Which type of heater is cheapest to run?

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Description : Which heater to choose?

Answer : Battery life and the quality of utilities are not at their best in all homes. It is especially difficult for residents of corner apartments or upper floors - very little heat reaches them, so ... of a heat fan, the essential difference of which is the possibility of long-term continuous operation.

Answer : A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to r.m.s. voltage.

Description : State the function of super heater of a thermal power plant. 

Answer : Function of Super heater: -  Its function is to increase the temperature of steam by absorbing heat from exhausted hot flue gases.

Description : State the location and function of i) Economizer ii) Feed water heater.

Answer : (i) Economizer:-  Location: - It is placed in the path of flue gases in between the exit from the furnace and the chimney. OR In The way of feed water before boiler. Function: - ... economizer. Function: - Its function is to increase the temperature of feed water by using blade steam.

Description : When current flows through heater coil it glows but supply wiring does not glow because?

Answer : When current flows through heater coil it glows but supply wiring does not glow because resistance of heater coil is more than the supply wires.

Description : A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will?

Answer : A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will increase.

Description : Instant 100 meters (How fast to run 100 meters?)

Answer : Instant 100 meters (How fast to run 100 meters?) This guide outlines the step-by-step preparation for the most efficient 100-meter run. 0-15 meters With your head down, you need to ... length. Constant training and the right technique will allow you to improve your 100 meter running results.

Answer : In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.

Answer : In a ceiling fan employing capacitor run motor secondary winding surrounds the primary winding.

Answer : The repulsion-start induction-run motor is used because of high starting torque.

Answer : A universal motor can run on either A.C. or D.C.

Answer : A schrage motor can run on zero slip, negative slip, positive slip.

Answer : A rotory converter can also be run as a synchronous motor.

Description : Which type of motor is used in lift?

Answer : Synchronous motor

Description : An induction type energy meter is found to run fast. Correction for this error can be made by  (A) Over-load compensation. (B) Voltage compensation. (C) Moving the brake magnet away from the centre of the disc. (D) Moving the brake magnet towards the centre of the disc.

Answer : An induction type energy meter is found to run fast. Correction for this error can be made by Moving the brake magnet away from the centre of the disc.

Description : A thyrite type lightening arrester :

Answer : A thyrite type lightning arrester : offers low resistance path to surge currents

Description : Which type of starter is used to start the DC motor?

Answer :  Sandwich type winding is used in 3 phase shell-type transformer.

Description : Which is the most common type of fault?

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

Description : Transformer coupling introduces which type of distortion?

Answer : Transformer coupling introduces Cross over distortion.

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. 

Description : A piezo-electric type pressure sensor has a sensitivity of 1 mV/kPa and a bandwidth of 300 Hz to 300 kHz. For a constant (dc) pressure of 100 kPa, the steady state output of the sensor in millivolt is (A) 0 (B) 2 (C) 4 (D) 6

Answer : A piezo-electric type pressure sensor has a sensitivity of 1 mV/kPa and a bandwidth of 300 Hz to 300 kHz. For a constant (dc) pressure of 100 kPa, the steady state output of the sensor in millivolt is 0

Description : What type of meter is used to measure current?

Answer : Ammeter

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. 

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 

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 

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. 

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

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

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: 

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

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.

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

Answer : Buy from amazon: Buy:

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.

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.

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.

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. 

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. 

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. 

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.

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. 

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.

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. 

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

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.

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.

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. 

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.

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. 

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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