Electronic Measurement Exam Prep
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Electronic Measurement Exam Prep
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5 marks Long answer
Calculate the resonant frequency of the above circuit if the mutual inductance between the coils, M = 20μH.
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Resonant frequency = $f = rac{1}{2\pi\sqrt{LC}}$.
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5 marks Long answer
Name the transducer shown in the above diagram. What category of transducer does it fall into? Give reasons.
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It is an LVDT; falls under inductive transducers due to its working principle.
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5 marks Long answer
Calculate the gauge factor of a strain gauge, if the value of resistance is $152 \Omega$, which changes by $5 \Omega$ for $5000 \mu$ strain.
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Gauge factor = $\frac{\Delta R / R}{\epsilon} = \frac{5/152}{5000 \times 10^{-6}}$.
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4 marks Medium answer
Give reasons for any five of the following: (a) Platinum resistance thermometers are widely used in temperature measurement for industrial applications. (b) Digital storage oscilloscope can keep stored data for months. (c) A multimeter can be used for measuring both dc as well as ac quantities. (d) The electrons tend to converge in the form of a convex lens in the spaces between the anodes. (e) Themistor has a negative resistance effect. (f) Spectrum analyzer is preferred for the measurement of distortion.
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Answers should explain the reasons for each statement.
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4 marks Medium answer
Differentiate between active and passive pulse generators.
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Active generators require an external power source; passive do not.
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4 marks Medium answer
Differentiate between LVDT and RVDT.
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LVDT measures linear displacement; RVDT measures angular displacement.
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4 marks Medium answer
Why is a delay line connected to the vertical amplifier? State the range of the power supply given to the different components of the instrument.
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Delay line compensates for signal timing; power supply range is typically HV and LV.
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4 marks Medium answer
What are the requirements of the said instrument? State one application of this instrument.
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Requirements include stability and frequency range; application is in RF signal generation.
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3 marks Medium answer
What does the above diagram represent? Name the components that constitute the heart of this instrument.
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It represents a Cathode Ray Oscilloscope; heart components are the electron gun and deflection plates.
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3 marks Medium answer
A sinusoidal waveform has peak to peak amplitude of 6cm viewed on the phosphor screen. The vertical sensitivity is set to 5v/cm. calculate the peak voltage and rms value of the signal.
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Peak voltage = 30V; RMS value = 21.21V.
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3 marks Medium answer
How are the secondary windings connected and why?
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Connected in series opposition to cancel out common mode signals.
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2 marks Short answer
What is absolute error in measurement?
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The difference between the measured value and the true value.
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2 marks Short answer
What is the significance of Schmitt trigger in frequency measurement?
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It provides clean switching and noise immunity.
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2 marks Short answer
What are the phenomenona that govern the operation of a thermocouple?
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Seebeck effect and thermoelectric effect.
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2 marks Short answer
State one difference between spectrum analyzer and CRO.
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Spectrum analyzer measures frequency components; CRO displays waveforms.
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2 marks Short answer
What does the above circuit depict? Name the instrument where this circuit is found. What is the other component of this instrument?
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It depicts a transistor-based oscillator; found in signal generators; other component is LC tank circuit.
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1 marks Short answer
The basic form of bridge for the measurement of resistance.
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Wheatstone bridge
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1 marks Short answer
The smallest change in a measured value to which an instrument will respond to.
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Resolution
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1 marks Short answer
The Q meter operates on this principle.
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Resonance
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1 marks Short answer
Wave meter that can be used for measurement of harmonics.
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Harmonic wave meter
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1 marks Short answer
It is referred to as the heart of a function generator.
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Oscillator
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1 marks Short answer
(Piezoelectric/ Thermocouple/ Photovoltaic cell/ LVDT) is a passive transducer.
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Thermocouple
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1 marks Short answer
Beam of electrons in a cathode ray tube emanates because of (secondary emission/ thermionic emission/ diffusion/ post acceleration).
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thermionic emission
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1 marks Short answer
The circuit generally used in digital instruments to convert sine waves into rectangular pulses is a (sawtooth generator/ differential amplifier/ sample and hold circuit/ Schmitt trigger).
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Schmitt trigger
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1 marks Short answer
For the measurement of voltage of the order of mV a (rectifier amplifier/ amplifier rectifier/ diode peak reading/ slide back) type VTVM is used.
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diode peak reading
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1 marks Short answer
Kelvin's double bridge is used for the measurement of (very high resistance/ very low resistance/ quality factor of a coil/ inductance).
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very low resistance
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1 marks Short answer
The errors generally caused by human mistakes are ______ errors.
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Human errors
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1 marks Short answer
A ______ analyzer is an instrument which is used to measure relative amplitudes of a single frequency component in a complex waveform.
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Spectrum
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1 marks Short answer
Dual trace oscilloscope uses ______ electron gun.
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Dual
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1 marks Short answer
A thermocouple is a junction of two ______ metals.
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Dissimilar
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1 marks Short answer
The gauge factor of a strain gauge is always greater than ______.
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1
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