The ratio of the actual mass flow rate to that due to isentropic expansion in the steam nozzle is known as
Mach number
Coefficient of discharge
Nozzle efficiency
Critical pressure ratio
b
1
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2
Which of the following types of simple manometers measures the gauge pressure of only incompressible fluids?
Single column manometer
U – tube manometer
Differential U – tube manometer
Piezometer
d
1
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3
If the lower temperature fixed by the refrigeration application is high, the C.O.P. of the Carnot refrigerator will be
very Less
High
Same
Less
b
1
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4
. Which of the following is the advantage of axial flow pump?
High volumetric discharge
Low volumetric discharge
High head
Medium discharge pressure
a
1
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5
The function of an air pre heater is
To increase the temperature of air before entering the furnace
To decrease the temperature of air after entering the furnace
To increase the temperature of air after entering the furnace
To decrease the temperature of air before entering the furnace
a
1
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6
. If 5 litres of a certain oil weighs 30 N, then what will be the specific weight of that oil?
600 N/m3
300 N/m3
6000 N/m3
3000 N/m3
c
1
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7
If the manometeric efficiency and mechanical efficiency of a centrifugal pump are 70% and 80%, respectively, then the overall efficiency will be:
80%
40%
56%
75%
b
1
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8
Which of the following statements about equilibrium is correct?
Summation of all the forces acting in one direction must not be zero.
Summation of all the forces acting in all the possible directions must be zero.
Summation of all the forces acting in all the possible directions must be non-zero
Summation of all the forces acting in one direction must be zero.
b
1
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9
What will be the atmospheric pressure at a location where the barometric reading is 750 mm Hg and the gravitational acceleration is g = 9.81 m/s2? Assume the density of mercury to be 13,600 kg/m3
100.06 Pa
10.006 kPa
1000.6 Pa
100.06 kPa
d
1
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10
Which among the following options has same thermal efficiency under ideal conditions (Operate within the same temperature)?
Carnot cycle and Brayton cycle
Carnot cycle and Stirling cycle
Carnot and dual cycle
Carnot cycle and Otto cycle
b
1
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11
The direction of the friction force is:
in the direction of motion of the body
in the opposite direction of motion of the body or in the opposite direction of the tendency to move
in the inclined direction of the motion of the body
in the perpendicular direction of the motion of the body
