Mechanical Engineering - Online Test
Q1. Steam enters an adiabatic turbine operating at steady state with an enthalpy of 3251.0 kJ/kg and
leaves as a saturated mixture at 15 kPa with quality (dryness fraction) 0.9. The enthalpies of the
saturated liquid and vapor at 15 kPa are hf = 225.94 kJ/kg and hg = 2598.3 kJ/kg respectively.
The mass flow rate of steam is 10 kg/s. Kinetic and potential energy changes are negligible. The
power output of the turbine in MW is
Answer : Option C
Explaination / Solution:
Q2. Calculate the punch size in mm, for a circular blanking operation for which details are given
below.
Size of the blank 25 mm
Thickness of the sheet 2 mm
Radial clearance between punch and die 0.06 mm
Die allowance 0.05 mm
Answer : Option A
Explaination / Solution:
No Explaination.
Q3. For the set of equations
The following statement is true
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. For the truss shown in figure, the magnitude of the force in member PR and the support reaction at R
are respectively
Answer : Option C
Explaination / Solution:
Q5. Oil flows through a 200 mm diameter horizontal cast iron pipe (friction factor, f = 0.0225) of
length 500 m. The volumetric flow rate is 0.2 m3/s. The head loss (in m) due to friction is (assume g = 9.81 m/s2)
Answer : Option A
Explaination / Solution:
4f = 0.0225 
L = 500 m
Q = 0.2 m3/s
Q6. Two cutting tools are being compared for a machining operation. The tool life
equations are:
Carbide tool: VT1.6 = 3000
HSS tool: VT0.6 = 200
Where V is the cutting speed in m/min and T is the tool life in min. The carbide
toll will provide higher tool life if the cutting speed in m/min exceeds
Answer : Option B
Explaination / Solution:
No Explaination.
Q7. A pinion with radius r1, and inertia I1 is driving a gear with radius r2 and inertia I2. Torque τ1 is applied on pinion. The following are free body diagrams of pinion and gear showing
important forces (F1 and F2) of interaction. Which of the following relations hold true?
Answer : Option D
Explaination / Solution:
F1 = F2 [Vertical equilibrium]
For Gear 1 For Gear 2
Q8. An ideal gas of mass m and temperature T1 undergoes a reversible isothermal process from an
initial pressure P1 to final pressure P2. The heat loss during the process is Q. The entropy change ∆S of the gas is
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. The trace and determinant of a 2 × 2 matrix are known to be –2 and –35 respectively. It’s Eigenvalues are
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. Cylindrical pins of 
mm diameter are electroplated in a shop. Thickness of
the plating is 30+2.0 micron. Neglecting gage tolerances, the size of the GO gage
in mm to inspect the plated components is
mm diameter are electroplated in a shop. Thickness of
the plating is 30+2.0 micron. Neglecting gage tolerances, the size of the GO gage
in mm to inspect the plated components is
Answer : Option B
Explaination / Solution:
Go gauge = max. Limit = 25.052
