Mechanical Engineering - Online Test
Q1. Which one among the following welding processes uses non-consumable
electrode?
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. 
evaluated anticlockwise around the circle |z - i| = 2, where i = √-1, is
evaluated anticlockwise around the circle |z - i| = 2, where i = √-1, is
Answer : Option A
Explaination / Solution:
No Explaination.
Q3. A simply supported beam PQ is loaded by a moment of 1kN-m at the mid-span of
the beam as shown in the figure. The reaction forces RP and RQ at supports P
and Q respectively are
Answer : Option A
Explaination / Solution:
Take moments about ‘Q’
Q4. The contents of a well-insulated tank are heated by a resistor of 23Ω in which
10A current is flowing. Consider the tank along with its contents as a
thermodynamic system. The work done by the system and the heat transfer to
the system are positive. The rates of heat (Q), work (W) and change in internal
energy (∆U) during the process in kW are
Answer : Option A
Explaination / Solution:
Q5. The crystal structure of austenite is
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. Figure shows the schematic for the measurement of velocity of air (density =
1.2kg /m3 ) through a constant–area duct using a pitot tube and a water-tube
manometer. The differential head of water (density = 1000 kg /m3) in the two
columns of the manometer is 10mm. Take acceleration due to gravity as 9.8m / s2. The velocity of air in m/s is
Answer : Option C
Explaination / Solution:
From Bernoulli’s equation
Q7. A matrix has eigenvalues –1 and –2. The corresponding eigenvectors are 
respectively. The matrix is
respectively. The matrix is
Answer : Option D
Explaination / Solution:
No Explaination.
Q8. A double – parallelogram mechanism is shown in the figure. Note that PQ is a
single link. The mobility of the mechanism is
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. The values of enthalpy of steam at the inlet and outlet of a steam turbine in a
Rankine cycle are 2800kJ/kg and 1800kJ/kg respectively. Neglecting pump work,
the specific steam consumption in kg/kW-hour is
Answer : Option A
Explaination / Solution:
Work done by the turbine
W = 2800 – 1800 = 1000 kJ/kg = 1000 kW-s/kg
Specific fuel consumption = (1/1000)×3600 = 3.6 kg / kw-hr
Q10. Match the following non-traditional machining processes with the corresponding
material removal mechanisms :
Machining process Mechanism of material removal
P. Chemical machining 1. Erosion
Q. Electro-chemical machining 2. Corrosive reaction
R. Electro – discharge machining 3. Ion displacement
S. Ultrasonic machining 4. Fusion and vaporization
Answer : Option A
Explaination / Solution:
No Explaination.
