MECHANICAL ENGINEERING MCQ SECTION 26

251. Resistances can be measured with the help of

(A) wattmeters

(B) voltmeters

(C) ammeters

(D) ohm meters and resistance bridges

Answer: - ohm meters and resistance bridges

252. In the perpetual inventory control, the material is checked when it reaches its

(A) minimum value

(B) maximum value

(C) average value

(D) alarming value

Answer: - minimum value

253. Ferromagnetic alpha iron exists in temperature range of

(A) below 723°C

(B) 770 – 910°C

(C) 910 –1440°C

(D) 1400 – 1539°C

Answer: - below 723°C

254. The example of rolling pair is

(A) bolt and nut

(B) lead screw of a lathe

(C) ball and socket joint

(D) ball bearing and roller bearing

Answer: - ball bearing and roller bearing

255. The unbalanced primary forces in a reciprocating engine are

(A) balanced completely

(B) balanced partially

(C) balanced by secondary forces

(D) not balanced

Answer: - balanced partially

256. General energy equation holds for

(A) Steady flow

(B) Turbulent flow

(C) Laminar flow

(D) Non-uniform flow

Answer: - Steady flow

257. When steel containing less than 0.85% carbon is cooled slowly below the lower critical point, it contains

(A) Ferrite mainly

(B) Pearlite mainly

(C) Ferrite and pearlite

(D) Pearlite and cementite

Answer: - Ferrite and pearlite

258. Spheroidal or nodular graphite iron is designed as SG 500/7. Here ‘500’ and ‘7’ stand for

(A) Proof stress in N/mm2 and elongation in %

(B) Tensile strength in N/mm2 and impact strength in N-m

(C) Tensile strength in N/mm2 and elongation in %

(D) Tensile strength in kg.mm2 and elongation in %

Answer: - Tensile strength in N/mm2 and elongation in %

259. The most suitable pair of refrigerant and absorbent combination for solar refrigeration is

(A) ammonia and water

(B) ammonia and sodium thiocyanide

(C) water and lithium bromide

(D) R22 and dimethylformamide

Answer: - water and lithium bromide

260. The power consumed by a reciprocating air compressor will be minimum, if the compression follows the thermodynamic

(A) isentropic process

(B) adiabatic process

(C) isothermal process

(D) polytropic process

Answer: - isothermal process