AP PGECET Question Paper 2025 for Instrumentation Engineering is available for download here with answer key and solution PDF. AP PGECET 2025 was conducted from June 6 to June 8 in two shifts.
AP PGECET Question Paper 2025 consists of 120 MCQ-based questions in total carrying 1 mark each to be attempted in the duration of 2 hours.
AP PGECET Instrumentation Engineering Question Paper
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The gauge factor of semiconductor strain gauge is higher than ordinary metal wire resistive strain gauge because of:
Gauge factor of strain gauge indicates its:
Dummy strain gauge is used:
The gauge factor of semiconductor strain gauge is in the range of:
The input impedance of CRO is nearly:
The principle of operation of LVDT is based on the operation of:
Which of the following will be the best selection for the core of an LVDT?
The devices which are used for the measurement of very high temperature are:
An example of variable area device for measuring flow is:
In a venturimeter, the flow is 0.15 m\(^3\)/s when the differential pressure is 30 kN/m\(^2\). What is the flow when the differential pressure is 60 kN/m\(^2\)?
A variable reluctance type tachometer has 60 rotor slots. If the counter records 3600 counts per second, then the speed is:
A force digital transducer measures the pressure in the range of 0-200 N with a resolution of 0.1% of full scale. The smallest charge it can measure is:
Value of pH solution is 4. It indicates that the concentration of hydrogen ions is:
Which of the following is used to measure the thermal conductivity?
The resistance of the thermistor is 5000 \(\Omega\) at 20°C and its resistance temperature coefficient is 0.04°C. A measurement with a lead resistance of 10 \(\Omega\) will cause an error of:
Which of the following is an inverse transducer?
Psychrometer is used for the measurement of:
An op-amp has an offset voltage of 1 mV and is ideal in all other respects. If this op-amp is used in the circuit shown in figure below, the output voltage will be (select the nearest value):
If the op-amp in figure is ideal, the output voltage \(V_{out}\) will be equal to:
For the op-amp circuit shown in the figure below, \(V_o\) is:
When the switch \(S_2\) is closed, the gain of the programmable gain amplifier shown in the following figure is:
If the differential voltage gain and the common mode voltage gain of the differential amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is:
The op-amp and the 1 mA current source in the circuit of figure are ideal. The output of the op-amp is:
A 741-type op-amp has a gain bandwidth product of 1 MHz. A non-inverting amplifier using this op-amp and having a voltage gain of 20 dB will exhibit a 3 dB bandwidth of:
What is the order of minimum displacement that can be measured with a capacitive transducer?
Capacitive transducers are normally used for:
To reduce the effect of fringing in a capacitive type transducer,
Piezoelectric transducers are:
Piezoelectric crystals produce an EMF when:
The least suitable transducer for static pressure measurement is:
A linear variable differential transformer (LVDT) is:
A properly biased JFET will act as a:
The type of power amplifier which exhibits crossover distortion in its output is:
Which one of the following oscillators is used for generation of high frequencies?
What is the main advantage of a JFET-cascade amplifier?
A differential amplifier has \(R_L = 10\,k\Omega\) (equal values in both collectors), \(h_{ie} = 1\,k\Omega\), \(R_e = 50\,k\Omega\), \(h_{fe} = 100\). The common mode is given by:
The open loop voltage gain of an amplifier is 240. The noise level in the output without feedback is 100 mV. If a negative feedback with \(\beta = \dfrac{1}{60}\) is used, the noise level in the output will be:
PMMC type instrument normally used for:
Kelvin’s double bridge is used for the measurement of:
Two resistances \(100 \pm 5\,\Omega\) and \(150 \pm 15\,\Omega\) are connected in series. If the errors are specified as standard deviations, the resultant error will be:
A PMMC meter rated at 100 \(\mu\)A is used in a rectifier type of instrument which uses full wave rectification. What is the sensitivity on sinusoidal AC?
When testing a coil having a resistance of \(10\,\Omega\), resonance occurred when the oscillator frequency was \(10\,MHz\) and the rotating capacitor was set at \(\dfrac{500}{2\pi}\,pF\). The effective value of the Q of the coil is:
The resistance can be measured most accurately by:
Schering bridge is used to:
X and Y plates of a CRO are connected to unequal voltages of equal frequency with phase shift of \(90^\circ\). The Lissajous pattern observed on the CRO screen is ............
Q meter operates on the principle of:
The transmittance of a particular solution measured is \(T\). The concentration of the solution is now doubled. Assuming that Beer-Lambert’s law holds good for both the cases, the transmittance for the second would be:
In a spectrophotometer, the monochromator must be able to resolve two wavelengths 599.9 nm and 600.1 nm. The required resolution is:
Which of the following is the value for the action potential of a cell?
The mathematical basis for Nuclear Magnetic Resonance (NMR) states that if \(\mu\) is the nuclear magnetic moment of the molecule, the gyromagnetic ratio is proportional to:
Normal diastolic blood pressure ranges from (in mm Hg):
The counter method used for counting of the blood cells is based in the principle of the:
On testing a blood sample it is found that it contains 15 g of Hb per decilitre of blood sample and a PVC of 0.45. Find the mean cell haemoglobin concentration for the blood sample:
A good indicator of cardiovascular system is:
Which of the following type of image is produced by CT scan machine?
Which of the following is a preferred electrode for measuring EMG?
When intramuscular EMG is required to look into the electrical activities of deeper or overlaid muscles, ........... electrodes are used.
The contraction of the skeletal muscles results in the generation of action potential in the individual muscle fibers. Record of this action potential is called ............
Disturbance in the EEG pattern resulting from the external stimuli is called .............
Which rhythm is the principal component of the EEG that indicates the alertness of the brain?
Normal EEG frequency range is ............
Which of the following is a wireless ECG acquiring system?
Recording electrical activities associated with heart is known as .............
Welsh cup electrodes have .............
In X-ray spectrometers, the specimen or the sample is placed after which of the following components?
In calibration of a dynamometer Wattmeter by potentiometer, phantom loading arrangement is used because:
In electrodynamometer type wattmeter, the inductance of pressure coil produces error. The error is:
The phenomena of ‘creeping’ occurs in:
A moving-coil instrument gives full-scale deflection for 1 mA and has a resistance of \(5\ \Omega\). If a resistance of \(0.55\ \Omega\) is connected in parallel to the instrument, what is the maximum value of current it can measure?
In a permanent magnet moving coil instrument, if the control spring is replaced by another one having a higher spring constant, then the natural frequency and damping ratio will:
Rectifier moving coil instrument responds to:
For increasing the range of voltmeter, connect a:
A dual-trace CRO has:
Find \(V_{Th}\) and \(R_{Th}\) in the figure shown below.
In the below circuit, the value of \(V_1\) is:
If \(R_1 = R_2 = R\) and \(R_3 = 1.1R_4\) in the bridge circuit shown in figure, then the reading in the ideal voltmeter connected between \(a\) and \(b\) is:
The energy required to charge a \(10\ \muF\) capacitor to \(100\ V\) is:
A \(100\ \Omega\), 1 W resistor and a \(800\ \Omega\), 2 W resistor are connected in series. The maximum DC voltage that can be applied continuously to the series circuit without exceeding the power limit of any of the resistors is:
A piezoelectric type accelerometer has a sensitivity of 100 mV/g. The transducer is subjected to a constant acceleration of 5 g. The steady-state output of the transducer will be:
A thermistor has a resistance of \(10\ k\Omega\) at \(25^\circ\)C and \(1\ k\Omega\) at \(100^\circ\)C. The range of operation is \(0^\circ\)C to \(150^\circ\)C. The excitation voltage is 5 V and a series resistor of \(1\ k\Omega\) is connected to the thermistor. The power dissipated in the thermistor is:
Which of the following logics possesses highest noise immunity?
What decides the bit size of 8085 microprocessor?
What is the maximum addressing capacity of 8085 microprocessor?
The number of hardware interrupts (which require an external signal to interrupt) present in an 8085 microprocessor are:
What is the vector address of RST 6.5 interrupt?
How many special function registers are there in 8051 microcontroller?
The binary representation of the decimal number 1.375 is
Which of the following controller produces zero offset?
The maximum phase shift that can be provided by a lead compensator with transfer function \(G(s) = \dfrac{1 + 6s}{1 + 2s}\) is:
If the characteristic equation of a closed-loop system is \(s^2 + 2s + 2 = 0\), then the system is:
The Bode plot of the transfer function \(G(s) = 5\) is:
The type denotes the number of:
In majority of instruments damping is provided by:
What determines the light intensity in a CRT?
An ideal op-amp has CMRR:
Which of the following is the best method for determining the stability and transient response?
A \(10\ \muF\) capacitance charged to \(10\ V\) has a stored charge equal to:
The internal resistance of armature should ideally be:
Hot wire anemometer is used to measure:
The electrical output down a thermocouple circuit is detected by using:
Load cells are used for measurement of:
A dead weight tester is used for:
Which instrument has the manual Null balance operation?
Flapper nozzle is used in following controller?
The most common pneumatic signal standard for industrial process instruments is:
Cavitation in a control valve is caused by:
Photo conductive cells are made by:
A system defined by the difference equation \(y(n) = x(-n)\) is:
A linear discrete-time system has the characteristic equation, \(z^3 - 0.81z = 0\), the system is:
Kirchhoff's current law is valid for:
If \(A = \begin{pmatrix} 2 & -1
3 & 2 \end{pmatrix}\) is a \(2 \times 2\) matrix, then the eigenvalues of the matrix \(2A^2 - 4A + 5I\) are ........., where \(I\) is the \(2 \times 2\) unit matrix.
If \((a, b, c)\) is the unique solution of the system of linear equations
\(x + y + z = 2, \quad 2x + y - z = 3, \quad 3x + 2y + z = 4\),
then \(b^2 + c^2 = ........\)
Let \(f(x) = x^3 - \dfrac{9}{2} x^2 + 6x - 2\) be a function defined on the closed interval \([0,3]\). Then, the global maximum value of \(f(x)\) is ............
The directional derivative of \(f(x, y, z) = xyz\) at the point \((1, 2, 3)\) in the direction of the vector \(2\hat{i} + \hat{j} - 2\hat{k}\) is ............
If \(C\) is the boundary of the region enclosed by the curves \(y = \sqrt{x}\) and \(y = x^2\), then the value of the line integral
\[ \int_C \left( (3x^2 - 8y^2) \, dx + (4y - 6xy) \, dy \right) = ............ \]
The particular integral of the differential equation
\[ \frac{d^2y}{dx^2} - 6 \frac{dy}{dx} + 9y = e^{3x} is ............ \]
The value of the integral
\[ \int_C \frac{6z - 5}{z^2 + 4z + 5} \, dz, \quad where C is the circle |z| = 1, is ............ \]
If \(X\) is a continuous random variable with the probability density
\[ f(x) = \begin{cases} K(1 - x^3), & 0 < x < 1
0, & otherwise \end{cases} \]
Then, the value of \(K\) is ............
A machine produces 0, 1 or 2 defective items in a day with probabilities of \(\frac{1}{4}, \frac{1}{2}, \frac{1}{4}\) respectively. Then, the standard deviation of the number of defective items produced by the machine in a day is ............
The Newton-Raphson method is used to find the root of the equation
\[ f(x) = e^{-x} - x \]
If the initial guess for the root is 0, then the estimate of the root after the first iteration is ............
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