1971. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
dry bulb temperature
wet bulb temperature
dew point temperature
specific humidity
✅ The correct answer is option C.
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.
1972. The discharged lead-acid battery has on its plates
lead peroxide (PbO2)
spongy lead (Pb)
lead sulphate (PbSO4)
sulphuric acid (H2SO4)
✅ The correct answer is option C.
1973. A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
length of both the pipes is same
diameter of both the pipes is same
loss of head and discharge of both the pipes is same
loss of head and veloc
✅ The correct answer is option C.
1974. The addendum is the radial distance of tooth from the pitch circle to the top of the tooth.
Agree
Disagree
✅ The correct answer is option A.
1975. Toe-in ensures parallel rolling of the wheel thus stabilizing steering in addition to preventing both sides slipping and excessive tyre wear.
Correct
Incorrect
✅ The correct answer is option A.
1976. In Meyer’s expansion valve, the main valve is driven by an eccentric having an angle of advance from
10° – 15°
15° – 25°
25° – 30°
30° – 40°
✅ The correct answer is option C.
1977. Wahl’s stress factor __________ very rapidly as the spring index decreases.
increases
decreases
✅ The correct answer is option A.
1978. For longitudinal joint in boilers, the type of joint used is
butt joint with single cover plate
butt joint with double cover plate
lap joint with one ring overlapping the other
any one of the above
✅ The correct answer is option B.
1979. The efficiency of Diesel cycle increases with increase in cut-off.
Yes
No
✅ The correct answer is option B.
1980. A steam nozzle converts
heat energy of steam into kinetic energy
kinetic energy into heat energy of steam
heat energy of steam into potential energy
potential energy into
✅ The correct answer is option A.