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Home » Engineering » Aptitude Test - 129
Hassan
1.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
2.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
3.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
4.The gas constant (R) is equal to the ____ of two specific heats.
A. sum
B. difference
C. product
D. sum
5.Otto cycle is also known as
A. constant pressure cycle
B. constant volume cycle
C. constant temperature cycle
D. constant pressure cycle
6.Producer gas is obtained by
A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
B. carbonisation of bituminous coal
C. passing steam over incandescent coke
D. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
7.The efficiency of Diesel cycle depends upon
A. temperature limits
B. pressure ratio
C. compression ratio
D. temperature limits
8.Those substances which have so far not been resolved by any means into other substances of simpler form are called
A. elements
B. compounds
C. atoms
D. elements
9.The measurement of a thermodynamic property known as temperature is based on
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Zeroth law of thermodynamics
10.For the same compression ratio, the efficiency of dual combustion cycle is
A. greater than Diesel cycle and less than Otto cycle
B. less than Diesel cycle and greater than Otto cycle
C. greater than Diesel cycle
D. greater than Diesel cycle and less than Otto cycle
11.In an irreversible process, there is a
A. loss of heat
B. no loss of heat
C. gain of heat
D. loss of heat
12.Coke is produced
A. when coal is first dried and then crushed to a fine powder by pulverising machine
B. from the finely ground coal by moulding under pressure with or without a binding material
C. when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
D. when coal is first dried and then crushed to a fine powder by pulverising machine
13.One Joule (J) is equal to
A. 1 N-m
B. 1 kN-m
C. 10 N-m/s
D. 1 N-m
14.When the expansion or compression takes place according to the law pvn = C, the process is known as
A. isothermal process
B. adiabatic process
C. hyperbolic process
D. isothermal process
15.The state of a substance whose evaporation from its liquid state is complete, is known as
A. vapour
B. perfect gas
C. air
D. vapour
16.The volumetric or molar specific heat at constant pressure is the product of
A. molecular mass of the gas and the specific heat at constant volume
B. atomic mass of the gas and the gas constant
C. molecular mass of the gas and the gas constant
D. molecular mass of the gas and the specific heat at constant volume
17.The efficiency of Carnot cycle depends upon
A. temperature limits
B. pressure ratio
C. volume compression ratio
D. temperature limits
18.The gas turbine cycle with regenerator improves
A. thermal efficiency
B. work ratio
C. avoids pollution
D. thermal efficiency
19.Which of the following has the highest calorific value?
A. Peat
B. Lignite
C. Bituminous coal
D. Peat
20.When a gas is heated, change takes place in
A. pressure
B. volume
C. temperature
D. pressure
21.Which of the following is an intensive property of a thermodynamic system?
A. Volume
B. Temperature
C. Mass
D. Volume
22.A triatomic molecule consists of __________ atoms.
A. one
B. two
C. three
D. one
23.The main cause for the irreversibility is
A. mechanical and fluid friction
B. unrestricted expansion
C. heat transfer with a finite temperature difference
D. mechanical and fluid friction
24.A cycle consisting of _____ and two isothermal processes is known as Stirling cycle.
A. two constant pressure
B. two constant volume
C. two isentropic
D. two constant pressure
25.The heat and mechanical energies are mutually convertible. This statement was established by
A. Boyle
B. Charles
C. Joule
D. Boyle
26.For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.
A. greater than
B. less than
C. equal to
D. greater than
27.Mond gas is obtained by
A. partial combusion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
B. carbonisation of bituminous coal
C. passing steam over incandescent coke
D. partial combusion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
28.The natural solid fuel is
A. wood
B. coke
C. anthracite coal
D. wood
29.The condition for the reversibility of a cycle is
A. the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
B. all the processes, taking place in the cycle of operation, must be extremely slow
C. the working parts of the engine must be friction free
D. the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
30.In open cycle gas turbine plants
A. the indirect heat exchanger and cooler is avoided
B. direct combustion system is used
C. a condenser is used
D. the indirect heat exchanger and cooler is avoided
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