A. Δ G° = 0 , Δ H° = 0
B. Δ H° = 0 , Δ S° = 0
C. Δ S° = 0 , Δ E° = 0
D. Δ S° = 0 , Δ Cp° = 0
✅ The correct answer is option C.
Engineering MCQs
Steam condenser tubes are made of ad-mirability brass, in which percentage of zinc & copper are __________ respectively.
A. 70 & 30
B. 30 & 70
C. 50 & 50
D. 90 & 10
✅ The correct answer is option A.
In TIG welding, thoriated tungsten electrodes are used, because it
A. Has higher current carraying capacity
B. Has better electron emissivity
C. Is stronger than ordinary tungsten
D. Is easy to prepare
✅ The correct answer is option B.
Use of water as a manometric liquid suffers from the disadvantage of its
A. Low vapour pressure
B. Corrosive nature
C. High vapour pressure
D. High boiling point
✅ The correct answer is option C.
An example of unsteady non uniform flow is the flow of liquid under pressure through a
A. Tapering pipe at constant flow rate
B. Tapering pipe at either decreasing or increasing flow rate
C. Long pipeline of constant diameter
D. None of these
✅ The correct answer is option B.
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10⁻¹6⁶ m² . S⁻¹ and it is 1.94 x 10⁻¹⁴ m² S⁻¹ at 1200 K. The activation energy (in k. J.mole⁻¹ ) for the diffusion of Ni in Cu is
A. 130
B. 180
C. 230
D. 250
✅ The correct answer is option C.
Lubrication is done to control
A. Friction
B. Wear
C. Temperature
D. All of the above
✅ The correct answer is option D.
The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.
A. 0.2
B. 0.4
C. 0.6
D. 0.8
✅ The correct answer is option A.
Cementite is in the lamellar form in the __________ phase of steel.
A. Martensitic
B. Bainitic
C. Pearlitic
D. Ferritic
✅ The correct answer is option C.
The phenomenon of weld decay is found in case of
A. Gun metal
B. Brass
C. Stainless steel
D. Cast iron
✅ The correct answer is option D.