Instrumentation Engineering
GATE IN purpose:exam-prep PYQs
Build your understanding with focused practice from past exam papers.
Questions 501–510 of 650. 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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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 40
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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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Open questionINNAT2 marksNeeds review
The frequency response of a digital filter
has the following characteristics
Passband:
for
and
Stopband:
for
,
where
is the normalized angular frequency in rad/sample. If the analog upper cut off frequency for the passband of the above digital filter is to be 1.2 kHz, then the sampling frequency should be ______ kHz.Log in to check the answer
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In the circuit shown below, a step input voltage of magnitude 5 V is applied at node A at time
. If the capacitor has no charge for
, the voltage at node P at
is ______ V. (Answer should be rounded off to two decimal places)
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In the circuit shown below, the angular frequency
at which the current is in phase with the voltage is ______ rad/s.
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