Biomedical Engineering Gate 2020 Questions with Answer
Ques 14 GATE 2020
The arrangement of four resistors of equal value in the diaphragm of a physiological pressure measurement catheter is shown below. The applied pressure is observed to cause an increase in length of resistors R2, R4 and an increase in cross sectional area in R1 and R3. The operation results in an equal change in the values of all four resistors. Which among the configuration given below should be used to connect the resistors to form a Wheatstone bridge so that bridge output voltage is proportional to the change in resistance of individual resistors?
Ques 15 GATE 2020
During a non-invasive measurement of blood pressure, mean arterial pressure was observed to be 100 mm Hg. If systolic pressure is 150 mm Hg, the diastolic pressure would be
Ques 16 GATE 2020
A patient is initially imaged in a 1 Tesla MRI scanner and induced voltage is found to be equal to V1. The expression for the magnitude of the received voltage in RF coil is given below.
|V| = 2πγoVsMo(Sinα)βr
where Vs is MR slice volume, M0 is magnitude of resultant magnetic vector at equilibrium, γ0 is Larmor frequency, α is tip angle, βr is magnetic field sensitivity of receive coil.
When the patient is shifted to a 3 Tesla MRI scanner that uses the same RF coil and the slice thickness is halved, the magnitude of the induced voltage was found to be equal to V2. The ratio V2/V1 is _______.
Ques 17 GATE 2020
A 3 MHz ultrasound transducer transmits a 3-cycle long pulse into a soft tissue at normal incidence to fat and liver interface. The axial resolution (mm) and the amplitude reflection coefficient at fat-liver interface, respectively, are _______.
Use Ctissue = 1500 m/s, Cfat = 1450 m/s, Cliver = 1570 m/s, ρfat = 920 kg/m³, ρliver = 1060 kg/m³
Ques 18 GATE 2020
A chest radiograph of 36 cm × 48 cm is digitized. If we want to preserve details in the image to a spatial resolution of 6 cycles/mm, the approximate image data size in MB for an 8 bit quantization is _______ (rounded off to two decimal places).
Ques 19 GATE 2020
An X-ray radiography scenario is shown in the figure. If the number of incident photons (Ni) is equal to 2 × 10⁶ at 50 keV, the number of photons (Nd) that exit the tissue is _______ × 10⁶ (rounded off to two decimal places). (use linear attenuation coefficient for soft tissue and blood at 50 keV as 0.4 cm⁻¹ and 0.2 cm⁻¹ respectively).
Ques 20 GATE 2020
In a permanent magnetic moving coil (PMMC) instrument having following specifications, the angular deflection of the pointer for a coil current of 100 μA will be _______ degrees (rounded off to one decimal place).
Magnetic flux density = 1.5 Tesla,
Torsional spring constant = 2 × 10⁻⁶ Nm/deg,
Cross sectional area of the coil = 2.5 cm²,
Number of turns of the coil = 500
Ques 21 GATE 2020
In the process of measuring blood flow from an artery using C-clamp magnetic flow probe, the voltage recorded across diametrically opposite sites of the artery is 3.75 nV. The blood flow rate through the artery is _______ cm³/s (rounded off to two decimal places).
The inner diameter of the C-clamp = 0.5 cm,
The magnetic flux density = 1.5 × 10⁻⁵ Wb/m²
Ques 22 GATE 2020
Which of the following is NOT a part of knee joint?
Ques 23 GATE 2020
During a routine stethoscopic examination at the left midclavicular-5th intercostal space, murmurs were noted between first and second heart sound. The possible abnormality among the following could be
Ques 24 GATE 2020
The thin filament of a muscle fiber is comprised of
Ques 25 GATE 2020
Hydrolysis of one ATP molecule provides an energy of _______ kilo calories (correct up to one decimal place).
Ques 26 GATE 2020
The resting potential of a mammalian nerve cell is -80 mV. A certain drug administered to the body changes the intracellular K⁺ concentration from 150 mmol/L to 55 mmol/L. The nearest value of cell membrane potential after the drug administration, assuming that the external equilibrium of K⁺ does not get changed during the event, is _______.
(Gas constant = 8.315 J/mol/K, core temperature = 37 °C and Faraday constant = 96500 C/mol)
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