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For measuring current at high frequency we should use thermocouple instrument.

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Answer :

For measuring a very high resistance we should use Meggar.

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Description :

In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

Answer :

In a series RLC high Q circuit, the current peaks at a frequency equal to the resonant frequency

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304 views 1 answer
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Answer :

For measurement of inductance having high value, we should use Hay's bridge.

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136 views 1 answer
Description :

Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

Answer :

Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO 

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86 views 1 answer
Description :

Which capacitor is used for high frequency?

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Description :

Answer :

MOSFET provides better efficiency at high frequency and its high speed switching losses are less hence MOSFET is used for high frequency.

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101 views 1 answer
Description :

List out any four effects of electric current used in measuring instruments & write name of meter working on it.

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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581 views 1 answer
Description :

Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Answer :

Step-down transformer converts high voltage and low current into: Low voltage and high current

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88 views 1 answer
Description :

Why does induction motor have high starting current?

Answer :

In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor

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122 views 2 answers
Description :

In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

Answer :

In a series R-C circuit, with the increase in frequency, current Increases

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Description :

The frequency of an alternating current is?

Answer :

The frequency of an alternating current is the number of waves passing through a point in one second.

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Description :

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 value of charging current (B) Cables have a low value of initial resistance (C) Cables have a high value of capacitance which draws a high value of charging current (D) Cables have a low value of capacitance and initial resistance

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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631 views 1 answer
Description :

Wire-wound resistors are unsuitable for use at high frequencies because they?

Answer :

Wire-wound resistors are unsuitable for use at high frequencies because they exhibit unwanted inductive and capacitive effects.

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130 views 1 answer
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Answer :

The desirable static characteristics of a measuring system are accuracy, sensitivity and reproducibility.

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429 views 1 answer
Description :

Answer :

Yes MOSFET can operate at very high frequency.

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85 views 1 answer
Description :

For high efficiency of transfer of power, internal resistance of the source should be?

Answer :

For high efficiency of transfer of power, internal resistance of the source should be less than the load resistance.

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367 views 1 answer
Description :

Two waves have frequency of 500 Hz. One is set at its maximum value whereas the other at zero. The phase angle between them will be

Answer :

Two waves have frequency of 500 Hz. One is set at its maximum value whereas the other at zero. The phase angle between them will be 90o

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213 views 1 answer
Description :

Which rotor is use for high speed in turbo alternators?

Answer :

Non-salient pole rotor is used for high speed in turbo alternators.

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Answer :

For measurements on high voltage capacitors, the suitable bridge is Schering bridge.

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260 views 1 answer
Description :

calibration and the need of calibration for measuring instruments.

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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75 views 1 answer
Description :

List three types of errors in measuring instruments. Give reasons of occurring for any one of them.

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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83 views 1 answer
Description :

Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.

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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609 views 1 answer
Description :

Give the classification of the errors used in measuring instrument & state the reason for their occurrence.

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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82 views 1 answer
Description :

Answer :

String efficiency is used for measuring the degree of utilization of SCR.

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Description :

For measurement of radio frequency ac signals __________ type meter is used

Answer :

For measurement of radio frequency ac signals thermo-couple type meter is used

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131 views 1 answer
Description :

Why do we use AC current in our homes?

Answer :

We used it for cooking rice,  For washing clothes and for lights in the house.

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Description :

Answer :

The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

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218 views 1 answer
Description :

State the advantages of use of high voltage in transmission of Electric power. 

Answer :

Advantages: 1. As Transmission voltage increases, current decreases. 2. As current decreases, cross section of conductor decreases. 3. As cross section of conductor decreases, its ... high voltage transmission line, successful interconnection of transmission line is possible than low voltage. 

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32 views 1 answer
Description :

Answer :

Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of D.C. series motor.

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95 views 1 answer
Description :

The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs

Answer :

The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs

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554 views 1 answer
Description :

Electrical Measuring Instruments

Answer :

Electrical Measuring Instruments

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88 views 2 answers
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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245 views 1 answer
Description :

State two purposes of calibration of measuring instruments.

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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48 views 1 answer
Description :

Define following terms related to measuring instruments: i) Sensitivity ii) Selectivity.

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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97 views 1 answer
Description :

Name the different torque and their function in measuring instrument.

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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66 views 1 answer
Description :

What arc the errors occurring in measuring devices due to stray magnetic field and temp '? Explain how to compensate them.

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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69 views 1 answer
Description :

Explain magnetic effect employed in measuring instrument.

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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81 views 1 answer
Description :

Describe systematic errors in measuring instruments. 

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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59 views 1 answer
Description :

State the function of controlling torque in electrical measuring instrument.

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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79 views 1 answer
Description :

Define: (i) Resolution, (ii) Calibration, with reference to electrical measuring systems.

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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54 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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73 views 1 answer
Description :

List any four effects employed in measuring instruments.

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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Description :

Answer :

A Weston frequency meter is moving iron instrument.

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Description :

Answer :

In a Weston frequency meter, the magnetic axes of the two fixed coils are perpendicular.

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Description :

Answer :

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of 0.5 Hz.

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191 views 1 answer
Description :

Answer :

For measuring emf of a standard cell we use: Potentiometer

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Description :

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

Answer :

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

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Description :

At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because (A) Of drive in diffusion of dopants & carriers. (B) Band to band transition dominates impurity ionization. (C) Impurity ionization dominates band to band transition. (D) Band to band transition is balanced by impurity ionisation.

Answer :

At very high temperatures, extrinsic semiconductor becomes intrinsic semiconductor because Impurity ionization dominates band to band transition.

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Description :

Answer :

An induction motor has relatively high power factor at near full load.

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Description :

Why is it cheaper to transmit electrical energy at high voltage?

Answer :

Because of the electrical energy was step upped by transformers the transformer have high efficiency than the electric energy is cheaper

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124 views 1 answer
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