Note: All those students having less than 15 marks in MID-1 must meet subject teachers and take proper guidance for MID-II. All these students must sign on a attendance sheet during this meeting with subject teachers, Failing which subject teachers may contact respective parents for this.
| Question Bank (EEMI, 3RD SEM) | |
| Subject Code: | 2130903 |
| Question No. | Question |
| Chapter 1: Phylosophy of measurement | |
| 1 | List the static charecteristics of an instrument. |
| 2 | Classify meters according to principle of operation. |
| 3 | State the advantages of digital instruments over analog instruments. |
| 4 | Explain following terms with reference to instrument (1) Accuracy (2) Precision (3) drift (4) repeatability (5) sensitivity (6) Linearity (7) Hysteresis |
| 5 | State the various types of errors in an instrument. What do you mean by calibration of an instrument? |
| 6 | Explain following terms with reference to instrument (1) Re producibility (2) dead zone (3) Resolution (4) stability |
| 7 | What are the dynamic errors in an instruments |
| 8 | What do you mean by standards in measurement ? Explain the types of standards. |
| Chapter 2: Analog measurement of Electrical quantities | |
| 9 | Classify the instruments based on their function. |
| 10 | Write the principle of moving coil instruments. Also state its advantages and disadvantages. |
| 11 | Explain briefly about PMMC and PMMI instruments with Torque equation. |
| 12 | A moving coil instrument whose resistance is 25 Ω gives full scale deflection with a current of 1 mA. This instrument is used with a manganin shunt to extend its range to 100 mA. Calculate the error caused by a 100 C rise in a Temperature when: (1) copper moving coil is directly connected across manganin shunt (2) A 75 Ω manganin resistance is used in series with the instrument moving coil. Temperature co-efficient of copper is 0.0004 /0C and that of manganin is 0.00015/ 0C . |
| 13 | A moving coil instrument gives full scale deflection of 10 mA when a potential difference across its terminal is 100 mV. Calculate (1) the shunt resistance for full scale deflection of 100 A. (2) series residtance for full scale reading with 1000 V. |
| 14 | Derive the torque equation of Dynamometer type instrument for D.C and A.C current measurements. |
| 15 | For a certain dynamometer type ammeter mutual inductance M varies with deflection in degrees as M= -6 cos (Ѳ+ 300) mH. Find the deflection torque produced by a direct current of 50 mA corresponding to a deflection of 600. |
| 16 | Draw the different circuit diagrams for current and voltage measurement in Dynamometer type instruments. |
| 17 | List out the various sources of errors in Electrodynamometer type wattmeters. |
| 18 | Two wattmeters are connected to measure input to a balanced three phase circuit indicate 2000 W and 500 W respectively. Find power factor of circuit when (1) both the readings are same (2) when later reading is obtained after reversing the connections to the current coil of first instrument. |
| 19 | A wattmeter has a current coil of 0.1 Ω resistance and a pressure coil of 6500 Ω resistance. Calculate percentage errors, due to resistance when pressure coil is connected on (1) supply side (2) Load side. |
| 20 | Derive the torque equation of Electrostatic Instrument. |
| 21 | An Electrostatic voltmeter reading up to 2000V is controlled by a sping with a torsion constant of 5*10-6 Nm.rad has a full scale deflection of 900 Capacitance at zero voltage is 15 pF. What will be the the capacitance when pointer will move to 2000 V. ? |
| 22 | Explain two wattmeter method used to measure power of a 3-phase balanced load. |
| 23 | Derive the Torque Equation for Energy Meter and mention what are errors occurred in the Energy Meter. |
| 24 | What are the various sources of error for Induction type energy meter? How can one overcome those errors? |
| 25 | Define phantom loading. |
| 26 | 5 A , 230 V meter on full load unity power factor test makes 60 revolutions in 360 seconds. If the normal disc speed is 520 revolution per KWh, what is the percentage error? |
| 27 | If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450 Watt is connected to it, Find the meter constant in rev/KWH. |
| 28 | Explain with suitable example that why voltmeter with higher sensitivity is essential for better acuracy in measurement? |
| 29 | Explain How Instrument transformers can be used for extension of range of an Instrument? |
| 30 | Explain briefly about CT and PT with relevant Diagrams. |
| 31 | With an example explain the concept of burden on CT. |
| 32 | Explain about various errors in CT. |
| 33 | A 500 A/ 5 A, 50 Hz current transformer has a bar primary. The secondary has burden is a pure resistance of 1 Ω and it draws a curren of 5 A. If magnetic core requires 250 AT for magnetization, what will be the percentage ratio error? |
| 34 | Explain about westen type frequency meter. |
| 35 | Explain Rectifier type instrument working and its application. |
| 36 | Draw neat sketch of single phase electrodynamometer type power factor meter. Explain its working. |
| Chapter 3: Measurement of Parameters | |
| 37 | Derive the Generalized Equation for A.C Bridges at Balance Condition. |
| 38 | State the applications of whestons bridge. |
| 39 | Explain about Maxwell Bridge and Hay's Bridge. |
| 40 | classify the resistance based on the range of the Measurement. |
| 41 | What are the methods can be used for the Measurement of Low resistance |
| 42 | explain briefly about Kelvin bridge and Kelvin Double Bridge witth relevant diagram and equation. |
| 43 | What are the prectical difficulties in measurement of High resistance? |
| 44 | What are the methods can be used for measurement of High resistance? |
| 45 | Explain briefly about application and importance of Megger and Eart tester for Earth Resistance measurement. |
| 46 | Describe working of low voltage schering bridge. State is practical application. |
| 47 | Wein bridge has the following specifications. arm ab: A resistance of 200 Ω in parrallel with a capacitance of 1 µF. arm bc: A resistance of 400 Ω. arm cd: A resistance of 1000 Ω. arm da : A resistance of R2 in series with a capacitance of 2 µF. Determine R2 and frequency at which bridge will balance. |
| 48 | Write short note on Desaunty's bridge. |
| 49 | Explain Anderson's bridge with vector diagram. |
| 50 | what are the application of Maxwell's and Hay's Bridge ? |
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