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Home » Engineering » Mechanical Engineering » Aptitude Test - 17
1.Which of the following gas is mostly used in town for street and domestic lighting and heating?
A. Producer gas
B. Coal gas
C. Mond gas
D. Producer gas
2.The value of gas constant (R) in S. I. units is
A. 0.287 J/kgK
B. 2.87 J/kgK
C. 28.7 J/kgK
D. 0.287 J/kgK
3.The efficiency of Diesel cycle increases with
A. decrease in cut-off
B. increase in cut-off
C. constant cut-off
D. decrease in cut-off
4.One kg of carbon monoxide requires ____ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
A. All
B. 7-Apr
C. 4-Nov
D. All
5.The absolute zero temperature is taken as
A. -273°C
B. 273°C
C. 237°F
D. -273°C
6.The specific heat of water is
A. 1.817
B. 2512
C. 4.187
D. 1.817
7.Stirling and Ericsson cycles are
A. reversible cycles
B. irreversible cycles
C. semi-reversible cycles
D. reversible cycles
8.When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
A. zero
B. 5-Jan
C. 5-Apr
D. zero
9.A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as
A. reversible cycle
B. irreversible cycle
C. thermodynamic cycle
D. reversible cycle
10.The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
A. workdone
B. entropy
C. enthalpy
D. workdone
11.The value of 1 mm of Hg is equal to
A. 1.333 N/m2
B. 13.33 N/m2
C. 133.3 N/m2
D. 1.333 N/m2
12.One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.
A. 3-Aug
B. 3-Nov
C. 7-Nov
D. 3-Aug
13.A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
A. isothermal process
B. hyperbolic process
C. adiabatic process
D. isothermal process
14.Which of the following gas has a minimum molecular mass?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Oxygen
15.The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as
A. law of equipartition of energy
B. law of conservation of energy
C. law of degradation of energy
D. law of equipartition of energy
16.The fuel mostly used in steam boilers is
A. brown coal
B. peat
C. coking bituminous coal
D. brown coal
17.The efficiency of Joule cycle is
A. greater than Carnot cycle
B. less than Carnot cycle
C. equal to Carnot cycle
D. greater than Carnot cycle
18.The hyperbolic pocess is governed by
A. Boyle‘s law
B. Charles‘ law
C. Gay-Lussac law
D. Boyle‘s law
19.The entropy of water at 0°C is assumed to be
A. 1
B. 0
C. -1
D. 1
20.During which of the following process does heat rejection takes place in Carnot cycle?
A. Isothermal expansion
B. Isentropic expansion
C. Isothermal compression
D. Isothermal expansion
21.Which is the incorrect statement about Carnot cycle?
A. It is used as the alternate standard of comparison of all heat engines.
B. All the heat engines are based on Carnot cycle.
C. It provides concept of maximising work output between the two temperature limits.
D. It is used as the alternate standard of comparison of all heat engines.
22.The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents
A. heat absorbed
B. heat rejected
C. either (a) or (b)
D. heat absorbed
23.One kg of carbon produces ____ kg of carbon dioxide.
A. 7-Mar
B. 3-Jul
C. 3-Nov
D. 7-Mar
24.The heat supplied to the gaS at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)
A. mR(T2 - T1)
B. mcv(T2 - T1)
C. mcp(T2 - T1)
D. mR(T2 - T1)
25.The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)
A. Q1 - 2 = dU + W1 - 2
B. Q1 - 2 = dU - W1 - 2
C. Q1 - 2 = dU/W1 - 2
D. Q1 - 2 = dU + W1 - 2
26.The compression ratio for Diesel engines is
A. 3 to 6
B. 5 to 8
C. 15 to 20
D. 3 to 6
27.In an isothermal process,
A. there is no change in temperature
B. there is no change in enthalpy
C. there is no change in internal energy
D. there is no change in temperature
28.Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A. combustion is at constant volume
B. expansion and compression are isentropic
C. maximum temperature is higher
D. combustion is at constant volume
29.A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
A. 30 kJ
B. 54 kJ
C. 84 kJ
D. 30 kJ
30.The gas constant (R) is equal to the ____ of two specific heats.
A. sum
B. difference
C. product
D. sum
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