Instrumentation Engineering
GATE IN format:mcq PYQs
Build your understanding with focused practice from past exam papers.
Questions 281–290 of 360. Imported answers require independent review unless marked reviewed.
Question 36
Open questionINMCQ2 marksNeeds review
In the circuit below, the light dependent resistor (LDR) receives light from the LED. The LDR has resistances of 5 kΩ and 500 Ω under dark and illuminated conditions, respectively. The LED
is OFF at time
. At time
s, the switch
is closed for 1 ms and then kept open thereafter. Assuming zero propagation delay in the devices, the LEDYour answerChoose one option.
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A differential capacitive sensor with a distance between the extreme plates 100 mm is shown in figure below. The difference voltage
, where
and
are the rms values, for a downward displacement of 10 mm of the intermediate plate from the central position, in volts, is
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A piezoelectric transducer with sensitivity of 30 mV/kPa is intended to be used in the range of 0 kPa to 100 kPa. The readout circuit has a peak noise amplitude of 0.3 mV and measured signals over the full pressure range are encoded with 10 bits. The smallest pressure that produces a non-zero output, in units of Pa, is approximately
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A 100 W light source emits uniformly in all directions. A photodetector having a circular active area whose diameter is 2 cm is placed 1 m away from the source, normal to the incident light. If the responsivity of the photodetector is 0.4 A/W, the photo-current generated in the detector, in units of mA, is
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A resistance-meter has five measurement range-settings between 200 Ω and 2 MΩ in multiples of 10. The meter measures resistance of a device by measuring a full-range voltage of 2 V across the device by passing an appropriate constant current for each range-setting. If a device having a resistance value in the range 8 kΩ to 12 kΩ and a maximum power rating of 100 μW is to be measured safely with this meter, the choice for range-setting on the meter for best resolution in measurement, in kΩ, is
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A pulsed laser emits rectangular pulses of width 1 nanosecond at a repetition rate of 1 kHz. If the average power output is 1 mW, the average power over a single pulse duration, in watts, is
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Four identical resistive strain gauges with gauge factor of 2.0 are used in a Wheatstone bridge as shown in the figure below. Only one of the strain gauges
changes its resistance due to strain. If the output voltage
is measured to be 1 mV, the magnitude of strain, in units of microstrain, is
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 1
Open questionGAMCQ1 markNeeds review
“When she fell down the ______, she received many ______ but little help.” The words that best fill the blanks in the above sentence are
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“In spite of being warned repeatedly, he failed to correct his ________ behaviour.” The word that best fills the blank in the above sentence is
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Open questionGAMCQ1 markNeeds review
For
,
and
are both decreasing functions in the interval ________.Your answerChoose one option.
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