Question: __________ the exhaust gas is an indication of the incomplete combustion of fuel. [A]. Low temperature of [B]. High temperature of [C]. High % of CO in [D]. High % of CO2 in Answer: Option C Explanation: No answer…

Question: A static fluid can not have [A]. zero shear stress. [B]. positive normal stress. [C]. non-zero shear stress. [D]. none of these. Answer: Option C Explanation: No answer description available for this question.

Question: Knocking tendency in a petrol engine decreases with increasing [A]. supercharging [B]. compression ratio [C]. wall temperature [D]. engine speed Answer: Option D Explanation: No answer description available for this question.

Question: Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is [A]. very low which prevents their ignition by compression. [B]. very high which prevents their ignition by compression [C]. zero. [D]. none of these.…

Question: Boiler rating is normally done in terms of [A]. steam temperature & pressure. [B]. steam output (tons/hr). [C]. heat transfer rate (kcal/hr). [D]. heat transfer area (m2). Answer: Option B Explanation: No answer description available for this question.

Question: Co-efficient of performance of a Carnot cycle refrigerator operating between – 23°C and + 27°C is [A]. 3 [B]. 5 [C]. 0.5 [D]. 1.5 Answer: Option B Explanation: No answer description available for this question.

Question: Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm. [A]. 15 [B]. 25 [C]. 10 [D]. 30…

Question: In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is [A]. less [B]. more [C]. equal [D]. unpredictable…

Question: In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that [A]. compared to the mass flow rate of cooling water, the rate of…

Question: In radiative heat transfer, a grey surface is the one, which has [A]. emissivity independent of wavelength. [B]. grey appearance to the eye. [C]. zero reflectivity. [D]. equal brightness in all directions. Answer: Option A Explanation: No answer description…