Biomedical Engineering GATE 2023 Questions with Answer

Ques 1 Biomaterials

Choose the option that has the biomaterials arranged in order of decreasing tensile strength.
(PMMA: poly-methyl-methacrylate)

Ques 2 Biomaterials

In a biomaterial, formation of hydrogen bonds on alcoholic groups will lead to a

Ques 3 Biomaterials

A water insoluble polymeric biomaterial can become water soluble in vivo by which of the following mechanisms?

Ques 4 Biomechanics

Consider the total hip joint prosthesis as shown in the figure. The geometric parameters of the prosthesis are such that L₁=40 mm, L₂=60 mm, θ₁=45°, θ₂=90°. Assume that, when standing symmetrically on both feet, a joint reaction force of 400 N is acting vertically at the femoral head (point A) due to the body weight of the subject. Calculate the magnitude of the moment (in Nm) about point C. (Round off the answer to one decimal place.)

Ques 5 Biomedical Instrumentation

Which one of the following bridges CANNOT be used for measuring inductance?

Ques 6 Biomedical Instrumentation

A polychromatic beam of X-Rays has an energy spectrum as shown in Figure P below. Which of the following graphs (in the options A to D) depicts the energy spectrum after passing through a human body? In each figure, the horizontal axis represents Energy in keV and the vertical axis represents Relative X-ray Intensity.

A

B

C

D

Ques 7 Biomedical Instrumentation

A 5 MHz ultrasound transducer is being used to measure the velocity of blood. When the transducer is placed at an angle of 45° to the direction of blood flow, a frequency shift of 200 Hz is observed in the echo. Assume that the velocity of sound is 1500 m/s. What is the velocity (in cm/s) of the blood flow? (Round off the answer to one decimal place.)

Ques 8 Biomedical Instrumentation

A 20 mV DC signal has been superimposed with a 10 mV RMS band-limited Gaussian noise with a flat spectrum up to 5 kHz. If an integrating voltmeter is used to measure this DC signal, what is the minimum averaging time (in seconds) required to yield a 99% accurate result with 95% certainty?

Ques 9 Biomedical Instrumentation

The free induction decay (FID) in the MRI of an object can be approximated as
s(t)=∫∫m(x,y)e^{-j2π(K_x(t)x+K_y(t)y)}dxdy,
where K_x(t)=∫₀^tG_x(τ)dτ and
K_y(t)=∫₀^tG_y(τ)dτ
. Here G_x and G_y are pulses of identical period and are in-phase. By changing the amplitude of the pulses, one can obtain the two dimensional Fourier transform of the object

Ques 10 Biomedical Instrumentation

An ultrasound plane wave of amplitude P₀ hits the semi-infinite boundary of two media having acoustic impedances Z₁ and Z₂. The sum of the amplitudes of the reflected and the incident waves at the boundary is equal to

Ques 11 Biomedical Instrumentation

The resistance of a thermistor is 1 kΩ at 25°C and 500 Ω at 50°C. Find the temperature coefficient of resistance (in units of °C⁻¹) at 35°C. (Round off the answer to three decimal places.)

Ques 12 Biomedical Instrumentation

A normally incident X-ray of energy 140 keV passes through a tissue phantom and is detected by the detector as shown in the figure below. The phantom consists of tissue P with an absorption coefficient of 1 cm⁻¹ and a thickness of 1 cm, and tissue Q with an absorption coefficient of 10 cm⁻¹ and a thickness of 2 cm. Calculate the intensity (in µeV) detected by the detector. (Round off the answer to one decimal place.)

Ques 13 Biomedical Instrumentation

A two-dimensional square plate (20 mm sides) contains a homogeneous circular inclusion of 5 mm diameter in it. A parallel beam of X-rays (beam width 30 mm) is used in a tomography system to determine the location of the inclusion. What is the minimum number of views required to approximately determine the location of the inclusion?