1671. The usual value of the helix angle of a drill is
20°
30°
45°
60°
✅ 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.
1672. The directional solidification in casting can be improved by using
chills and chaplets
chills and padding
chaplets and padding
chills, chaplets and p
✅ The correct answer is option B.
1673. If a tyre is designated as 175/65 R14 82 S, then the aspect ratio for the tyre is
175
65
14
82
✅ The correct answer is option B.
1674. In order to reduce the rotor speed of an impulse turbine, the method employed is
velocity compounding
pressure compounding
pressure-velocity compounding
all of these
✅ The correct answer is option D.
1675. The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called
conduction
convection
radiation
✅ The correct answer is option B.
1676. The evaporative capacity of a boiler is defined as the evaporation of 15.653 kg of water per hour from and at 100° C.
Yes
No
✅ The correct answer is option B.
1677. Glazing in grinding wheels can be decreased by
using a harder wheel or by increasing the wheel speed
using a softer wheel or by decreasing the wheel speed
using a harder wheel or by decreasing the wheel speed
using a softer wheel o
✅ The correct answer is option B.
1678. In a shell and coil condenser, water flows in the shell and the refrigerant in the coil.
TRUE
FALSE
✅ The correct answer is option B.
1679. In a four stroke cycle diesel engine, the exhaust valve
opens at 30° before bottom dead cnetre and closes at 10° after top dead centre
opens at 30° after bottom dead centre and closes at 10° before top dead centre
opens at bottom dead centre and closes at top dead centre
may open and close any
✅ The correct answer is option A.
1680. The overall efficiency is defined as the ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time.
TRUE
FALSE
✅ The correct answer is option A.