Download GTU BE/B.Tech 2019 Summer 4th Sem New 2141704 Measurement And Instruments Question Paper

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Subject Code: 2141704

GUJARAT TECHNOLOGICAL UNIVERSITY

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SEMESTER-IV(NEW) — EXAMINATION — SUMMER 2019

Subject Name: Measurement & Instruments

Time: 02:30 PM TO 05:00 PM Date: 15/05/2019 Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. (a) Difference between inductance and capacitance. [03]
2. (b) Define ‘indicating’ and ‘recording’ types of instruments. Give an example for each. [04]
3. (c) Discuss Whetstone bridge to find out unknown resistance with circuit diagram. [07]

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1. (a) What is a Lissajous pattern in oscilloscope? Explain its applications. [03]
2. (b) Explain Zero-beat Frequency Meter in brief. [04]
3. (c) With neat block diagram explain Vertical deflection subsystem of oscilloscope. [07]

   OR

4. (a) What is full form of ‘PMMC’? Discuss working of PMMC meter with diagram. [07]

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1. (a) What is transformer? Write down types and applications of transformers. [03]
2. (b) Explain special purpose analog meter. [04]
3. (c) Draw and explain Analog to Digital converter. [07]

   OR

4. (a) Discuss about types of ‘resistors’. [03]

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1. (b) A moving coil instrument gives a full-scale deflection for a current of 20 mA with a potential difference of 200 mV across it. Calculate:
   1) Shunt required to use it as an ammeter to get a range of 0-200 A
   i) Multiplier required to use it as a voltmeter of a range 0 -500 V. [04]
2. (c) Explain Digital Voltmeter. [07]

1. (a) Explain weighted Binary Resistive type DAC. [03]

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2. (b) With block diagram explain working of Digital Multi-meters. [04]
3. (c) What are Universal Time-Counters? Explain with Block diagram. [07]

   OR

4. (a) How Voltmeter- Ammeter method can be used to measure unknown resistance? Explain in detail. [03]

1. (b) What is inductive interference? Explain how it can be reduced. [04]

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2. (c) Explain Schering bridge method to measure unknown capacitance. [07]

1. (a) Give the differences between current transformer and potential transformer. [03]
2. (b) The arms of a four-arm wien bridge a, b, c and d supplied with sinusoidal voltage have the following values.
   arm ab: A resistance of 800 O in parallel with a capacitance of 2 pF
   arm bc: 400 kO resistance
   

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   arm cd: 1 kO resistance
   arm da: A resistance R2 in series with 2 pF capacitance [04]
3. (c) Draw & explain block diagram of CRO. [07]

   OR

1. (a) Define Hall effect coefficient. [03]

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2. (b) Describe how to use dynamometer to measure power quantity. [04]
3. (c) Explain Poly-Phase measurements in detail. [07]

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