1301. The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
carbon dioxide
sulphur dioxide
lithium bromide
R-12
✅ 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.
1302. Pearlite consists of
13% carbon and 87% ferrite
13% cementite and 87% ferrite
13% ferrite and 87% cementite
6.67% carbon and 93.33
✅ The correct answer is option B.
1303. The strength of the un-riveted or solid plate per pitch length is
d.t.σc
p.t.σt
(p – d)t.σt
π/2 x d2 x τ
✅ The correct answer is option B.
1304. Lame’s theory is associated with
thin cylindrical shells
thick cylindrical shells
direct and bending stresses
none of these
✅ The correct answer is option B.
1305. The efficiency of a square threaded screw is maximum if the helix angle is equal to (where φ = Angle of friction)
90° – φ
45° – φ
45° – φ/2
45° + φ/2
✅ The correct answer is option C.
1306. A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be
tensile
compressive
shear
zero
✅ The correct answer is option B.
1307. When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,
α = 1, ρ = 0 and τ = 0
α = 0, ρ = 1 and τ = 0
α = 0, ρ = 0 and τ = 1
α + ρ = 1 and τ = 0
✅ The correct answer is option D.
1308. When the expansion of steam is carried out in a single cylinder and then exhausted into the atmosphere or a condenser, the engine is said to be a simple steam engine.
Correct
Incorrect
✅ The correct answer is option A.
1309. The minimum force required to slide a body of weight W on a rough horizontal plane is
W sin θ
W cos θ
W tan θ
W cosec θ
✅ The correct answer is option A.
1310. The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as
completely constrained motion
incompletely constrained motion
successfully constrained motion
none of these
✅ The correct answer is option A.