61.

62,

64.

66.

67.

68.

The critical temperature and pressure of steam are :
ക) 373550, 225 bar ൫) 38350, 252 bar
(© 348°C, 184 bar D) 409°C, 166 bar

The mechanical efficiency of & 60 kW engine is 80%. What is the mechanical efficiency at 50%
of rated load, if the frictional power is assumed as constant with load?

(ക) 9 (®) 76.7%
(0 50% @ 80%

The relation for volumetric efficiency of a reciprocating compressor with clearance volume
ratio C:

ல ௦0௫/2) © 1-0+ ‏١/0‎
‎ட ௨௦0-0௬௨ 0) 1+©- (९12)

The output of a gas turbine is 800 kJ/kg. What is the thermal efficiency, if the compressor
work and the heat supplied are 500 kJ/kg and 100 kJ/kg respectively?

(ക) 80% B 30%
© 40% D) 50%

A refrigerating machine working on Reversed Carnot Cycle takes 3 kW from a space with
temperature 150 K. What is the power required to run the gystem in kW and the COP, if the
heat is rejected at 300 K?

@) 51 ® 52
© 31 o 1.3

What is the specific humidity in kg/kg of dry air of the given air which is under a pressure of
100 ೫೫೩ and with DBT 35°C, DPT 20°C and the corresponding saturation pressure 5 kPa and
2 kPa respectively?

۵ 6 © 6
©) 0.0236 © 686

In a room, the latent heat load and the sensible heat load are 50 kd/sec and 30 kJ/sec
respectively. Then the sensible heat factor 18 :

(4) 0.876 1 0.6
© 1.5 D) 0.25

‘Which dimension less number has a significant role in forced convection?
(മ) Prandtl number (3) Reynolds number
(0) Peclet number (D) Mach number

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