (1)
- State one way through which energy is lost in a transformer and give a remedy for it.(Solved)
State one way through which energy is lost in a transformer and give a remedy for it.
Date posted: April 4, 2019. Answers (1)
- A steel bar can be magnetized and not an aluminum bar. Explain(Solved)
A steel bar can be magnetized and not an aluminum bar. Explain
Date posted: April 4, 2019. Answers (1)
- You are provided with a two metal bars; one is magnetized while the other is un-magnetized.
Describe briefly how you can identify the two bars without...(Solved)
You are provided with a two metal bars; one is magnetized while the other is un-magnetized.
Describe briefly how you can identify the two bars without using repulsion method
Date posted: April 4, 2019. Answers (1)
- The diagram below shows a magnetic field patterns between magnets S and R. use it to answer
questions below:-(Solved)
The diagram below shows a magnetic field patterns between magnets S and R. use it to answer
questions below:-
(a) Identify the poles A and B
(b) State which of the two magnets R and S is stronger. Explain
Date posted: April 4, 2019. Answers (1)
- Draw the magnetic field pattern in the figure below and indicate the direction of the force.(Solved)
Draw the magnetic field pattern in the figure below and indicate the direction of the force.
Date posted: April 4, 2019. Answers (1)
- Two similar pins were placed one on a wooden block and the other on an iron block. The two
blocks were placed near a magnet. State...(Solved)
Two similar pins were placed one on a wooden block and the other on an iron block. The two
blocks were placed near a magnet. State and explain the observations noted
Date posted: April 4, 2019. Answers (1)
- Use the domain theory to differentiate between hard magnetic materials and soft magnetic
materials(Solved)
Use the domain theory to differentiate between hard magnetic materials and soft magnetic
materials
Date posted: April 4, 2019. Answers (1)
- The diagram figure below shows one method of making a magnet. Complete the diagram
to make both ends A and B of the cores be North...(Solved)
The diagram figure below shows one method of making a magnet. Complete the diagram
to make both ends A and B of the cores be North poles
Date posted: April 4, 2019. Answers (1)
- The diagram figure below shows an electromagnet made by a student of Nyamogo Girls
secondary school, in the laboratory. The magnet was meant to pick up...(Solved)
The diagram figure below shows an electromagnet made by a student of Nyamogo Girls
secondary school, in the laboratory. The magnet was meant to pick up and release a metal object
(i) Name giving reasons a suitable material for part X
(ii) The electromagnet will just lift a metal of mass 150g. Taking g = 10N/Kg, what will be the
least force exerted by the magnet to do this
(iii) State the changes which the student should make so that a heavier metal object could be
lifted by the magnet
(iv) Explain why the strength of the above magnet cannot be increased indefinitely
Date posted: April 4, 2019. Answers (1)
- Draw the magnetic field pattern around the magnets below.(Solved)
Draw the magnetic field pattern around the magnets below.
Date posted: April 4, 2019. Answers (1)
- Two pins are attached to each of the magnets as shown below.(Solved)
Two pins are attached to each of the magnets as shown below.
Explain the behaviour of pins in each case.
Date posted: April 4, 2019. Answers (1)
- The figure below shows a micrometer screw gauge being used to measure the diameter of a rod.
The thimble scale has 50 divisions.(Solved)
The figure below shows a micrometer screw gauge being used to measure the diameter of a rod.
The thimble scale has 50 divisions.
What is the reading?
Date posted: April 4, 2019. Answers (1)
- A gold leaf electroscope is positively charged as shown in the diagram in figure where C is the cap and L is the gold leaf....(Solved)
A gold leaf electroscope is positively charged as shown in the diagram in figure where C is the cap and L is the gold leaf. State and explain what happens to L when a positively charged rod is
brought near C without touching it.
Date posted: April 4, 2019. Answers (1)