Bihar Engineering university Electronics Instrument and Measurements(EEM) Question paper with solution. EIM PREVIOUS YEAR SOLUTION 2022. BEU pyq solution ECE branch.
(a) What is meant by accuracy of an instrument?
(b) How is ammeter connected in a circuit to measure the current?
(c) Which material for shunts is suitable in DC instruments?
(d) A 1 mA meter movement with an internal resistance of 50 is to be converted into ammeter. a 0 mA-100 mA Calculate the shunt resistance required.
(e) What is a watt-hour meter?
(f) What is the use of galvanometer?
(g) What are the uses of DC bridges?
(h) Can the AC potentiometer be used to measure self-inductance? Give proper justification of your answer.
(4) What is flux meter?
(j) Define current sensitivity and voltage sensitivity.
BEU EIM 2022 solution pdf is provided below
2.(a) A mercury thermometer has a capillary tube of 0-25 mm diameter. If the bulb is made of a zero expansion material, what volume must it have if a sensitivity of 2 mm/°C is desired? Assume that the operating temperature is 20 °C and the coefficient of volumetric expansion of mercury is 0-181×10-3/°C.
(b) Explain the construction and working principle of the permanent magnet moving coil (PMMC) instruments.
3. (a) Explain the theory of current transformers with suitable diagram.
(b) A moving coil instrument gives a full-scale deflection of 10 mA when the potential difference across its terminals is 200 mV. Calculate (i) the shunt resistance for a full-scale deflection corresponding to 100 A and (ii) the series resistance for full-scale reading with 1000 V. Calculate the power dissipation in each case.
4. (a) Explain the construction and working principle of ballistic-type galvanometer.
(b) The coil of a moving coil galvanometer is wound on a non-magnetic former whose height and width are both 2 cm. It moves in a constant field of 0-12 Wb/m². The moment of inertia of its moving parts 0-25×10 kg-m², and the control spring constant is 30×10 N-m/rad. Calculate-
(i) the number of turns that must be wound on the coil to produce a deflection of 150° with a current of 10 mA;
(ii) the resistance of the coil to produce critical damping, all damping being assumed as electromagnetic.
(a) Explain the deflection-type of Wheatstone bridge with neat diagram.
(b) A simple equal arm voltage sensitive bridge is initially in balance (null). Three of the arms consist of ordinary resistors, while the fourth is a thermistor. Each arm has nominal resistance of a 10000 2 and the bridge is energized with a 6 V DC source.
(i) If the temperature change causes a +5% change in thermistor resistance, what output voltage will be indicated from the bridge?
(ii) If a -5% change in resistance is caused, what will be the bridge output?
- (a) Explain the construction and working of Crompton potentiometer.
(b) A linear resistance potentiometer is 50 mm long and is uniformly wound with a wire having a resistance 10000 £ Under normal conditions, the slider is at the centre of the potentiometer. Find the linear displacement when the resistances of the potentiometer as measured by a Wheatstone bridge for two cases, are (i) 3850 and (ii) 7560 2. Are the two displacements in the same direction? If, it is possible to measure a minimum value of 10 resistance with the above arrangement, find the resolution of the potentiometer in mm.
7. (a) Explain the determination of hysteresis loop with reversal method.
(b) Explain the Lloyd-Fisher iron loss measuring method with test setup.
8. (a) Explain the working principle of a typical digital voltmeter with block diagram.
(b) A frequency counter with an accuracy of +1 LSD + (1×10−6) is employed to measure input frequencies of 100 Hz, 1 MHz and 100 MHz. Calculate the percentage measurement error in each case.
- (a) Explain the working of Wein’s bridge. State also the advantage/disadvantage.
(b) Explain with suitable diagram the measurement of time period of an input signal.
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