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Home » Engineering » Mechanical Engineering » Aptitude Test - 20
1.In a free expansion process,
A. W1 - 2 = 0
B. Q1 - 2 = 0
C. dU = 0
D. W1 - 2 = 0
2.The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)
A. pv = mRT
B. pv = RTm
C. pvm = C
D. pv = mRT
3.The work ratio of simple gas turbine cycle depends upon
A. maximum cycle temperature
B. minimum cycle temperature
C. pressure ratio
D. maximum cycle temperature
4.The gas constant (R) is equal to the
A. sum of two specific heats
B. difference of two specific heats
C. product of two specific heats
D. sum of two specific heats
5.Select the wrong statement
A. A Joule cycle consists of two constant volume and two isentropic processes.
B. An Otto cycle consists of two constant volume and two isentropic processes.
C. An Ericsson cycle consists of two constant pressure and two isothermal processes.
D. A Joule cycle consists of two constant volume and two isentropic processes.
6.One kg of hydrogen requires 8 kg of oxygen and produces
A. 1 kg of water
B. 7 kg of water
C. 8 kg of water
D. 1 kg of water
7.The standard value of atmospheric pressure taken at sea level is
A. 1.013 bar
B. 760 mm of Hg
C. 1013 x 102 N/m2
D. 1.013 bar
8.The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as
A. element
B. compound
C. atom
D. element
9.The absolute zero pressure can be attained at a temperature of
A. 0°C
B. 273°C
C. 273 K
D. 0°C
10.One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and ____ kg of water or steam.
A. 7-Sep
B. 7-Nov
C. 4-Jul
D. 7-Sep
11.One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to
A. 800K
B. 1000K
C. 1200K
D. 800K
12.When the gas is heated at constant volume, the heat supplied
A. increases the internal energy of the gas and increases the temperature of the gas
B. does some external work during expansion
C. Both (A) and (B)
D. increases the internal energy of the gas and increases the temperature of the gas
13.In closed cycle gas turbine, the air is compressed
A. isothermally
B. isentropically
C. polytropically
D. isothermally
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