Description : Explain the different types of transformer cooling.
Answer : Types of cooling systems in a transformer : Transformer cooling may be classified as natural and forced. Oil natural, air natural Oil natural, air forced Oil forced, air natural Oil forced, air forced OIl forced, water forced
Description : State the different types of transformers. Describe the construction and general principle of transformer.
Answer : Different types of transformer are core type shell type Berry type Construction of transformer: OR Shell Type construction can be consider for diagram Transformer ... is based on the principle of mutual induction between two circuits linked by a common magnetic field.
Description : Compare core type transformer and shell type transformer on the following parameters. (i) Types of winding used, (ii) Application
Answer : Ans:
Description : Protection of transformer from all types of faults is by using (A) over current relay (B) differential relay (C) distance relay (D) Buchholz relay
Answer : Transformer noise is generated due to vibration of core and winding this is because of magnetostriction and magnetomotive force.
Description : what are the uses of current transformer ?
Answer : Uses of current transformer are as follows :A current transformer is use to measure Alternating current.A current transformer is used in meters.A current transformer is used in ammeters. ... .Current transformer is use with circuit breaker.Current transformer is use for overcurrent fault protection.
Description : Define electrovalency. What are types of electrovalency?
Answer : Definition: The number of electrons that an atom of an element gains or loses to complete its last orbit is called electrovalency. Types of Electrovalency:- 1) Positive Electrovalency 2) Negative Electrovalency
Description : what are the three different types of Electric power?
Answer : Real,reactive,apparent power
Answer : Dc machine is classified as self excited separately excited permanent magnet Self excited Dc motor is further classified as series ... are classified as long shunt short shunt
Answer : Power = voltage X Current As per the windings in the primary side and secondary side the voltage and current will change accordingly.
Description : At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W
Answer : At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : 6000 W
Description : Laminations in the transformer core are provided to avoid (a) continuous air gap (c) to reduce exiting current (b) to reduce the weight (d) to reduce copper losses
Answer : To reduce eddy current and hysterisis losses
Description : Transformer voltage is maximum when two coils are (1) Normal to each other (2) Aligned along the same axis (3) 600 away from each other (4) 2700 away from each other
Description : Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.
Answer : Those magnetic materials are best suited for making armature and transformer cores which have high permeability and low hystersis loss.
Description : How many types of types of relays are there?
Description : Horizontal axis and vertical axis are the types of (a) Nuclear Reactor (b) Wind Mills (c) Bio Gas Reactor (d) Solar Cell
Answer : Horizontal axis and vertical axis are the types of Wind Mills
Description : What is the back E.M.F in Transformer ?
Answer : Back emf in transformer is when apply voltage in primary side of transformer. This voltage produce flux according to Faraday law electro magnetic induction. This flux called mutual flux and this ... secondary flux oppos the applied voltage according to lenz law. its called back emf of transformer
Description : What is an isolation transformer? State any two applications of isolation transformer.
Answer : i) Isolation transformers are specially designed transformers for providing electrical isolation between primary & secondary windings. The transformer has primary and secondary windings placed on the common core ... ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device.
Description : State what is the significance of conducting phasing out test on a 3-phase transformer? Explain its procedure with a suitable connection diagram.
Answer : -Short primary & secondary winding of other phases expect the one under test. -Connect voltmeter to secondary winding. -A small DC current is circulated through the primary winding through ... . -The test repeated for finding out remaining concerned secondary windings in the same manner.
Description : What will be the efficiency when the transformer operates at unity power factor and 60% of full load
Answer : What will be the efficiency when the transformer operates at unity power factor and 60% of full load 96.5%
Description : What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23
Answer : What should be kVA rating of each transformer in V-V bank when three phase balanced load is 40 kVA ? (A) 19 (B) 28 (C) 37 (D) 23
Description : What will happen if the primary of a transformer is connected to D.C. supply? (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn
Answer : What will happen if the primary of a transformer is connected to D.C. supply? (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn
Description : What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be ... Current will be too much high (C) Transformer may start to smoke and burn (D) No effect
Answer : What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be ... will be too much high (C) Transformer may start to smoke and burn (D) No effect
Description : What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... in power systems to step down extra high voltage signals and provide low voltage D) None of these
Answer : What is a capacitor voltage transformer? A) It is a transformer used in power systems to step up low voltage signals and provide extra high voltage B) It is a transformer used in power systems ... power systems to step down extra high voltage signals and provide low voltage D) None of these
Description : What is the moving part of a linear variable differential transformer? a) Primary c) Secondary b) Diaphragm d) Core
Answer : What is the moving part of a linear variable differential transformer? Core
Description : What is the basic principle of operation of a transformer? (A) Self-induction (B) Mutual-induction (C) Static-induction (D) Dynamic-induction
Answer : B. Transformer works on principle of MUTUAL INDUCTION. When voltage is applied to the primary winding of the transformer, current flows through the current called magnetising current results in ... . Thus power flow from primary to secondary circuit is simply based on the mutual induction.
Answer : Much higher efficiency of transformer compared with that of electrical motors of the same power.
Answer : In short circuit test of transformer the low voltage side is short circuited . On high voltage side the voltmeter is connected in parallel and ammeter in series and also a wattmeter is ... circuit test is done for determining impedance and losses. In this test iron losses is neglected.
Description : what is transformer ?
Answer : Transformer is a device which is used to convert AC electricity from one voltage to another voltage without any change in frequency .
Description : What are the design constraints of transformer design?
Answer : Design constraints of transformer design: Core loss, flux density, copper loss and total power loss vs flux density these are the basic constraints in transformer design. Core loss: Flux density: Copper loss: Total power loss vs flux density:
Description : What is belt? Explain operation of belt. List different types of belt and give one example of each.
Answer : Definition:- A belt is a loop of flexible material used to mechanically link two or more rotating shafts, most often parallel. Belts may be used as a source of motion, to transmit power ... conveyor belt is one application where the belt is adapted to continuously carry a load between two points.
Description : What are the different types of aggregates ?
Answer : Aggregate are divided into two categories: 1. Coarse Aggregate: The size of aggregate bigger than 4.75mm is considered as Coarse Aggregate. a) Crushed stone particles. b) Brick bats c) Slag 2. Fine ... Aggregate. a) River sand. b) Sea sand. c) Pit sand d) Artificial crushed stone sand.
Description : What are the types of machine translation?
Answer : i. Rough translation ii. Restricted source translation iii. Pre edited translation iv. Literacy translation
Description : What are the types of information extraction systems?
Answer : i. Attribute based system ii. Relational based system
Description : What are the types of clustering technique?
Answer : i. Agglomerative clustering ii. K-means clustering
Description : What are the types of evaluation of IR systems?
Answer : i. Recall ii. Precision
Description : What are the types of smoothing?
Answer : i. Add one smoothing. ii. Linear Interpolation Smoothing
Description : What are the types of Ambiguity?
Answer : i. Lexical Ambiguity ii. Syntactic Ambiguity iii. Semantic Ambiguity
Description : What are the types of parsing?
Answer : i. Top down parsing ii. Bottom up parsing
Description : What are the different types of induction heuristics?
Answer : There are two different types of induction heuristics. They are: i. Require-link heuristics. ii. Forbid-link heuristics.
Description : What are the different types of planning?
Answer : The different types of planning are as follows: i. Situation space planning. ii. Progressive planning. iii. Regressive planning. iv. Partial order planning. v. Fully instantiated planning.
Description : What are the types of machine learning?
Answer : i. Supervised Learning ii. Unsupervised Learning iii. Reinforcement Learning
Description : What are the 2 types of processes?
Answer : i. Discrete events – it have definite structure ii. Liquid events - Categories of events with process.
Description : What are the 2 types of frame problem?
Answer : i. Representational Frame Problem ii. Inferential Frame Problem
Description : What are the 2 types of synchronic rules?
Answer : i. Diagnostic rules ii. Casual rules.
Description : What are the 3 types of symbol which is used to indicate objects, relations and functions?
Answer : i) Constant symbols for objects ii) Predicate symbols for relations iii) Function symbols for functions
Description : What are the types of constraints?
Answer : There are 5 types, a. Unary constraints relates one variable. b. A binary constraint relates two variables. c. Higher order constraints relate more than two variables. d. Absolute constraints. e. Preference constraints.
Description : What are the 2 types of memory bounded heuristic algorithms?
Answer : i. Recursive Best First Search(RBFS) ii. Memory bounded A*(MA*)