Question Paper: Electrical Technology and Instruments Question Paper - December 2015 - Instrumentation Engineering (Semester 4) - Mumbai University (MU)
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## Electrical Technology and Instruments - December 2015

### MU Instrumentation Engineering (Semester 4)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

### Solve any four:

1 (a) What is Back emf? Explain significance of back emf? 5 marks

1 (b) Explain power flow diagram for an Induction Motor. 5 marks

1 (c) Differentiate between D.C. Motor and Single phase induction motor. 5 marks

1 (d) What are the sources of error in case of Wheatstone bridge? 5 marks

1 (e) What is power factor? Explain basic Voltmeter and Ammeter. 5 marks

2 (a) A 400 volts shunt motor develops an output of 18.5 kw when taking 22.5 kw Field resistance is 200Ω and armature resistance is 0.4 Ω. What is the efficiency and power input when output is 9 kw. 5 marks

2 (b) Explain speed control method of DC motor. 5 marks

3 (a) Explain losses those takes place in induction motor. 5 marks

3 (b) Explain torque slip characteristics of 3 phase induction motor. 5 marks

4 (a) What is Q factor? Explain its measurement in detail. 5 marks

4 (b) Explain the construction and working of PMMC instrument? 5 marks

5 (a) Explain the operation of shunt and series type ohm meters. 5 marks

5 (b) Explain Capacitance Comparison Bridge and derive balance equation. 5 marks

6 (a) Explain difficulties in measurement of high resistance? Explain use of guard circuits. 5 marks

6 (b) Draw and explain block diagram of DMM. 5 marks

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