method for improving string efficiency
Last Answer : The Methods of Improving String Efficiency:- 1) By reducing value of ‘m’ or (‘k’) by using longer cross arm. 2) By Making of ‘m’ or (‘k’) equal to zero 3) By grading Insulator. 4) By Using guard ring.
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110 views
1 answer
asked
Aug 25, 2019
by
anonymous

Give the classification of the errors used in measuring instrument & state the reason for their occurrence.
Last Answer : Types of errors in measuring instruments: A) Gross error: These are due to mistakes on the part of person using the instrument. B) Systematic Error: i) Instrumental Error: These ... multiplying factor. C) Random error: These persist even after gross and systematic errors are removed.
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124 views
1 answer
asked
Sep 6, 2018
by
anonymous

Do you have any string?
Last Answer : There is string in out garage. And it’s string, not twine. I’ve used it to tie a stuffed pork tenderloin. I also have yarn, which is like furry string.
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0 views
1 answer
asked
Feb 27
by
anonymous

How To Make A String Can Telephone
Last Answer : Materials: 2 tin cans with one hole punched in bottom string Instructions: 1) Prior to the meeting, punch a hole in the bottom of each tin can using a nail and a hammer. 2) Thread string through hole in bottom of can and knot. 3) Pull string taut to ‘talk’ over the telephone.
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3 views
1 answer

How to String a Tennis Racquet
Last Answer : How to String a Tennis Racquet If you're a professional tennis player, your racquet is your best friend. It'll need proper care, and one important maintenance task you need to do for it is ... forget to do this maintenance tactic, otherwise you'll find yourself with a faulty racquet in the court!
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6 views
1 answer

The number of insulator discs (each rated 11 kV) required in a suspension type insulator string of 220 kV line is
Last Answer : The number of insulator discs (each rated 11kV) required in a suspension type insulator string of 220 kV line is 16
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368 views
1 answer
asked
May 8, 2018
by
anonymous

Write a short note on Measuring Flask
Last Answer : Measuring Flask : Flask is laboratory vessels (container). The flask is made of plastic or glass. They are of different sizes and shapes. In school laboratory, 50ml, 100ml, 250ml, 500ml & 1000ml ... of different sizes and shapes. In laboratory 10ml to 25 ml pipette of glass or plastic are used.
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6 views
1 answer

What are the test and measuring instrument required in an Electrical depots?
Last Answer : Ans. Following are the test and measuring instruments required in an Electrical depots. a. Test lamp b. Line Tester c. Continuity tester d. Volt meter e. Ammeter f. Earth megger g. Megger h. Lux meter i. Power analyzer j. Infrared thermometer
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13 views
1 answer

Electrical Measuring Instruments
Last Answer : Electrical Measuring Instruments
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111 views
2 answers
asked
Apr 8, 2020
by
anonymous

calibration and the need of calibration for measuring instruments.
Last Answer : Calibration - It is a process of estimating the value of a quantity by comparing that quantity with a standard quantity. Need of calibration: - Calibration defines the accuracy and ... aim of calibration is to minimize any measurement uncertainty by ensuring the accuracy of test equipment.
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119 views
1 answer
asked
Aug 21, 2019
by
anonymous

Explain the essential toques in analog type measuring instruments.
Last 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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404 views
1 answer
asked
Sep 6, 2018
by
anonymous

State two purposes of calibration of measuring instruments.
Last Answer : Purposes of calibration of measuring instruments: - The purpose of calibration is to ensure that readings of an instrument are consistent with other instruments. It is also important in determining the ... will need to be calibrated periodically to make sure it can function properly and safely.
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109 views
1 answer
asked
Sep 6, 2018
by
anonymous

List three types of errors in measuring instruments. Give reasons of occurring for any one of them.
Last Answer : Types of errors in measuring instruments: A) Gross error: These are due to mistakes on the part of person using the instrument. B) Systematic Error: i) Instrumental Error: These ... multiplying factor. C) Random error: These persist even after gross and systematic errors are removed.
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142 views
1 answer
asked
Sep 6, 2018
by
anonymous

Define following terms related to measuring instruments: i) Sensitivity ii) Selectivity.
Last Answer : i) Sensitivity: It is the ratio of the change in output signal to the change in input signal of quantity being measured. ii) Selectivity: It is the term to describe fulfillment of the requirements of measurement by an instrument to be suitable for use in a given situation.
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188 views
1 answer
asked
Sep 6, 2018
by
anonymous

Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.
Last Answer : A)Spring control method: As shown in the figure, the inner ends of the both springs are attahced to the spindle, while outer end of upper spring is attached to the lever and outer ... of spring material: 1.Non Magnetic material 2.Low specific resistance 3.Low temperature coefficient of resistance
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818 views
1 answer
asked
Sep 6, 2018
by
anonymous

Name the different torque and their function in measuring instrument.
Last Answer : List of torques in analog instruments: 1. Deflecting torque 2. Controlling / restraining torque. 3. Damping torque. 1. Deflecting torque: - To create deflection of pointer ... . - Bring the pointer to standstill quickly. - To minimize oscillations about final position.
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454 views
1 answer
asked
Sep 6, 2018
by
anonymous

List out any four effects of electric current used in measuring instruments & write name of meter working on it.
Last Answer : Effects of Electric Current used in measuring instruments: 1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc. 2. Electromagnetic induction ... . Electrostatic effect: Voltmeters. 5. Hall Effect: Flux meter, Poynting vector wattmeter.
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997 views
1 answer
asked
Sep 6, 2018
by
anonymous

What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.
Last Answer : 1. Error due to stray magnetic fields- Main magnetic field gets disturbed by external magnetic fields known as stray magnetic fields. 2. Compensation technique To avoid this error, ... resistance alloy having a negligible resistance temp coefficient in the ratio of 1:10 for pressure coil
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170 views
1 answer
asked
Sep 6, 2018
by
anonymous

Explain magnetic effect employed in measuring instrument.
Last Answer : Magnetic Effect: I) In PMMC meters: ➢ When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current ... field it experiences a mechanical force. Examples: Electrodynamometer type instruments, Induction type instrument.
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194 views
1 answer
asked
Sep 6, 2018
by
anonymous

Describe systematic errors in measuring instruments.
Last Answer : Systematic errors: - ➢ Instrumental Error: These errors are caused due to the mechanical structure of measuring instrument. a) Inherent shortcomings of instruments: Instrument may read ... or electrostatic fields. ➢ Observational Error: Parallax errors, incorrect multiplying factor.
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85 views
1 answer
asked
Sep 6, 2018
by
anonymous

State the function of controlling torque in electrical measuring instrument.
Last Answer : Function of controlling torque 1. The function is to opposes the deflection force and increases with the increase in the deflection of the moving system, to limit its movement. 2. and brought ... set a position where the two opposing forces i.e. deflection and controlling forces are equal.
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217 views
1 answer
asked
Sep 6, 2018
by
anonymous

Define: (i) Resolution, (ii) Calibration, with reference to electrical measuring systems.
Last Answer : Resolution The smallest increment in input (the quantity being measured) which can be detected with certainty by an instrument is called its resolution or discrimination. OR It is ... the measuring instrument with standard instrument to find out the error in the instrument under test.
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87 views
1 answer
asked
Sep 6, 2018
by
anonymous

Why energy meter is integrating type measuring instrument?
Last 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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128 views
1 answer
asked
Sep 5, 2018
by
anonymous

List any four effects employed in measuring instruments.
Last Answer : Effects Employed in Measuring Instruments: 1. Magnetic Effect 2. Electromagnetic induction 3. Heating effect 4. Electrostatic effect 5. Hall Effect
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137 views
1 answer
asked
Sep 5, 2018
by
anonymous

When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because (A) Cables have a low value of capacitance which draws a high ... high value of charging current (D) Cables have a low value of capacitance and initial resistance
Last Answer : When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because Cables have a high value of capacitance which draws a high value of charging current
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852 views
1 answer
asked
Apr 28, 2018
by
anonymous

Last Answer : The desirable static characteristics of a measuring system are accuracy, sensitivity and reproducibility.
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931 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : For measuring a very high resistance we should use Meggar.
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134 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : For measuring current at high frequency we should use thermocouple instrument.
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146 views
1 answer
asked
Mar 21, 2018
by
anonymous

SEER: Seasonal Energy Efficiency Ratio (SEER)
Last Answer : SEER: Seasonal Energy Efficiency Ratio (SEER), is most commonly used to measure the efficiency of a central air conditioner. The higher the SEER, the more efficient the system OR It is the ... the ratio of total capacity to the total KW energy usage at specific humidity and temperature condition.
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26 views
1 answer
asked
Jan 2, 2021
by
anonymous

State why a transformer always have an efficiency of more than 90%.
Last Answer : As transformer is static device with no moving parts, the losses due to friction & windage are completely absent. Hence transformer has efficiency of more than 90%.
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273 views
1 answer
asked
May 22, 2020
by
anonymous

Compare the salient features of LED and CFL based on: i] Lamp Efficiency ii] Life span
Last Answer : Parameter LED CFL Lamp Efficiency High (more than 70 lumen per watt) Comparatively less (50-60 lumen per watt) Life span (in working hours) 10000 3000
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96 views
1 answer
asked
May 3, 2020
by
anonymous

Define PIV, TUF, ripple factor, efficiency of rectifier.
Last Answer : PIV: Peak Inverse Voltage (PIV) is defined as the maximum negative voltage which appears across non-conducting reverse biased diode. TUF : Transformer Utilization Factor (TUF) is defined as the ratio of DC output ... Efficiency of rectifier: η = DC output power/ AC input power = PLdc / Pac
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803 views
2 answers
asked
May 2, 2020
by
anonymous

"Efficiency of thermal power station is low". — Justify.
Last Answer : Justification: Efficiency of thermal power station is low":- Overall efficiency of T.P.P depends upon efficiency of boiler, turbine and alternator. The heat produced due to combustion of coal ... losses in thermal power plant is 71%, So efficiency of thermal power plant is less about 29%
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105 views
1 answer
asked
Aug 2, 2019
by
anonymous

Transformer efficiency
Last Answer : Transformer efficiency
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77 views
1 answer
asked
Jun 11, 2019
by
anonymous

What is the efficiency of Class-B amplifier? A) 68.50% B) 78.50% C) 88.50% D) 98.50%
Last Answer : What is the efficiency of Class-B amplifier? A) 68.50% B) 78.50% C) 88.50% D) 98.50%
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94 views
1 answer
asked
Jun 18, 2018
by
anonymous

The overall efficiency of Thermal Power Plant is equal to _______________ . (A) Regenerative Cycle Efficiency (B) Renkine Cycle Efficiency (C) Carnot cycle efficiency (D) None of the above
Last Answer : The overall efficiency of Thermal Power Plant is equal to Regenerative Cycle Efficiency.
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446 views
1 answer
asked
May 8, 2018
by
anonymous

A transformer operates 24 hours day at full -load. It's full -load efficiency is : (A) equal all day efficiency (B) more than all -day efficiency (C) less than all -day efficiency (D) equal to maximum efficiency
Last Answer : A transformer operates 24 hours day at full -load. It's full -load efficiency is : equal all day efficiency
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264 views
1 answer
asked
Apr 30, 2018
by
anonymous

The rankine cycle efficiency of steam power plant is (1) 60-80% (3) 30-45% (2) 45-80% (4) 20-30%
Last Answer : The rankine cycle efficiency of steam power plant is 30-45%
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111 views
1 answer
asked
Apr 29, 2018
by
anonymous

Transmission efficiency of a transmission line increases with the
Last Answer : Transmission efficiency of a transmission line increases with the increase in power factor and voltage
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88 views
1 answer
asked
Apr 26, 2018
by
anonymous

For high efficiency of transfer of power, internal resistance of the source should be?
Last Answer : For high efficiency of transfer of power, internal resistance of the source should be less than the load resistance.
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638 views
1 answer
asked
Mar 25, 2018
by
anonymous

Last Answer : The efficiency of diesel locomotives is nearly 20 to 25 percent.
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80 views
1 answer
asked
Mar 22, 2018
by
anonymous

Last Answer : The overall efficiency of steam locomotive is around 5 to 10 percent.
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96 views
1 answer
asked
Mar 22, 2018
by
anonymous

Last Answer : D.C. generators are normally designed for maximum efficiency around full-load.
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102 views
1 answer
asked
Mar 20, 2018
by
anonymous
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Last Answer : The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.
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237 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The range of efficiency for shaded pole motors is 5% to 35%.
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120 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The efficiency of a properly designed synchronous motor will usually fall in range 85 to 95%.
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73 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.
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139 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The efficiency of a power transformer is of the order of 98 percent.
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99 views
1 answer
asked
Mar 19, 2018
by
anonymous

Last Answer : An ideal transformer will have maximum efficiency at a load such that copper loss equal to iron loss.
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204 views
1 answer
asked
Mar 19, 2018
by
anonymous

For a transformer, operating at constant load current, maximum efficiency will occur at?
Last Answer : For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.
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124 views
1 answer
asked
Mar 19, 2018
by
anonymous
