Questionbanks  EEM 
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MODULE1 1. Explain with formulas the concepts of ‘limiting error’, ‘relative error’ and ‘percentage error’. What is the relation between accuracy and error? 2. Derive the equation for deflecting torque in PMMC type instrument. 3. Explain the construction and working of Power factor meter. Draw the necessary diagrams. 4. Compare Electrodynamometer type instruments, MI instruments and PMMC instruments. List down the advantages and disadvantages of each. 5. Differentiate between indicating and integrating instrument. 6. Explain construction, working principle of moving iron instrument and hence derive the torque equation. 7. Describe the construction and working principle of dynamometer type wattmeter. 8. Differentiate between indicating and integrating instrument. 9. Explain construction, working principle of moving iron instrument and hence derive the torque equation. 10. Describe the construction, working principle and theory of dynamometer type wattmeter. 11. Ballistic Galvanometer 12. Discuss various types of errors. How are these errors minimized? 13. Compare the controlling torque of spring force and gravitational force. 14. Weston type Synchroscope. 15. Draw the multiplier circuit for voltmeter and explain. MODULE2 1. Draw the circuit diagram of dual slope integrator type DVM. Also draw all appropriate waveforms. 2. Explain the construction and working of dual slope type DVM with proper diagram and waveforms. 3. Explain the construction and working of digital phase meter. Draw the necessary diagrams and waveform. 4. Derive the expression for deflection ‘θ’ in terms of current ‘I’ for attraction type MI instrument. 5. Explain the working of digital frequency meter and show it is useful for time interval measurement. 6. Explain accuracy, precision, sensitivity and resolution. 7. Draw the circuit diagram of Digital frequency meter and explain. MODULE3 1. Explain Kelvin’s double bridge to measure low resistance and hence derive the equation for unknown resistance. 2. Explain the construction and working of megger. 3. Explain why Wheatstone bridge is not used for measuring low value of resistance. MODULE4 1. Draw the circuit diagram and phasor diagram of Anderson’s bridge. Derive the equation for unknown inductance in terms of bridge parameters. 2. Explain with suitable diagram measurement of very low, medium and very high impedance measurement using Q meter. Also derive the expression for unknown impedance in each case. 3. Explain Maxwell’s Inductance bridge to measure selfinductance. Derive the equation for selfinductance and draw phasor diagram. 4. Explain a Desauty's bridge to measure the capacitance of a capacitor. MODULE5 1. Explain measurement of unknown potential using standard DC potentiometer. 2. Explain the construction and working of D.C. Crompton type potentiometer. MODULE6 1. Derive the equation for voltage developed ‘V’ in a piezoelectric crystal in terms of applied pressure ‘P’. 2. Explain the construction and working principle of LVDT. 3. Explain with block diagram Ramp type digital voltmeter. 4. Explain the working principle of piezoelectric transducers. 5. Explain Resistance temperature detector (RTD) with diagram 
