ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 1

Report

A diesel engine develops a Brake power of 4.5 kW. Its indicated thermal efficiency is 30% and the mechanical efficiency is 85%. Considering calorific value of the fuel as 40000 kJ/kg, the fuel consumption will be

A

2.1 kg/hr

B

3.9 kg/hr

C

1.6 kg/hr

D

4.6 kg/hr

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 2

Report

A cycle consisting of two reversible isothermal processes and two reversible isobaric processes is known as

A

Atkinson cycle

B

Strling cycle

C

Brayton cycle

D

Ericsson cycle

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 3

Report

A large clearance volume in a reciprocating compressor results in

A

Reduced volume flow rate

B

Increased volume flow rate

C

Lower suction pressure

D

Lower delivery pressure

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 4

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Two beams have the same length, same allowable stresses and the same bending moment. The cross sections of the beams are a square and a rectangle with depth twice that of width.
The ratio of weight of square beam to the weight of rectangular beam is

A

0.85

B

0.75

C

0.95

D

1.25

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 5

Report

Two shafts A and B are made of same material. The diameter of shaft B is twice that of shaft A. The ratio of power which can be transmitted by shaft A to that of shaft B is

A

$$\frac{1}{2}$$

B

$$\frac{1}{4}$$

C

$$\frac{1}{8}$$

D

$$\frac{1}{16}$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 6

Report

The value of maximum deflection for a cantilever beam of length l and carrying uniformly varying load from zero at free end to w per unit length at fixed end is

A

$$\frac{wl^3}{8} EI$$

B

$$\frac{wl^3}{16} EI$$

C

$$\frac{wl^4}{30} EI$$

D

$$\frac{wl^3}{48} EI$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 7

Report

In a riveted joint, when the number of rivets decrease from the innermost rowto outermost row, the joint is said to be

A

Chain rivetted

B

Zig-zag rivetted

C

Diamond rivetted

D

None of these

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 8

Report

The process of reheating the martensitic steel to reduce its brittleness without any significant loss of hardnessis called

A

normalising

B

tempering

C

annealing

D

quenching

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 9

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$$\frac{18}{8}$$ stainless steel contains

A

18% steel, 8% chromium

B

18% chromium, 8% nickel

C

18% tungsten, 8% nickel

D

18% tungsten, 8% chromium

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 10

Report

Crowning of pulley is done to

A

Increase the tightness of the belt on the pulley

B

Prevent the belt running off the pulley

C

Increase the torque transmitted

D

Improve shape andstrength of pulley

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 11

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Flow of a liquid at a constant rate through a conical pipe is classified as

A

Unsteady, non uniform flow

B

Unsteady, uniform flow

C

Steady, non uniform flow

D

Steady, uniform flow

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 12

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The comparison between pumps operating in series and in parallel is

A

Pumps operating in series boost the head, whereas pumps in parallel boost the discharge

B

Pumps operating in series boost the discharge, whereas pumps in parallel boost the head

C

In both the cases there would be a boost in head only

D

In both the cases there would be a boost in discharging only

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 13

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A jet of water issuing from a nozzle strikes a flat plate normally (plane of plate makes an angle $$90^\circ$$ with the axis of the jet). The plate moves towards the nozzle with a velocity of 10 m/s while the jet issuing from the nozzle has a velocity of 15 m/s. The absolute velocity components of the jet (in m/s) as it leaves the vane, parallel (x component) and normal component (y component) to the undisturbed jet are. (Neglect friction on the surface).

A

$$V_x = 5, V_y = 5$$

B

$$V_x = -5, V_y = 5$$

C

$$V_x = 10, V_y = 10$$

D

$$V_x = -10, V_y = 25$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 14

Report

The overall heat transfer coefficient (U) for a composite wall of thicknesses $$x_1, x_2, x_3$$ and of corresponding thermal conductivities $$k_1, k_2, k_3$$, is given by equation

A

$$\frac{1}{U} = \frac{k_1}{x_1} + \frac{k_2}{x_2} + \frac{k_3}{x_3}$$

B

$$U = k_1x_1 + k_2x_2 + k_3x_3$$

C

$$\frac{1}{U} = \frac{x_1}{k_1} + \frac{x_2}{k_2} + \frac{x_3}{k_3}$$

D

$$\frac{1}{U} = \frac{x_1}{k_1} + \frac{x_2}{k_2} + \frac{k_3}{x_3}$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 15

Report

Three metal walls of the same cross-sectional area having thermal conductivities in the ratio 1:2:4 transfers heat at the rate of 3000 kJ/hr. For the same wall thickness, the
temperature drops will be in the ratio

A

$$1 : 2 : 4$$

B

$$1 : \frac{1}{2} : \frac{1}{4}$$

C

$$\frac{1}{4} : \frac{1}{2} : 1$$

D

$$1 : 1 : 1$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 16

Report

A electric heater of exposed surface area 0.09 m$$^2$$ and output 600 watts is designed to operate fully submersed in water. When the water is at $$37^\circ C$$ and the surface coefficient of heat transfer is 285.3 W/m$$^2$$-deg C, surface temperature of the heater will be

A

$$30.5^\circ C$$

B

$$60.5^\circ C$$

C

$$90.5^\circ C$$

D

$$120.5^\circ C$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 17

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The highest value of thermal conductivity is expected for

A

Solid ice

B

Steam

C

Water

D

Superheated steam

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 18

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The number of teeth of a spurgearis 30 and it rotates at 200 rpm. What will be its pitch line velocity if it has a module of ($$\frac{6}{\pi}$$) mm?

A

600 mm/s

B

300 mm/s

C

191 mm/s

D

164 mm/s

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 19

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A force of 271 N is applied to the break drum of 2 m diameter in band brake system as shown in figure, where the wrapping angle is $$180^\circ$$. If the coefficient of friction between the drum and the band is 7/22, the braking torque applied in Nm is

A

271

B

100

C

171

D

371

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 20

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Starting friction is low in which type of lubrication

A

Hydrostatic lubrication

B

Hydrodynamic lubrication

C

Mixed (semi fluid) lubrication

D

Boundary lubrication

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 21

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A helical spring has N turns of coil diameter D and a second spring, made of same wire diameter and same material, has N/2 turns of coil of diameter 2D. If the stiffness of the first spring is k, then the stiffness of the second spring will be

A

$$\frac{k}{4}$$

B

$$\frac{k}{2}$$

C

2k

D

4k

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 22

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A rigid rod PQ shown in Figure is connected to two sliders at each end through pins. The slider can slide along PR and QR. If the velocity of the slider at P is 4 m/s, the velocity of the midpoint of the rod PQ at this instant is

A

4 m/s

B

3 m/s

C

2 m/s

D

1 m/s

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 23

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A concentrated mass m is attached at centre of a rod of length 2 L as shown in figure. The rod is kept in a horizontal equilibrium position by a spring of stiffness 4 k. For very small amplitude of vibration, neglecting the weight of the rod and spring, the undamped natural frequency ($$w_n$$) of the system is

A

$$\surd(2 k/m)$$

B

$$\surd(4 k/m)$$

C

$$\surd(8 k/m)$$

D

$$\surd(16 k/m)$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 24

Report

At the time of starting, idling and low speed operation, the carburetor supplies a mixture which can be termed as

A

lean

B

slightly leaner than stochiometric

C

stochiometric

D

rich

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 25

Report

The crank radius of a single cylinder IC engine is $$\left(\frac{6}{\pi}\right)$$ mm and diameter of the cylinder is 40 mm. The swept volumeof the cylinder in cm$$^3$$ is

A

48

B

58

C

68

D

78

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 26

Report

For the same values of peak pressure, peak temperature and heat rejection, the correct order of efficiencies for Otto, Duel and Diesel cycles

A

Otto > Dual > Diesel

B

Dual > Diesel > Otto

C

Diesel > Dual > Otto

D

Diesel > Otto > Dual

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 27

Report

For determining the ignition quality of compression ignition engine fuels, the reference fuels used are

A

Iso octane and n heptane

B

Cetane and $$\alpha$$ methy naphthalene

C

Hexadecane and n heptanes

D

Cetane and iso octane

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 28

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Air enters diesel engine with a density of 1 kg/m$$^3$$. The compression ratio is 21. At steady state, the air intake is $$21 \times 10^{-3}$$ kg/s and the network output is 20 kW. The Mean effective pressure (kPa) is

A

500

B

1000

C

1500

D

2000

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 29

Report

The purpose of providing supercharging for engine is

A

to provide forced cooling air

B

to inject excess pressurized fuel

C

to raise exhaust pressure

D

to supply intake air at density higher than ambient air

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 30

Report

While designing refrigeration systemof anaircraft, the prime consideration is that

A

System has high COP

B

Power per TR is low

C

Mass of refrigerant circulated in the system is low

D

Mass of refrigeration system is low

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 31

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A good refrigerant should have

A

High latent of vaporization and low freezing point

B

High operating pressures and low freezing point

C

High specific volume and lowlatent heat of vaporization

D

Low COP and low freezing point

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 32

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The bypass factorof cooling coil

A

Decrease with increasein velocity of air passing through it

B

Increase with increasein velocity of air passing through it

C

Remains unchanged with increasein velocity of air passing through it

D

May increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 33

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The centrifugal compressorsare generally used for refrigerants that require

A

Small displacements and low condensing pressures

B

Large displacements and high condensing pressures

C

Small displacements and high condensing pressures

D

Large displacements and low condensing pressures

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 34

Report

Equation of a line normal to $$f(x) = (x + 4)^{\frac{1}{2}} + 1$$ at Q(0, 3) is:

A

y = 3 - 4x

B

y = 34 + 4x

C

4y = 12 + x

D

4y = 12 - x

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 35

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A box contains 2 blue, 3 black and 4 red balls. Balls are drawn from the box at random one at a time without replacement. The probability of drawing 2 blue balls first followed by 3 black balls and subsequently 4 red balls is

A

$$\frac{2}{350}$$

B

$$\frac{1}{629}$$

C

$$\frac{1}{1260}$$

D

$$\frac{1}{24}$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 36

Report

Using trapezoidal rule and dividing the interval of integration into three equal sub intervals, the definite integral $$\int_{-1}^{+1} \mid x \mid dx$$ is

A

1.11

B

2.22

C

3.33

D

4.44

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 37

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A circularring of radius 42 cm is cut and bentinto the form of a rectangle whose sides are in the ratio of 6:5. The small side of the rectangle is

A

80 cm

B

30 cm

C

120 cm

D

60 cm

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 38

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A tank is normally filled in 8 hours but takes 2 hours longer to fill because of a leak in the bottom. If the tank is full and due to leakage alone, the tank will get empty in
................. hours (Assume no further filling happens)

A

20

B

40

C

30

D

50

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 39

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From a circular sheet of paper of radius 50 cm, a sector of 40% area is removed in the shape of an arc section. If the remaining part is used to make a conical surface, then the ratio of the radius to height of the cone is

A

$$\frac{4}{3}$$

B

$$\frac{5}{4}$$

C

$$\frac{3}{4}$$

D

$$\frac{7}{8}$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 40

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Triple point of a substance

A

Occurs in a mixture of two or more gases

B

Is the point where three phases exists together

C

Occurs in sublimation

D

None of the above

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 41

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A liquid is boiling in a airtight vessel. Using an exhaust tube the vapour is pumped out at a faster rate. What will happento the liquid?

A

Temperature will go down but boiling will continue

B

Temperature will rise and boiling will continue

C

Boiling will stop

D

Vapour starts condensing

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 42

Report

The equivalent evaporation rate (kg/hr) of a boiler producing 2000 kg/hr of steam with enthalpy content of 2426 kJ/kg from feed water at temperature 40 deg. C (liquid enthalpy = 168 kJ/kg and enthalpy of vaporization of water at 100 deg. C = 2258 kJ/kg) is

A

2000

B

2249

C

1658

D

1649

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 43

Report

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

A

Carnot cycle

B

Sterling cycle

C

Otto cycle

D

Diesel cycle

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 44

Report

The maximum theoretical work obtainable, when a system interacts to equilibrium with a reference environment, is called

A

Entropy

B

Enthalpy

C

Exergy

D

Rothalpy

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 45

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If a circular shaft is subjected to a torque T and a bending moment M, the ratio of the maximum shear stress to maximum bending stress is

A

$$\frac{2M}{T}$$

B

$$\frac{T}{2M}$$

C

$$\frac{2T}{M}$$

D

$$\frac{M}{2T}$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 46

Report

A simply supported beamof length 3 mcarries a concentrated load of 12 kN at a distance of 1m from left support. The maximum bending momentin the beam is

A

12 kNm

B

24 kNm

C

8 kNm

D

16 kNm

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 47

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A girder of uniform section and constant depth is freely supported over a span of 3 metres. The point load at the midpoint is 30 kN and Momentof inertia = $$15 \times 10^{-6} m^4$$ and youngs modulus = 200 GN/m$$^2$$. The deflection at centre will be

A

6.6 cm

B

8.6 cm

C

5.6 mm

D

6.6 mtr

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 48

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A copper rod 3 mm in diameter when subjected to a pull of 495 N extends by 0.07 mm over a gauge length of 100 mm. The youngs modulus for copper will be

A

$$1 \times 10^5 N/mm^2$$

B

$$1 \times 10^6 N/mm^2$$

C

$$7 \times 10^5 N/mm^2$$

D

$$1 \times 10^7 N/mm^2$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 49

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When a body is subjected to three mutually perpendicular stresses of equal intensity, the ratio of direct stress to the expanding volumetric strain is known as

A

Young’s modulus

B

Modulus of rigidity

C

Bulk modulus

D

Poisson’s ratio

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 50

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The bending moment in the centre of a simply supported beam carrying a uniformly distributed load of w per unit length is

A

zero

B

$$\frac{wl^2}{2}$$

C

$$\frac{wl^2}{4}$$

D

$$\frac{wl^2}{8}$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 51

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A uniform wooden cylinder has a specific gravity of 0.5. Find the ratio of diameter to length of the cylinderso that it will just float upright in a state of neutral equilibrium in water

A

$$\sqrt{2}$$

B

$$\sqrt{3}$$

C

2

D

3

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 52

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In s siphon, the summit is 3 m above the water level in the reservoir from which the flow is being discharged. If the head loss from the inlet of the siphon to the summit is 1.5 m and the velocity head at the summitis 0.5 m, the absolute pressure at the summit is

A

5.3 m of water

B

9.3 m of water

C

6.3 m of water

D

5 m of water

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 53

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Two pipe lines of equal length and diameters of 10cm and 40cm are connected in parallel between two reservoirs. If friction factor f is same for both the pipes, the ratio of the
discharges in the larger to the smaller pipe is

A

4

B

16

C

32

D

64

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 54

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The fluid property responsible for the problem of water hammer is

A

viscosity

B

density

C

elasticity

D

surface tension

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 55

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Within a boundary layer

A

The order of viscous force is much higher than that of the inertia force

B

The order of viscous force is equal to that of the inertia force

C

The order of viscous force is muchless than that of the inertia force

D

Both the forces are zero

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 56

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The values of enthalpy of steamat inlet and outlet of a steam turbine in a Rankinecycle are 2800 kJ/kg and 1800 kJ/kg respectively. Neglecting pump work, the specific steam
consumptionin kg/kW-hour is

A

3.60

B

0.36

C

0.06

D

0.01

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 57

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A pump handlinga liquid raises its pressure from 1 barto 30 bar. Take the density of liquid as 990 kg/m$$^3$$. The isentropic specific work done by the pumpin kj/kg is

A

3.93

B

1.93

C

4.93

D

2.93

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 58

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A heat engine using lake water at $$12^\circ C$$ as source and the surrounding atmosphere at $$2^\circ C$$ as sink executes 1080 cycles per min. If the amount of heat drawn per cycle is 57 J, then the output of the engine will be

A

66 W

B

46 W

C

56 W

D

36 W

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 59

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The unit of Stefan Boltzmann constant is

A

$$Watt/cm^2 K$$

B

$$Watt/cm^4 K$$

C

$$Watt/cm K^4$$

D

$$Watt/cm^2 K^4$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 60

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In a furnace, the wall thickness is 60 cm and is 100 cm wide by 150 cm height made of material with thermal conductivity 0.4 W/mK. The temperature inside and outside are $$1000^\circ C$$ and $$4^\circ C$$ respectively. The thermal resistance is

A

1 K/W

B

2 K/W

C

18 K/W

D

15 K/W

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 61

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The rate of heat flow through a composite wall of three layers of thickness 0.3 m, 0.2 m, 0.15 m and of corresponding thermal conductivities 1.2, 0.8 and 0.6 kJ/hr-m$$^\circ C$$ is 1280 kd/hr. If the surface area normal to the direction of heat flow is 1 sq.mtr. and inner surface temperature is $$1000^\circ C$$, then the interface temperature at the end of first layer will be

A

$$700^\circ C$$

B

$$680^\circ C$$

C

$$500^\circ C$$

D

$$360^\circ C$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 62

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For the four link mechanism with the dimensions of the links indicated in standard units of length, choose the type of mechanism from the given options

A

crank rocker

B

double crank

C

double rocker

D

rocker

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 63

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Operating pressure angle for involute gear teeth is

A

Maximum at engagement of teeth

B

Minimum at engagement of teeth

C

Sameat all points of contact

D

Vary uniformly at all points of contact

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 64

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For the position of the mechanism shown in Figure, find the velocity of the slider B for the given configuration if the velocity of the slider A is 3 m/s. Consider AB as a rigid link and is parallel to CD at this instant.

A

3 m/s

B

$$3\sqrt{2}$$ m/s

C

$$\frac{3}{\sqrt{2}}$$ m/s

D

1.5 m/s

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 65

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The device used to heat feed water by utilizing the heat of the exhaust flue gases before leaving through the chimney is called

A

Super heater

B

Economizer

C

Air preheater

D

Evaporator

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 66

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The power consumed by a reciprocating air compressor will be minimum, if the compression follows the following thermodynamic process

A

isothermal

B

isentropic

C

adiabatic

D

polytropic

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 67

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In an impulsereaction turbine stage, the heat drop in fixed and moving blades are 20 kJ/kg and 30 kJ/kg respectively. The degree of reaction for this stage will be

A

$$\frac{3}{5}$$

B

$$\frac{5}{3}$$

C

$$\frac{2}{5}$$

D

$$\frac{5}{2}$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 68

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Which among the following automobile exhaust gas pollutants is a major cause of photochemical smog?

A

$$CO$$

B

$$CO_2$$

C

$$NO_2$$

D

$$SO_2$$

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 69

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In a two stage reciprocating air compressor with a suction pressure of 4 bar and delivery pressure of 16 bar, the ideal intercooler pressure will be

A

10 bar

B

8 bar

C

32 bar

D

20 bar

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 70

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In PERT chart, the activity time distribution is

A

Normal

B

Poisson

C

Binomial

D

Beta

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 71

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Dew point temperature lines on the psychometric chart are

A

Horizontal

B

Vertical

C

Curved

D

Straight inclined slopping downward to the right

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 72

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The lowest temperature during the cycle in a vapour compression system occurs after

A

Compression

B

Expansion

C

Condensation

D

Evaporation

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 73

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The principle of vapour compression system is that fluids absorb heat while changing from a

A

Vapour phase to liquid phase and give up heat in changing from liquid phase to vapour phase

B

Liquid phase to vapour phase and give up heat in changing from a vapour phase to liquid phase

C

Vapour phaseto liquid phase only

D

Liquid phase to solid state phase and give up heat in changing from solid state to liquid phase

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 74

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Sensible heat factor is defined as the ratio of

A

Latent heat to sensible heat

B

Sensible heat to latent heat

C

Latent heat to total heat

D

Sensible heat to total heat

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 75

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In vapour compression refrigeration system, heatrejected as compared to heat absorbed is

A

More

B

Less

C

Equal

D

Depends on the refrigerant used

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 76

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As warm air cools, it’s relative humidity

A

Increases

B

Decreases

C

Remains same

D

Depends on wet bulb temperature

View Solution

ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 77

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Consider the shaded triangle region P shown in the figure
What is $$\int\int_{P} xydxdy$$

A

$$\frac{1}{6}$$

B

$$\frac{2}{9}$$

C

$$\frac{1}{7}$$

D

$$1$$

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 78

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Distance between origin and_ the point nearest to it on the surface $$z^2 = 1 + xy$$ is:

A

$$\frac{\sqrt{3}}{2}$$

B

1

C

$$\sqrt{3}$$

D

2

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 79

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At $$x = 0$$, the function $$f(x) = \mid x \mid$$ has

A

A maximum

B

A point of inflection

C

A minimum

D

Neither maximum nor minimum

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ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2019 - Question 80

Report

General solution of differential equation $$\frac{dy}{dx} = \cos(x + y)$$ is

A

$$\tan\left(\frac{x + y}{2}\right) = y + c$$

B

$$\sin\left(\frac{x + y}{2}\right) = y + c$$

C

$$\cos\left(\frac{x + y}{2}\right) = x + c$$

D

$$\tan\left(\frac{x + y}{2}\right) = x + c$$

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