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Draw a relay construction diagram
Course:- Electrical Engineering
Reference No.:- EM13492




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1. Draw a relay construction diagram and briefly explain the operation of a relay.

2. Define the terms normally open and normally closed.

3. Define the terms Set and Reset for relays.

4. Draw a latching circuit and interlocking circuit and briefly explain the operation of those two circuits.

5. Draw an electrical relay diagram rung showing a N/O contact of CR1(coil) in series witha N/C contact of CR2(Coil), operating a lamp L1.

6. A delay-on (TON) relay has a preset of 5.0 seconds. Explain how it reacts If if the coil terminals areenergized for

a) 8 seconds how long will its contacts be actuated.

b) 3 seconds

explain how it reacts

6.7. a. Explain the operation of basic motor STOP/START circuit shown below.

1026_Roller Door Project.png

Figure: Relay Ladder Diagram for Basic STOP/START Circuit

7.8. b. The above figure below shows an OP OR gate combined with an AND gate to duplicate the logic of a ladder diagram that contains a start button, holding contacts, stop button and motor starter. 

a) State the equivalents in the ladder diagram above(figure in Question 7), for A, B and C below

a) b) Compare the logic of the ladder diagram with the logic gate equivalent circuit and

b) c) Complete the truth table below.

1230_Roller Door Project1.png

Figure: Combining an OP OR gate and an AND gate

Truth Table
A B C OUTPUT
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1




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