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Why do transformers make noise?
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Transformers make noise based on it out put if an transformer outputs is 400v maximum than a 398v be apply to that transformer it also make a noise because of that 

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Define the term electrical noise. List types of noises.

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Electrical Noise:- It can be defined as undesirable electrical signals, which distort or interfere with an original (or desired) signal.  Types of noises:- 

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Define the following terms : 1) Noise margin 2) Power fanout 3) Skew 4) Meta stability

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1) Noise Margin: It is a measure of noise immunity of a gate or circuit (noise immunity is the ability of a gate or circuit to tolerate any noise present in a signal without performing a wrong operation) ... OR  A metastable state is half way between logic 0 and logic 1 .It is undefined state.

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Compare between BJT and FET on the basis of (i) Biolar/Unipolar (ii) Tharmal Runaway (iii) Noise (iv) Applications

Answer :

Parameter BJT FET Bipolar/Unipolar It is bipolar device i.e. current in this device is carried by electrons and holes. It is unipolar device i.e. current ... in oscilloscopes, electronic voltmeters and other measuring and testing equipment because of their high input impedance.

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Switching of a lamp in house produces noise in the radio. This is because switching operation produces?

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Switching of a lamp in house produces noise in the radio. This is because switching operation produces arcs across separating contacts.

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The noise produced by a transformer is termed as?

Answer :

The noise produced by a transformer is termed as hum.

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Answer :

Transformer noise is generated due to vibration of core and winding this is because of magnetostriction and magnetomotive force.

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Description :

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in?

Answer :

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in loading of the transformers not in proportion to their kVA ratings.

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Losses which occur in rotating electric machines and do not occur in transformers are?

Answer :

Friction losses windage losses 

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Description :

Classify the transformers based on the construction, frequency and power.

Answer :

Classification of Transformer Based On: i) Construction: Shell type, Core type, Berry type ii) Change in voltage level: Step-Up, Step-Down, iii) Number of phases: Single phase, Three phase iv) ... Control vi) Cooling: Self-cooled, Air-cooled, Forced-air cooled, Oil-cooled, Forced-oil cooled. 

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Description :

Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

Answer :

Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

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Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances of 4 and 2 are operating in parallel. The transformer A will be overloaded by 

Answer :

Two transformers A and B having equal outputs and voltage ratios but unequal percentage impedances of 4 and 2 are operating in parallel. The transformer A will be overloaded by 33%

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Description :

Core type transformers are popular in___________.  (A) High voltage applications (B) Low voltage applications (C) All of the above (D) None of the above

Answer :

Core type transformers are popular in High voltage applications

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In a transmission line if booster transformers are to be used, preferred location will be  (A) At the receiving end (B) At the sending end (C) At the intermediate point (D) Anywhere in the line 

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In a transmission line if booster transformers are to be used, preferred location will be At the intermediate point

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The friction losses in Real Transformers are :  (A) 0% (B) 5% (C) 25% (D) 50%

Answer :

A

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Two 3-phase transformers cannot be operated in parallel, if their :  (A) kVAs are different (B) phase sequences are different (C) % impedances are different (D) voltage ratios are different

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Two 3-phase transformers cannot be operated in parallel, if their : phase sequences are different

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An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

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An additional condition for parallel operation of three-phase transformers over single-phase transformers is that the transformers should belong to the same vector group

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Description :

Which of the following is the advantage of using CRGO steel in transformers? A) High magnetic flux density B) Low permeability C) Both A and B D) None of these

Answer :

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Answer :

Instrument transformers are potential transformers, current transformers.

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Natural oil cooling is used for transformers up to a rating of 3000 kVA.

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Description :

If the percentage impedances of the two transformers working in parallel are different, then?

Answer :

If the percentage impedances of the two transformers working in parallel are different, then parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load.

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Distribution transformers are generally designed for maximum efficiency around 50% load.

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Power transformers are generally designed to have maximum efficiency around near full-load.

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Short circuit test on transformers is conducted to determine copper losses.

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Necessary conditions required to be satisfied in order to ensure successful parallel operation of single phase transformers:  1. Only transformers having the same phase displacement between primary and secondary ... . 7. The phase sequence must be followed strictly on HV and LV side connection.

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Natural air cooling is generally restricted for transformers up to 1.5 MVA .

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The efficiency of two identical transformers under load conditions can be determined by?

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The efficiency of two identical transformers under load conditions can be determined by back-to-back test.

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The efficiencies of transformers compared with that of electric motors of the same power are?

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Transformers have high efficiency than the same ratted motors

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What is the back EMF in Transformers?

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Why circuit breaker connect b)w two transformer  (same rating

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State any two conditions for parallel operation of 3-phase transformer.

Answer :

Conditions for Parallel operation of 3 phase transformer 1) Voltage ratings of both the transformers must be identical. 2) Percentage or p.u. impedance should be equal in magnitude. 3) X/R ratio ... between primary & secondary voltages must be same. 6) Phase sequence on both sides must be same.

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Compare core type transformer and shell type transformer on the following parameters. (i) Types of winding used, (ii) Application

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Define transformation ratio in terms of current and voltage.

Answer :

(i) Transformation Ratio (K) is defined as the ratio of the primary current to the secondary current.  (ii) Transformation Ratio (K) is defined as the ratio of the secondary voltage to the primary voltage.

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Define: (i) Commercial efficiency of a transformer and  (ii) All day efficiency of a transformer.

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(i) Commercial Efficiency : It is the ratio of output power in watt to the input power in watt. (ii) All day efficiency of a transformer: It is the ratio of output energy in kWh to the input energy in kWh in the 24 hours of the day

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Description :

A 50 KVA transformer has iron loss 2 kW on full load. Calculate its iron loss at 75% of full load.

Answer :

Iron loss is dependent on voltage and independent of load. Hence iron loss at 75% of Load = Iron loss at full load = 2 kW

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State any four properties of Ideal transformer.

Answer :

Properties of Ideal transformer: 1) No losses (iron and copper losses), hence no temperature rise. 2) No magnetic leakage i.e (Coefficient of coupling between primary and secondary windings is unity) 3) Zero winding ... drop i.e. E1 = V1, E2 = V2 5) Efficiency 100 %. 6) Regulation 0 %.

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Draw the connection diagram of long shunt differential D.C. compound generator.

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A common method of cooling a power transformer is oil cooling.

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Harmonics in transformer result in increased core losses, increased I2R losses, and magnetic interference with communication circuits.

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Why do you support the five stage method of Herbart? Options: A) In this there is no scope for individual diversity of students. B) Under this, generalization is not required to be done while teaching subjects like language, history, geography etc. C) In this method, it is difficult to make co-ordination between various subjects. D) All of these

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D) All of these 

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Why do teachers use teaching aid? Options: A) To make teaching fun-filled B) To teach within understanding level of students C) For students’ attention D) To make students attentive

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B) To teach within understanding level of students 

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Why do teachers use teaching aid? (A) To make teaching fun-filled (B) To teach within understanding level of students (C) For students’ attention (D) To make students attentive

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(B) To teach within understanding level of students

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Excessive noise in operation/ Compressor make noise

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Causes remedial action 1. Loose pulley, flywheel, belt, belt guard, cooler, clamps or accessories. Tighten any loose ends. 2. Lack of oil in crankcase. Check for possible damage ... a good idea to replace your vibration pads 5. Defective crankcase. Repair or replace.

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State and explain the faults occur in the transformers.

Answer :

Sr. No. Type of fault Explanation 1 Earth fault Due to breakdown of insulation between live conducting parts such as winding, terminals etc. and earthed metallic parts such as ... place and few turns of the same winding are shortcircuited, the inter-turn fault takes place.

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