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Home » Engineering » Aptitude Test - 127
Hassan
1.Stage efficiency is also known as
A. diagram efficiency
B. nozzle efficiency
C. gross efficiency
D. diagram efficiency
2.In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is
A. low
B. very low
C. high
D. low
3.In an impulse reaction turbine, the pressure drops gradually and continuously over
A. fixed blades
B. moving blades
C. both fixed and moving blades
D. fixed blades
4.When the inlet pressure of steam is equal to the exit pressure, then
A. there is a pressure drop in the nozzle
B. fluid flows through the nozzle
C. pressure drops and fluid flows through the nozzle
D. there is a pressure drop in the nozzle
5.The blade friction in the impulse turbine reduces the velocity of steam by ____ while it passes over the blades.
A. 10 to 15%
B. 15 to 20%
C. 20 to 30%
D. 10 to 15%
6.The effect of bleeding is that
A. it increases the thermodynamic efficiency of the turbine
B. boiler is supplied with hot water
C. it decreases the power developed by the turbine
D. it increases the thermodynamic efficiency of the turbine
7.The expansion of steam, as it flows over the blades in reaction turbine, represents
A. isothermal process
B. isentropic process
C. throttling process
D. isothermal process
8.The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and ? = Nozzle angle)
A. Vb = 0.5 V cos ?
B. Vb = V cos ?
C. Vb = 0.5 V2 cos ?
D. Vb = 0.5 V cos ?
9.The velocity of whirl at outlet for an axial discharge turbine is
A. minimum
B. maximum
C. zero
D. minimum
10.In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is ____ the relative velocity of steam at inlet tip of the blade.
A. equal to
B. less than
C. greater than
D. equal to
11.The friction present between the steam and the nozzle surfaces reduces the heat drop by
A. 10 to 15 percent
B. 15 to 25 percent
C. 25 to 40 percent
D. 10 to 15 percent
12.An impulse turbine as compared to a reaction turbine, for a given power has ___row of blades.
A. equal
B. less
C. more
D. equal
13.Degree of reaction is defined as the ratio of
A. heat drop in fixed blades to the heat drop in moving blades
B. heat drop in moving blades to the heat drop in fixed blades
C. heat drop in moving blades to the heat drop in fixed blades plus heat drop in moving blades
D. heat drop in fixed blades to the heat drop in moving blades
14.The expansion of steam in a nozzle follows
A. Carnot cycle
B. Rankine cycle
C. Joule cycle
D. Carnot cycle
15.A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
A. Carnot cycle
B. Stirling cycle
C. Otto cycle
D. Carnot cycle
16.The efficiency and work ratio of a simple gas turbine cycle are
A. low
B. very low
C. high
D. low
17.The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
A. specific heat at constant volume
B. specific heat at constant pressure
C. kilo Joule
D. specific heat at constant volume
18.An adiabatic process is one in which
A. no heat enters or leaves the gas
B. the temperature of the gas changes
C. the change in internal energy is equal to the mechanical workdone
D. no heat enters or leaves the gas
19.Which of the following is the lightest and most volatile liquid fuel?
A. Gasoline
B. Kerosene
C. Fuel oil
D. Gasoline
20.The processes occurring in open system which permit the transfer of mass to and from the system, are known as
A. flow processes
B. non-flow processes
C. adiabatic processes
D. flow processes
21.Which of the following has the minimum atomic mass?
A. Oxygen
B. Sulphur
C. Nitrogen
D. Oxygen
22.Workdone in a free expansion process is
A. zero
B. minimum
C. maximum
D. zero
23.The pressure exerted by an ideal gas is ____ of the kinetic energy of all the molecules contained in a unit volume of gas.
A. one-half
B. one-third
C. two-third
D. one-half
24.The compression ratio for petrol engines is
A. 3 to 6
B. 5 to 8
C. 15 to 20
D. 3 to 6
25.The efficiency of Diesel cycle approaches to Otto cycle efficiency when
A. cut-off is increased
B. cut-off is decreased
C. cut-off is zero
D. cut-off is increased
26.The entropy ___ in an irreversible cyclic process.
A. remains constant
B. decreases
C. increases
D. remains constant
27.The atomic mass of oxygen is
A. 12
B. 14
C. 16
D. 12
28.The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is
A. equal to one
B. less than one
C. greater than one
D. equal to one
29.Carbonisation of coal consists of
A. drying and crushing the coal to a fine powder
B. moulding the finely ground coal under pressure with or without a binding material
C. heating the wood with a limited supply of air to temperature not less than 280°C
D. drying and crushing the coal to a fine powder
30.The efficiency of Stirling cycle is __________ Carnot cycle.
A. greater than
B. less than
C. equal to
D. greater than
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