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Overload relays are of induction, solid state, thermal, electromagnetic type.

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Answer :

Thermal overload relays are used to protect the motor against overcurrent due to heavy loads.

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Description :

A relay used for protection of motors against overload is :  (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay

Answer :

A relay used for protection of motors against overload is : Thermal relay

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294 views 1 answer
Description :

IDMT relays are used to protect the transformer against :  (A) Internal short -circuits (B) Open circuits (C) External short circuits (D) Oil leakage

Answer :

IDMT relays are used to protect the transformer against : External short circuits

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Description :

Answer :

The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.

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Description :

Answer :

The single phasing relays are used for the protection of three phase motors.

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Description :

Answer :

Impedance relays are used for phase faults on long line.

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Description :

Answer :

Discrimination between main and back up protection is provided by the use of relays which are slow.

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322 views 1 answer
Description :

Answer :

To protect most of the electrical equipment handling low power, the types of relays used are thermocouple, electronic and bimetallic.

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Description :

Answer :

Protective relays are devices that detect abnormal conditions in electrical circuits by measuring constantly the electrical quantities which differ during normal and abnormal conditions.

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Description :

Answer :

Directional relays are based on flow of power.

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Description :

D.C. shunt relays are made of?

Answer :

D.C. shunt relays are made of many turns of thin wire.

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Description :

Answer :

Relays can be designed to respond to changes in resistance, reactance or impedance voltage and current, light intensity, temperature.

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Description :

State the function of overload coil and No volt coil in dc motor starter.

Answer :

Function of Overload Coil: When DC motor is overloaded, the overload coil carries the overload current and produces strong magnetic field to attract a plunger, which short the terminals of ... dc motor is prevented from restarting automatically on recovery of supply without starter and protected.

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Description :

Answer :

Overload capacity of diesel engines is usually restricted to 2 percent.

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Description :

How many types of types of relays are there?

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Description :

Consider the following statements. Which of these statements are correct ?  (1) Reactance relays are preferred for ground fault relaying  (2) Impedance relays are most suitable for:protecting long transmission lines  (3) Mho relays are best suited for long transmission line protection  (4) Reactance relays are widely used for protection of Medium transmission lines  (A) All of them (B) (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)

Answer :

Consider the following statements. Which of these statements are correct ?  (1) Reactance relays are preferred for ground fault relaying  (2) Impedance relays are most suitable for:protecting long transmission lines  (3) Mho relays are ... (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)

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Description :

In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

Answer :

In the induction type directional over current relay, when a short-circuit occurs in the circuit power flows in reverse direction

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Description :

Answer :

The torque produced in induction type relay (shaded pole structure) is inversely proportional to the square of the current.

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Description :

Which is the most common type of fault?

Answer :

Single phase to ground fault is the most common type of fault.

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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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71 views 1 answer
Description :

 For the protection of parallel feeders fed from one end, the relays used are: A) non-directional relays at the source-end and directional relays at the load-end B) non-directional relays at both the ends C) directional relays at the source-end and non-directional at the load-end D) directional relays at both the ends

Answer :

For the protection of parallel feeders fed from one end, the relays used are: non-directional relays at the source-end and directional relays at the load-end

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293 views 1 answer
Description :

Reactance relays are employed for Phase faults in : (A) Short lines (B) Medium lines (C) Long lines (D) Any line

Answer :

Reactance relays are employed for Phase faults in : Short lines

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108 views 1 answer
Description :

Explain working of a storage type water cooler with a sketch. 

Answer :

The storage type cooler has the evaporator coil soldered on to the walls of the storage tank of the cooler, generally on to the outside surface of the walls. The tank could be of the ... outside at a lower level, much below the lower most evaporator refrigerant tube soildered on to the tank. 

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Description :

State two applications of : (i) PVC paper (ii) Porcelain with type of class based on withstand temperature is insulating material. 

Answer :

 (i) Application of PVC paper : 1. It is used in slot lining or motor winding insulation purpose 2. For Insulation of Transformer winding (ii) Application of Porcelain : 1. Mainly used for manufacturing ... on withstand temperature : * H' & C' Class of insulation i e. 180° and above 180°C 

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126 views 1 answer
Description :

State the type of insulating materials under Class Y and Class B.

Answer :

The type of insulating materials under Class Y : 1. Cotton  2. Silk 3. Paper 4. Rubber 5. PVC The type of insulating materials under Class B: 1. Backelite 2. Impregnated varnish 3. Mica 4. Fiber glass 5. Asbestos 

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Description :

State advantages of rotating field type alternators. 

Answer :

Advantages of Rotating Field Type Alternator: 1) For high-voltage alternator, large space is required to accommodate conductors with insulation, as high voltage is induced in them. If field poles are placed ... is kept rotating. 8) Rotating field is comparatively light and can run with high speed. 

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69 views 1 answer
Description :

Compare Dual slope DVM and SAR type DVM.

Answer :

Sr no Dual slope DVM SAR type DVM 1 It is highly accurate It is moderately accurate 2 Cost is high It is inexpensive 3 Two comparator is used One comparator is used ... resolution Good resolution 5 Slow speed High speed 6 Less Error More error

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2.3k views 1 answer
Description :

operation of ramp type DVM.

Answer :

This is given to an input comparator which will compare two signals and generates the output. One input to the input comparator is from the input and another input is from the ramp. This input voltage and ... ground and output is given. This output will stop the flow of purchase from clock

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168 views 1 answer
Description :

operating principle of condenser type microphone with neat diagram.

Answer :

Principle: When sound pressure moves the diapharam in, the capacitance increases, and when it moves out, the capacitance decreases. The change in capacitance results in change in out put voltage of microphone. ... in volts.  Q= charge in coulombs  C= capacitance in farad Diagram: 

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Description :

Describe the working principle of photoelectric pickup type tacho-generator.

Answer :

Working: Working principle: The light passes through the holes available on the rotating disc with a specific interval, depends on the angular speed of disc having equidistant holes. The frequency of this light pulses ... by N=f/HS  N=speed  f=frequency  Hs=holes on the disc

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338 views 1 answer
Description :

State the use of RADAR type level transducer & list two advantages.

Answer :

Applications of radar type transducer: i) RADAR type level transducer is suitable for large tanks with range upto 200m for level measurement. ii) It is used for continuous level measurement. ... iii) Not affected by corrosive materials. iv) Can be used for hard to handle' applications.

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62 views 1 answer
Description :

Blackt Electrotech 230V 24x7 Energy Saving Socket Type Digital Programmable Plastic Electronic Timer (White)

Answer :

Buy from amazon: https://amzn.to/2SUTSdv Buy: http://bit.ly/2ZqlAkS

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68 views 1 answer
Description :

State any four characteristics of core type transformer.

Answer :

Characteristics of core type transformer: i) It has one window. ii) It has one magnetic circuit. iii) Core surrounds the winding. iv) Average length of core is more. v) Area of cross ... Better cooling for winding. vii) Mechnical strength is comparatively less. viii) Repair and maintenance is easy.

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83 views 1 answer
Description :

With diagram explain bottoming cycle type of co-generation.

Answer :

Bottoming cycle type of co-generation: i) Bottoming cycle of co-generation system is that in which high temperature heat energy is produced using primary fuels. ii) This heat produced is ... of the system greatly. vii) Bottoming cycles are suitable for cement industries, ceramic factories etc.

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101 views 1 answer
Description :

Describe principle of operation of Doppler type ultrasonic flow meter with diagram. 

Answer :

Diagram: Working:  The flow meter consists of a crystal transducer mounted outside the pipe in which flow is to be measured. This transducer is a piezoelectric crystal which ... , so the frequency of the reflected wave is shifted to particle velocity, according to Doppler principle.

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112 views 1 answer
Description :

Draw the diagram and explain the working of ferrodynamic type frequency meter. 

Answer :

Ferrodynamic type frequency meter: (Electrical resonance type frequency meter): It consists of a fixed coil. The supply whose frequency is to be measured is connected across it. This coil ... so selected that the moving coil takes up a convenient position when frequency is of normal value. 

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5.8k views 1 answer
Description :

Explain the essential toques in analog type measuring instruments.

Answer :

List of torques in analog instruments:  1. Deflecting torque  2. Controlling / Restraining torque.  3. Damping torque.  1. Deflecting torque: To create deflection proportional to ... the speed higher will be the damping torque bringing the pointer to the equilibrium position quickly. 

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253 views 1 answer
Description :

State the function and shape of following parts used in induction type energy meter: i) Series magnet ii) Shunt magnet iii) Al disc iv) Brake magnet

Answer :

i) Series magnet: produce flux proportional to current (load current) of circuit and interact in the aluminum disc with flux produced by voltage magnet for torque production. Its shape is like letter U.  ii) ... : brakes the motion of the aluminum disc or slows it down. Its shape is like letter C. 

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90 views 1 answer
Description :

With neat sketch explain working of Weston type synchroscope.

Answer :

Weston type synchroscope:  Working: It consists of three limbed transformer. The winding on one of the outer limbs is excited from bus- bars and that on other limb by incoming machine. The two fluxes ... the lamp is flickering at a very much slow rate and it is at its maximum brightness.

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682 views 1 answer
Description :

State the effects of errors in dynamometer type wattmeter due to i) pc- inductance ii) pc- capacitance iii) mutual inductance iv) Connection.

Answer :

Errors in wattmeter:  i) pc - inductance: Pressure coil inductance causes wattmeter to read more power than actual .  ii) pc-capacitance: The wattmeter reads less power.  iii) ... iv) Connection: In uncompensated wattmeter , the reading of wattmeter includes the powerloss in coils. 

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98 views 1 answer
Description :

With a neat sketch explain working of 1 phase dynamometer type power factor meter.

Answer :

Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals ... becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load. 

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112 views 1 answer
Description :

Draw a neat sketch of 1-ph induction type energy meter and write operating principle of it. 

Answer :

Operating Principal:- The disc is placed between the two-flux due to pressure coil and flux due to current coil, which will set up torque on the disc which is proportional to power causing the ... is proportional to voltage, the second carries a current coil so its flux is proportional to current.

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95 views 1 answer
Description :

With neat diagram explain constructional details of dynamometer type wattmeter.

Answer :

Working Principle of Wattmeter: It consists of two stationary coils, called current coils and one moving coil, called voltage or potential coil. The moving coil is mounted on the spindle, in the gap ... experiences a force and tends to move in the direction as per Fleming's left hand rule. 

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199 views 3 answers
Description :

Explain construction & working of attraction type M.I. instrument with neat diagram.

Answer :

1. Moving element: a small piece of soft iron in the form of a vane or rod.  2. In Attracted type a cylindrical coil or solenoid which is kept fixed. An oval-shaped soft-iron piece are ...   9. When = the pointer will be stable & we can get correct reading of the electrical quantity

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3.2k views 2 answers
Description :

Explain working of Weston type frequency meter.

Answer :

Weston Type Frequency Meter: There are two fixed coils marked as A and B. Each coil divided into two equal parts and are fixed such that their magnetic axis are perpendicular to each ... leading to deflections in either direction depending on the currents there in, due to changed impedances.

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3.3k views 2 answers
Description :

Explain construction & working of electrodynamometer type wattmeter.

Answer :

Electrodynamometer Type Wattmeter:  Construction: It essentially consists of the fixed and moving coil. The fixed coil is split into two equal parts which are placed close together and parallel to each other. ... hence these instruments can be used for measurement of A.C. & D.C. power.

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773 views 1 answer
Description :

Why energy meter is integrating type measuring instrument?

Answer :

Energy Meter is Integrating Type Measuring Instrument: Energy meter is used for measurement of energy, which is obtained by integration (summation) of power supplied over the particular time duration, hence it the integrating type measuring instrument. 

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75 views 1 answer
Description :

Write any two advantages of MI type instrument.

Answer :

Advantages of MI Type Instrument: 1. These are robust in construction. 2. Used for both A.C. as well as D.C. measurements. 3. These are economical. 4. These possess high operating torque 5. These are simple in construction hence can be easily handled.

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65 views 1 answer
Description :

List any four errors in induction type energy meter. Give method of compensation for each.

Answer :

Errors in Induction Type Energy Meter with their Compensation:  1) Error due to friction: This error can be compensated by the additional shading band provided on the shunt electromagnet.  2) Phase ... error: This error can be compensated by providing a flux diverter' to the current magnet. 

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1.1k views 1 answer
Description :

Describe the operation of N channel enhancement type MOSFET with diagram.

Answer :

As its name indicates, this MOSFET operates only in the enhancement mode and has no depletion mode. It operates with large positive gate voltage only. It does not conduct when the ... of charge carriers attracted to the positive gate. Thus drain current is controlled by the gate potential.

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234 views 1 answer
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