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Can you ace these NDDC Scholarship Mechanical Engineering Aptitude Test questions? Start honing your skills with some past questions practice and get a preview of what you can expect on test day.

We pulled these Mechanical Engineering questions from our study pack NDDC Scholarship aptitude-test past questions studypack. Each sample question includes correct answers, so you can see how to crack it!

Note about the test format: On the NDDC Scholarship aptitude test you’ll face 4 test sections: Mathematics, English language, General knowledge, and the Skill test section (Mechanical Engineering based questions).

Sample NDDC Scholarship Mechanical Engineering Aptitude Test Past Questions and answers

1. A piston/cylinder with a cross-sectional area of 0.01 m^2 is resting on the stops. With an outside pressure of 100 kPa, what should be the water pressure to lift the piston?
A. 178kPa
B. 188kPa
C. 198kPa
D. 208kPa

See the answer

The correct answer is C.

Explanation:
Pw = Po + mg/A = 100000 + (100*9.8/0.01) = 198kPa.

2. Equation of continuity comes from
A. Conservation of energy
B. Conservation of mass
C. Conservation of work
D. Conservation of heat

See the answer

The correct answer is B.

Explanation:
w1=w2 i.e., we get (AV/v)1=(AV/v)2 and this is called equation of continuity(where w1 & w2 are mass flow rates).

3. In a flow process, the work transfer may be of which type?
A. External work
B. Flow work
C. all of the mentioned
D. None of the mentioned

See the answer

The correct answer is C.

Explanation:
Flow work is the displacement work and external work mostly comprises of shaft work.

4. The total rate of flow of all energy streams entering the control volume must equal to that of leaving the control volume.
A. true
B. false

See the answer

The correct answer is A.

Explanation:
Given statement is true by the conservation of energy.

5. Find the rate of conduction heat transfer through a 1.5 cm thick board (k = 0.16 W/m K), with a temperature difference of 20°C between the two sides.
A. 113 W/m2
B. 413 W/m2
C. 313 W/m2
D. 213 W/m2

See the answer

The correct answer is C.

Explanation:
The rate of conduction heat transfer = k(ΔT/Δx) = (0.16 *20)/0.015 = 213 W/m2.

Click here to get the complete NDDC Scholarship past questions pack for Mechanical Engineering category

6. From the concept of kinetic theory, mean travel velocity of the gas molecules is prescribed by the relation
A. V = (3M/GT) 1/2
B. V = (3GT/M) 1/2
C. V = (6T/GM) 1/2
D. V = (3GT/2M) 1/2
Where,
G = Universal gas constant
M = Molecular weight of the gas
T = Absolute temperature

See the answer

The correct answer is B.

Explanation:
Heat transfer by conduction in gases occurs through transport of the kinetic energy of molecular motion resulting from the random movement and collisions of the molecules.

7. With variable thermal conductivity, Fourier law of heat conduction through a plane wall can be expressed as
A. Q = -k0 (1 + β t) A d t/d x
B. Q = k0 (1 + β t) A d t/d x
C. Q = – (1 + β t) A d t/d x
D. Q = (1 + β t) A d t/d x

See the answer

The correct answer is A.

Explanation:
Here k0 is thermal conductivity at zero degree Celsius.

8. The specific heat of a substance at constant volume is defined as the rate of change of ___ with respect to ___
A. specific internal energy, temperature
B. work, pressure
C. specific internal energy, pressure
D. heat, temperature

See the answer

The correct answer is A.

Explanation:
cv=∂u/∂T at constant volume

9. Heat transferred at constant _____ increases the _____ of a system.
A. pressure, increases
B. volume, increases
C. both of the mentioned
D. none of the mentioned

See the answer

The correct answer is C.

Explanation:
At constant pressure, (dQ)=dh and at constant volume, Q=Δu.

10. Pattern cannot be constructed out of which of the following materials?
A. Wood
B. Wax
C. Oil
D. Metal

See the answer

The correct answer is C.

Explanation:
Oil is used as fuels for melting metals in various furnaces. It cannot be used for constructing a pattern, while all other materials are used for making patterns.

Want to guarantee success? Practice with our full NDDC Scholarship study pack, with even more questions, answers and explanations.

Sample NDDC Scholarship Mechanical Engineering Aptitude Test Past Questions and answers

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