Mechanical Engineering - Online Test
Q1. Which of the following is the correct data structure for solid models?
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. A solid disc of radius r rolls without slipping on a horizontal floor with angular velocity ω and
angular acceleration α. The magnitude of the acceleration of the point of contact on the disc is
Answer : Option D
Explaination / Solution:
Tangential acceleration will be zero, radial acceleration will exist.
Hence, Total acceleration = rω2
Q3. Water (Cp = 4.18 kJ/kg.K) at 80℃ enters a counter flow heat exchanger with a mass flow rate of
0.5 kg/s. Air (Cp = 1 kJ/kg.K) enters at 30℃ with a mass flow rate of 2.09 kg/s. If the
effectiveness of the heat exchanger is 0.8, the LMTD (in ℃) is
Answer : Option C
Explaination / Solution:
Q4. For the function ex , the linear approximation around x = 2 is
Answer : Option A
Explaination / Solution:
Neglecting higher powers
Q5. Which of the following forecasting methods takes a fraction of forecast error into account for the
next period forecast?
Answer : Option D
Explaination / Solution:
No Explaination.
Q6. The following are the data for two crossed helical gears used for speed reduction:
Gear I : Pitch circle diameter in the plane of rotation 80 mm and helix angle 30°
Gear II : Pitch circle diameter in the plane of rotation 120 mm and helix angle 22.5°
If the input speed is 1440 rpm, the output speed in rpm is
Answer : Option C
Explaination / Solution:
For helical gears
Q7. A large tank with a nozzle attached contains three immiscible, inviscid fluids as shown.
Assuming that the changes is h1, h2 and h3 are negligible, the instantaneous discharge velocity is
Answer : Option A
Explaination / Solution:
No Explaination.
Q8. Consider the function f (x) = x − x − . The maximum value of f (x) in the closed interval [− 4, 4] is
Answer : Option A
Explaination / Solution:
We have
f (x) = x − x +
Q9. Minimum shear strain in orthogonal turning with a cutting tool of zero rake angle is
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. For an opaque surface, the absorptivity (α), transmissivity (τ) and reflectivity (ρ) are related by
the equation:
Answer : Option B
Explaination / Solution:
No Explaination.
