1. Make the representative symbols for each of the following
electrical components:
I. a cell. ii. a switch iii. a diode iv . capacitor
b. Make a pictorial sketch of :
I. a dot punch. ii . a hacksaw iii . the hand trowel.
c .I. label the parts of the tools above.
ii. state two uses of each tool.
2. List two specific tools each doe carrying out each of the following operations
I. setting out a foundation ;
II. moulding bricks ;
III. cutting a mortisen a piece of wood ;
IV. soldering ahwwt metal.
3. Copy and complete the table below.
NAME OF MATETIAL.
1. cast iron
2. Polyvinyl Chloride (PVC)
3. Odum
4.Sand
ONE PROPERTY EACH
1.
2.
3.
4.
ONE USE EACH
1.
1.
3.
4.
NB: Put your answers in a table form.
Answers
Answer:
WHAT?!!
seriously...this seems so much like your homework u know
Explanation:
Answer:
Question 695: [Sensing devices]
(a) State name of an electrical sensing device that will respond to changes in
(i) length
(ii) pressure
(b) Relay is sometimes used as the output of a sensing circuit.
Output of particular sensing circuit is either +2V or -2V.
On Fig.1, draw symbols for relay and any other necessary component so that the external circuit is switched on only when the output from the sensing circuit is +2V.
Reference: Past Exam Paper – June 2010 Paper 42 & 43 Q10
Solution 695:
(a)
(i) Strain gauge
(ii) Piezo-electric / quartz crystal / transducer
(b) For the circuit, a coil of relay is connected between the sensing circuit output and earth and the switch is across the terminals of the external circuit.
A diode is connected in series with the coil with a correct polarity for the diode (downwards). A second diode with correct polarity is connected (upwards and parallel to coil of relay).