The shorter wave length of the electron permits the detailed examination of tiny objects due to reduction of __________ effects
A. Reflection
B. Diffraction
C. Refraction
D. Polarization
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Pick the correct statement regarding functions of a transducer S1: Sense the magnitude, change in & / or frequency of same measurand S2: To provide electrical output that furnishes accurate, quantitative data about the measurand
A. S1 is true & S2 is false
B. S2 is true & S1 is false
C. Both S1 & S2 are true
D. Both S1 & S2 are false
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S1: In multimode fiber optics, intensity modulating schemes can be employed. S2: Schemes using polarizing techniques need birefringent fiber.
A. S1 is true and S2 is false
B. Both S1 and S2 are true
C. S1 is false and S2 is true
D. Both S1 and S2 are false
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Common mode rejection ratio is defined as ratio of
A. Common mode gain to differential mode gain
B. Differential mode gain to common mode gain
C. Common mode gain at input to differential mode gain at input
D. Common mode gain at output to differential mode gain at output
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Which of the following is a digital transducer?
A. Strain gauge
B. Encoder
C. Thermistor
D. LVDT
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___________ amplifier is used to drive the recorder.
A. Power amplifier
B. Pre amplifier
C. Operational amplifier
D. Differential amplifier
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The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc., are called as
A. Active transducer
B. Primary sensor
C. Passive transducer
D. Self generating transducer
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What is the total resistance of a voltmeter on the 10 V range when the meter movement is rated for 50 µA of full-scale current?
A. 10 kΩ
B. 20 kΩ
C. 200 kΩ
D. None of the above
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Which of the following recorder gives slow response
A. X-Y recorder
B. Oscillographic
C. Galvanometric
D. Magnetic
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An ideal amplifier has
A. Noise figure of 0 db
B. Noise figure of more than 0 db
C. Noise factor of unity
D. Noise figure of less than 1 db
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If the full-scale deflection current of a multimeter is 50 µA, its sensitivity is
A. 10 kΩ/V
B. 100 kΩ/V
C. 50 kΩ/V
D. 20 kΩ/V
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Which of the following is likely to have the largest resistance?
A. Voltmeter of range 10 V
B. Moving coil galvanometer
C. Ammeter of range 1 A
D. A copper wire of length 1 m and diameter 3 mm
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A VTVM is never used to measure ___________.
A. Voltage
B. Current
C. Resistance
D. None of the above
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A CRO is used to measure ___________.
A. Voltage
B. Frequency
C. Phase
D. All of above
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In foil strain gauge the thickness of foil varies from
A. 2.5 micron to 6 micron
B. 25 micron (or) less
C. 25 micron to 60 micron
D. 2.5 micron to 5 micron
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If the negative potential on the control grid of CRT is increased, the intensity of spot ___________.
A. Is increased
B. Is decreased
C. Remains the same
D. None of the above
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Isolation amplifier actually operates on the principle of
A. Filtering
B. Attenuation
C. Clipping
D. Amplification
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Storage oscilloscope operates on the principle of
A. Primary emission
B. Deflection
C. Secondary emission
D. Diffusion
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The principle of operation of LVDT is based on the variation of
A. Self inductance
B. Mutual inductance
C. Reluctance
D. Permanence
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_____________ is the example of photo emissive cell
A. LDR
B. Photo diode
C. Photo transistor
D. Photo multiplier
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