Electrical Relays MCQ’s

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This set of Mechatronics Multiple Choice Questions & Answers (MCQs) focuses on “Electrical Relays”.

1. What is the full form of MCB?
a) Miniature contact breaker
b) Mini circuit breaker
c) Miniature circuit breaker
d) Mini contact breaker

2. Which electrical relay contact tip material has the highest electrical conductivity?
a) Silver
b) Alloy of silver and copper
c) Alloy of silver and tungsten
d) Alloy of silver and Nickel

3. Who invented electrical relay?
a) Grueblerowen
b) Joseph Henry
c) Philip Vaughan
d) Robert Abalakov

4. Which type of relay can be used to automatically switch between transmitter and receiver configuration from a same antenna setup?
a) Mercury relay
b) Latching relay
c) Force-guided contacts relay
d) Coaxial relay

5. Solid state relays have only one moving part which helps in switching between “ON” and “OFF” position.
a) True
b) False

6. Which type of solid state relay turns “ON” when a minimum operating control voltage is applied and the load voltage nearly reaches zero?
a) Instant ON Relays
b) Zero-Switching Relays
c) Peak Switching Relays
d) Analog Switching Relays

7. Solid state relays face high arching problems.
a) True
b) False

8. Which type of snubber network is required at the output terminal of the solid state relays to protect the semiconductor from transient spikes and unwanted noises?
a) RC (Resistor capacitor) type
b) RL (Resistor inductor) type
c) RLC (Resistor inductor capacitor) type
d) LC (Inductor capacitor) type

9. Who developed the first Solid state relay?
a) Grueblerowen
b) Walcraft engineers
c) Crydom engineers
d) Robert Conrad

10. A good electrical relay contact tip should have higher arc resistance.
a) True
b) False

11. Electro mechanical relay’s (EMR) needs to be manually turned “ON” and “OFF”.
a) True
b) False

12. Which is an example of relay?
a) KSD9700
b) XMPA06B2131
c) SLB700A/06VA
d) 792XDXM4L-24A

13. Relay and contactors perform different physical operation.
a) True
b) False

14. Which type of relay contains a glass tube which contains an inert gas which is used to protect the contacts from corrosion?
a) Polarised relay
b) Solid-state relay
c) Contactor
d) Reed relay

15. Which electrical relay contact tip material has the highest thermal conductivity?
a) Silver
b) Alloy of silver and copper
c) Alloy of silver and tungsten
d) Alloy of silver and Nickel

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