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Home » Engineering » Aptitude Test - 130
Hassan
1.The compression ratio is the ratio of
A. swept volume to total volume
B. total volume to swept volume
C. swept volume to clearance volume
D. swept volume to total volume
2.The efficiency of Ericsson cycle is ____ Carnot cycle.
A. greater than
B. less than
C. equal to
D. greater than
3.One molecule of oxygen consists of _____ atoms of oxygen.
A. 2
B. 4
C. 8
D. 2
4.According to kinetic theory of gases, the velocity of molecules ____ with the increase in temperature.
A. remains constant
B. increases
C. decreases
D. remains constant
5.The hard coke is obtained when carbonization of coal is carried out at
A. 300° to 500°C
B. 500° to700°C
C. 700° to 900°C
D. 300° to 500°C
6.According to First law of thermodynamics,
A. total internal energy of a system during a process remains constant
B. total energy of a system remains constant
C. workdone by a system is equal to the heat transferred by the system
D. total internal energy of a system during a process remains constant
7.Stirling cycle consists of
A. two constant volume and two isentropic processes
B. two constant volume and two isothermal processes
C. two constant pressure and two isothermal processes
D. two constant volume and two isentropic processes
8.The ratio of molar specific heats for monoatomic gas is
A. 1
B. 1.4
C. 1.67
D. 1
9.The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to
A. 0
B. 1
C. ?
D. 0
10.Which of the following statement is wrong?
A. The closed cycle gas turbine plants are external combustion plants.
B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
D. The closed cycle gas turbine plants are external combustion plants.
11.Carnot cycle consists of
A. two constant volume and two isentropic processes
B. two isothermal and two isentropic processes
C. two constant pressure and two isentropic processes
D. two constant volume and two isentropic processes
12.When a gas is heated at constant volume
A. its temperature will increase
B. its pressure will increase
C. both temperature and pressure will increase
D. its temperature will increase
13.The value of cp/cv for air is
A. 1
B. 1.4
C. 1.8
D. 1
14.The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)
A. ?Q = T.ds
B. ?Q = T/ds
C. dQ = ds/T
D. ?Q = T.ds
15.Which of the following gas has the highest calorific value?
A. Coal gas
B. Producer gas
C. Mond gas
D. Coal gas
16.The oxygen atom is _____ times heavier than the hydrogen atom.
A. 2
B. 4
C. 8
D. 2
17.When the gas is cooled at constant pressure,
A. its temperature increases but volume decreases
B. its volume increases but temperature decreases
C. both temperature and volume increases
D. its temperature increases but volume decreases
18.The principal constituents of a fuel are
A. carbon and hydrogen
B. oxygen and hydrogen
C. sulphur and oxygen
D. carbon and hydrogen
19.In an extensive property of a thermodynamic system
A. extensive heat is transferred
B. extensive work is done
C. extensive energy is utilised
D. extensive heat is transferred
20.When a gas is heated at constant pressure
A. its temperature will increase
B. its volume will increase
C. both temperature and volume will increase
D. its temperature will increase
21.One kg of carbon monoxide requires 4/7 kg of oxygen and produces
A. 11/3 kg of carbon dioxide gas
B. 7/3 kg of carbon monoxide gas
C. 11/7 kg of carbon dioxide gas
D. 11/3 kg of carbon dioxide gas
22.The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of
A. 0.224 litres
B. 2.24 litres
C. 22.4 litres
D. 0.224 litres
23.The absolute zero pressure will be
A. when molecular momentum of the system becomes zero
B. at sea level
C. at the temperature of - 273 K
D. when molecular momentum of the system becomes zero
24.The gas in cooling chamber of a closed cycle gas turbine is cooled at
A. constant volume
B. constant temperature
C. constant pressure
D. constant volume
25.Which of the following is the correct statement?
A. For a given compression ratio both Otto and Diesel cycles have the same efficiency.
B. For a given compression ratio Otto cycle is more efficient than Diesel cycle.
C. For a given compression ratio Diesel cycle is more efficient than Otto cycle.
D. For a given compression ratio both Otto and Diesel cycles have the same efficiency.
26.The temperature at which the volume of a gas becomes zero is called
A. absolute scale of temperature
B. absolute zero temperature
C. absolute temperature
D. absolute scale of temperature
27.The heating of gas at constant volume is governed by
A. Boyles law
B. Charles law
C. Gay-Lussac law
D. Boyles law
28.The fuel mostly used in cement industry and in metallurgical processes is
A. wood charcoal
B. bituminous coke
C. pulverised coal
D. wood charcoal
29.The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always ___ one.
A. equal to
B. less than
C. greater than
D. equal to
30.The isothermal and adiabatic processes are regarded as
A. reversible process
B. irreversible process
C. reversible or irreversible process
D. reversible process
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