carbon dioxide
sulphur dioxide
lithium bromide
R-12
✅ The correct answer is option C.
Mechanical Engineering MCQs
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.
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.
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.
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.
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.
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.
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.
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.
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.