4071. Prandtl number (PN) is given by PN = μ.cp/k.
Yes
No
✅ The correct answer is option A.
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.
4072. A casting defect which results in general enlargement of a casting is known as
shift
sand wash
swell
scab
✅ The correct answer is option C.
4073. Bulk modulus of a fluid __________ as the pressure increases.
remains same
decreases
increases
✅ The correct answer is option C.
4074. Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?
Woodruff key
Feather key
Gib-head key
Tangent key
✅ The correct answer is option D.
4075. The pull required to shear off a rivet, in double shear, per pitch length is
π/4 x d2 x σt
π/4 x d2 x τ
π/2 x d2 x σt
π/2 x d2 x τ
✅ The correct answer is option D.
4076. The heat balance sheet for the boiler shows the
complete account of heat supplied by 1 kg of dry fuel and the heat consumed
moisture present in the fuel
steam formed by combustion of hygrogen per kg of fuel
all of the above
✅ The correct answer is option A.
4077. A single point tool has
rake angle
cutting angle
lip angle
all of these
✅ The correct answer is option D.
4078. The sparking in a petrol engine increases pressure and temperature of the products of combustion, but the volume remains constant.
Yes
No
✅ The correct answer is option A.
4079. A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is
1 kN-m
2 kN-m
3 kN-m
4 kN-m
✅ The correct answer is option C.
4080. When a body is subjected to a direct tensile stress (σ), the maximum normal stress is equal to the direct tensile stress.
Agree
Disagree
✅ The correct answer is option A.