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Consider the following statements regarding optocouplers: 1. Optocouplers are LEDs driving photodiodes in a single package to provide electrical isolation between input and output 2. Optocoupler is an LED driving a phototransistor in a single package that replaces pulse transformers working at input zero crossing 3. Optocouplers are used as temporary non-fixed joints between optical fiber terminations. Which of the above statements are correct?

Consider the following statements regarding optocouplers: 1. Optocouplers are LEDs driving photodiodes in a single package to provide electrical isolation between input and output 2. Optocoupler is an LED driving a phototransistor in a single package that replaces pulse transformers working at input zero crossing 3. Optocouplers are used as temporary non-fixed joints between optical fiber terminations. Which of the above statements are correct? Correct Answer 1, 2 and 3

Opto-coupler:

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  • Opto-coupler is an electronic component that transfers electrical signals between two isolated circuits by using light. It also called opto-isolator, photocoupler, or optical isolator. (Statement 1 is correct)
  • Opto-Isolator is a combination of LED and a photodiode in the same package. (Statement 2 is correct)
  • In low voltage or highly noise-sensitive circuits, the optocoupler is used to isolate circuitry to prevent electrical collision chances or to exclude unwanted noises.
  • Opto-isolators prevent high voltages from affecting the system receiving the signal.

 

Important Applications of Optocoupler:

  • To isolate low-voltage circuits from high voltages for smooth and control operation purposes.
  • Used for separation of AC and DC ground to protect control circuity or people from high voltage.
  • It is used in optical communication. Optocouplers are used as temporary non-fixed joints between optical fiber terminations.(Statement 3 is correct)
  • Used for the separation of the electric noise signal.

Related Questions

Consider the following statements: 1. Fiber optics is based on the principle of total internal reflection. 2. In an optical fiber communication system, power consumption is extremely low. 3. In India, Reliance Group of Industries is engaged in the manufacture of optical fiber. 4. Optical fiber communications are free from radio frequency interference. Which of the following statements is/are correct?
Consider the following statements regarding parallel connection of 3-phase transformers: 1. The secondaries of all transformers must have the same phase sequence. 2. The phase displacement between primary and secondary line voltages must be the same for all transformers which are to be operated in parallel. 3. The primaries of all transformers must have the same magnitude of line voltage. Which of the above statements are correct?
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: Transformers can also be used for isolation, where the voltage in equals the voltage out, with separate coils not electrically bonded to one another. B: Transformers are most commonly used for increasing low AC voltages at high current (a step-up transformer) or decreasing high AC voltages at low current (a step-down transformer) in electric power applications. C: It was discovered in 1831. D: A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another.
Consider the following given statements about auto-transformers and choose the one which is/are correct. 1. Auto-transformers require less copper as compared to a conventional,2 winding transformer of the same capacity. 2. Auto-transformers provide isolation between the primary and secondary windings. 3. Auto- transformer has less leakage reactance as compared to the conventional, 2 winding transformer of the same capacity.
Some of the physical and functional advantages of optical fiber communication are mentioned here. Select the option which tells about the functional advantages of optical fiber communication. I. The transmission bandwidth of the fiber optic cables is higher than the metal cables. II. Since these cables are di-electric, no spark hazards are present. III. Fibre optic cables last longer than copper cables. IV. The amount of data transmission is higher in fiber optic cables. V. Fibre optic cables are immune to electromagnetic interference. VI. These are not affected by electrical noise.
Optocoupler consists of a phototransistor and a led.
Consider the following statements: (a) LASER diode generates monochromatic coherent light which reduces chromatic dispersion (b) LASER source is useful for high power long-distance optical communication (c) LASERs have longer lifetime than LEDs (d) LASER diodes are less temperature-sensitive than LEDs Which of the above statements are correct?
Consider the given statement and decide which of the given assumptions is (are) implicit in the statement. Statement: Syska LEDs have the largest sales compared to any other LED manufacturing companies in India. Assumptions: I: Syska LEDs are available in 10 different wattages. II: The sales of all the LED manufacturing companies in India is known.
S1: While crossing a busy road we should obey the policeman on duty.
P: We should always cross the road at the zebra crossing.
Q: We must look to the signal lights and cross the road only when the road is clear.
R: If there are no signal lights at the crossing, we should look to the right, then to the left and again to the right before crossing the road.
S: If the road is not clear we should wait.
S6: We should never run while crossing a road.

The Proper sequence should be:
Consider the following statements regarding the advantages of optical fiber communication: 1. Enormous potential bandwidth 2. Electrical isolation 3. Immunity to interference and crosstalk. 4. System reliability and ease of maintenance. Which of the above statement are correct ?