31. Hardness of steel is increased by adding sulphur, lead and phosphorus.
Yes
No
✅ The correct answer is option B.
Mechanical Engineering
Prepare with the best Mechanical Engineering MCQs with answers and explanations for exams, interviews, and job tests. Our collection covers core topics such as engineering mechanics, thermodynamics, strength of materials, theory of machines, fluid mechanics, heat transfer, manufacturing processes, machine design, and power plant engineering. These Mechanical Engineering multiple-choice questions are designed for students, fresh graduates, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and recruitment assessments. Strengthen your technical knowledge and problem-solving ability with our updated and comprehensive Mechanical Engineering MCQs.
32. In a planer
tool is stationary and work reciprocates
work is stationary and tool reciprocates
tool moves over stationary work
tool moves over recipr
✅ The correct answer is option A.
33. The universal gas constant (or molar constant) of a gas is the product of
molecular mass of the gas and the gas constant
atomic mass of the gas and the gas constant
molecular mass of the gas and the specific heat at constant pressure
molecular mass of the
✅ The correct answer is option A.
34. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?
The pressure on the wall at the liquid level is minimum.
The pressure on the bottom of the wall is maximum.
The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
The pressure on the bo
✅ The correct answer is option C.
36. Babcock and Wilcox boiler is a stationary type of water tube boiler.
Correct
Incorrect
✅ The correct answer is option A.
37. In a four bar chain or quadric cycle chain
each of the four pairs is a turning pair
one is a turning pair and three are sliding pairs
two are turning pairs and two are sliding pairs
three are turning pair
✅ The correct answer is option A.
38. The power developed by a turbine is (where H = Head of water under which the turbine is working)
directly proportional to H1/2
inversely proportional to H1/2
directly proportional to H3/2
inversely proportional
✅ The correct answer is option C.
40. Which of the following does not relate to a spark ignition engine ?
Ignition coil
Spar kplug
Carburettor
Fuel injector
✅ The correct answer is option D.