Description : Refrigerants commonly used for domestic refrigerators are (A) Ethyl chloride or methyl chloride (B) Freon-12 (C) Propane (D) NH3 or CO2
Last Answer : (A) Ethyl chloride or methyl chloride
Description : The freon group of refrigerants are (a) halo-carbon refrigerants (b) azeotrope refrigerants (c) inorganic refrigerants (d) hydro-carbon refrigerants
Last Answer : Ans: a
Description : Freon group of refrigerants are (a) inflammable (d) toxic (c) non-toxic and non-inflammable (d) non-toxic and inflammable
Last Answer : Ans: c
Description : Refrigeration in aeroplanes usually employs the following refrigerant (a) Co2 (b) Freon-11 (c) Freon-22 (d) Air
Last Answer : Ans: d
Description : Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the orderof (a) 1 : 1 (b) 1 : 9 (c) 9 : 1 (d) 1 : 3
Last Answer : Ans: b
Description : Moisture in freon refrigeration system causes (a) ineffective refrigeration (b) high power consumption (c) freezing automatic regulating valve (d) corrosion of whole system
Description : Absorption system normally uses the following refrigerant (a) Freon-11 (b) Freon-22 (c) C02 (d) ammonia.
Last Answer : Ans: e
Description : ‘Freon' used as refrigerants is chemically known as - (1) chlorinated hydrocarbon (2) fluorinated hydrocarbon (3) chlorofluoro hydrocarbon (4) fluorinated aromatic compound
Last Answer : (3) chlorofluoro hydrocarbon Explanation: In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds.
Description : Freon group of refrigerants are n. a) Inflammable. c) Non-inflammable and toxic o. b) Toxic. d) Nontoxic and non-inflammable
Last Answer : Nontoxic and non-inflammable
Description : The leaks in a refrigeration system using Freon are detected by (a) halide torch which on detection produces greenish flame lighting (b) sulphur sticks which on detection gives white smoke (c) using reagents (d) sensing reduction in pressure.
Description : A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure ofabout 67 kg/cm. The refrigerant used is (a) Ammonia (b) Carbon dioxide (c) Freon (d) Brine
Description : In vapour compression cycle using NH3 as refrigerant, initial charge is filled at (a) suction of compressor (b) delivery of compressor (c) high pressure side close to receiver (d) low pressure side near receiver
Description : Condensing temperature in a refrigerator is the temperature (a) of cooling medium (b) of freezing zone (c) of evaporator (d) at which refrigerant gas becomes liquid
Description : The general rule for rating refrigeration systems (excepting for CO2 system) is to approximate following h.p. per ton of Refrigeration (a) 0.1 to 0.5 h.p. per ton of refrigeration (b) 0.5 to 0.8 h.p. per ... (c) 1 to 2 h.p. per ton of refrigeration (d) 2 to 5 h.p. per ton of refrigeration
Description : In a petrol engine, which of the following gas gets exhausted out without burning and without transformation? a. CO2 b. CO c. O2 d. N2
Last Answer : ANSWER d. N2
Description : The compression ratio in a Spark Ignition (SI) engine is generally in between a. 7 to 10 b. 10 to 14 c. 14 to 18 d. 18 to 22 (Ans:a)
Last Answer : Which of the following is not true for two stroke engine as compared to four stroke engine? a. Less cooling is required b. Greater lubrication is required c. More uniform torque on crankshaft d. Complete exhaust of products of combustion (Ans:a)
Description : Where does the lowest temperature occur in a vapour compression cycle ? (a) condenser (b) evaporator (c) compressor (d) expansion valve
Description : The capacity of the compressor will be highest when its intake temperature is A. Lowest B. highest C. Atmospheric D. Unpredictable
Last Answer : ANSWER : C
Description : A engine will generate maximum torque when it a. runs at maximum speed b. develops maximum power c. runs at lowest speed d. consumes more fuel
Last Answer : ANSWER c. runs at lowest speed
Description : 1. Where did India play its 1st one day international match? 2. Which is the largest Public Sector Bank in India? 3. If CO2 concentration in the blood increases, what will breathing? 4. If ... Which type of coal represents the first stage of formation of coal? 20. Which Sikh Guru fought Mughals?
Last Answer : Answer : 1. Headingley 2. State Bank of India 3. Increase 4. Frost point 5. In Stupa 6. By the test of reasonableness 7. 6500 k 8. Badminton 9. Zonda 10. Kalidasa 11. 1948 12. Liver 13. 1959 14. Foehn 15. Karpurmanjari 16. Zinc 17. RBI 18. Gonds 19. Peat 20. Guru Gobind Singh
Description : One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice (a) in 1 hour (b) in 1 minute (c) in 24 hours (d) in 12 hours
Description : Air fuel ratio at which a petrol engine cannot work is A. 8:1 B. 12:1 C. 15:1 D. 20:1 and less
Last Answer : ANSWER : D
Description : The sparking voltage of the spark plug is A. 6 to 12 V B. 100 to 450 V C. 1 to 2 kV D. 20 to 30kV
Description : The stoichiometric air fuel ration for petrol is 15:1 . What is the air fuel ratio required for maximum power? (a) 16:1 – 18:1 (b) 15:1 (c) 12:1 – 14:1 (d) 9:1 – 11:1
Last Answer : Ans :c
Description : The theoretically correct air fuel ratio for petrol engine is of the order of a.6 : 1 b. 9 : 1 c. 12 : 1 d. 15 : 1
Last Answer : Answer d. 15:1
Description : CO2 is passed into concentrated solution of NaCl, which is saturated with NH3.
Last Answer : Write balanced chemical equations : CO2 is passed into concentrated solution of NaCl, which is saturated with NH3.
Description : Biotin is required for the reaction of CO2 with (A) Water (B) Acetyl CoA (C) NH3 (D) Incorporation of carbon 6 in purine
Last Answer : Answer : B
Description : Along with CO2, NH3 and ATP, the amino acid that is needed in urea cycle is (A) Alanine (B) Isoleucine (C) Aspartate (D) Glycine
Last Answer : Answer : C
Description : Which will be adsorbed more readily on the surface of charcoal and why NH3 or CO2?
Last Answer : Ans: The critical temperature NH3 is more CO2, therefore NH3 is liquefied more easily than CO2. Hence NH3 has higher intermolecular forces of attraction and hence it adsorbed more readily.
Description : Acid rains are produced by (a) excess NO2 and SO2 from burning fossil fuels (b) excess production of NH3 by industry and coal gas (c) excess release of carbon monoxide by incomplete combustion (d) excess formation of CO2 by combustion and animal respiration.
Last Answer : (a) excess NO2 and SO2 from burning fossil fuels
Description : Acid rains are due to which of the following gases? (a) CO2 and CO (b) Ozone and CO2(c) NO2 and SO2 (d) NH3 and CO2
Last Answer : (c) NO2 and SO2
Description : Which gas is released from paddy fields? a) CO2 b) H2S c) CH4 d) NH3
Last Answer : c) CH4
Description : Coke oven gas burns with a yellowish flame, because of the presence of (A) CO2 (B) CH4 (C) H2 (D) NH3
Last Answer : (B) CH4
Description : Raw materials for urea production are (A) CO2 and N2 (B) CO2 , H2 and N2 (C) NH3 and CO (D) HNO3 and CaCO3
Last Answer : (B) CO2 , H2 and N2
Description : Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an __________ reaction. (A) Catalytic (B) Exothermic (C) Endothermic (D) Reversible
Last Answer : (B) Exothermic
Description : Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total ... (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)
Last Answer : (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate
Description : Raw materials required for the production of CAN (Calcium ammonium nitrate) is NH3 (A) HNO3 & limestone (B) CO2 & H2SO4 (C) HNO3 & NH4Cl (D) CO2 & KNO3
Last Answer : (A) HNO3 & limestone
Description : Urea is represented as (A) NH2 .CO.NH2 (B) NH3CO.CH3 (C) NH.CO2 .NH (D) NH3 .CO2 .NH3
Last Answer : (A) NH2 .CO.NH2
Description : An increase in the NH3 /CO2 ratio in urea manufacture results in (A) Increased degree of conversion of CO2 to urea (B) Decreased degree of conversion of NH3 to urea (C) Decreased yield of urea (D) Decreased specific volume of molten mass
Last Answer : (A) Increased degree of conversion of CO2 to urea
Description : __________ catalyst is used in the production of urea from CO2 and NH3 . (A) Vanadium pentoxide (B) No (C) Alumina (D) Nicke
Last Answer : (B) No
Description : Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for (A) Conversion of CO into CO2 in the second compartment (B) Conversion of NOx into N2 and NH3 in the first ... of unburnt hydrocarbon fuel in the second compartment (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : . Shift conversion reaction (A) Converts N2 and H2 into NH3 (B) Converts CO to CO2 with steam (C) Is non-catalytic (D) Is highly exothermic
Last Answer : (B) Converts CO to CO2 with steam
Description : Digestion of proteins involves (a) changes in secondary structure only (b) cleavage of peptide linkages (c) removal of all carboxyl groups in the form of CO2. (d) removal of all NH2 groups in the form of NH3
Last Answer : cleavage of peptide linkages
Description : Impurities present in brine is normally removed by treatment with (A) NH3 and CO2 (B) Lime and soda ash (C) Lime, ammonia and carbon (D) All (A), (B) and (C)
Description : Which of the following molecules does NOT have a dipole moment of zero? w) BeCl2 x) BF3 y) CO2 z) NH3
Last Answer : ANSWER: Z -- NH3
Description : In the ammonia synthesis reaction, N2 + 3H2 ⇌ 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by (A) High temperature (B) Low pressure (C) Low temperature only (D) Both low temperature and high pressure
Last Answer : (D) Both low temperature and high pressure
Description : Choose the correct statement (a) A refrigerant should have low latent heat (b) If operating temperature of system is low, then refrigerant with low boiling point should be used (c) Pre-cooling and sub-cooling bf refrigerant are same (d) Superheat and sensible heat of a. refrigerant are same
Description : Which of the following is not a desirable property of a refrigerant (a) highmisibility with oil (b) low boiling point (c) good electrical conductor (d) large latent heat