Engineering :: Heat Engines

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31.

In a surface condenser near to the air pump suction the vacuum is 500 mm of mercury with 730 mm of mercury height in a barometer. The pressure near the air pump suction would be

A.	1230 mm Hg	B.	0.69 kg/sq-cm
C.	0.687 kg/sq-cm	D.	0.313 kg/sq-cm
E.	1.213 kg/sq-cm

32.

A radiation pyrometer is used for temperatures

A.	Upto 100?C	B.	100 - 250?C
C.	250 - 500?C	D.	Above 500?C
E.	Below 100?C

33.

The lowest temperatures that can be measured by a gas thermometer using nitrogen is

A.	0?C	B.	? 10?C
C.	? 100?C	D.	? 137?C
E.	? 200?C

34.

An optical pyrometer works on the principle of

A.	Expansion of fluids	B.	Change of electrical resistance
C.	Thermo-electric effect	D.	Total radiation
E.	Mono-chromatic radiation

35.

The lowest temperature upto which a mercury thermometer can be used is

A.	0?C	B.	? 10?C
C.	? 39?C	D.	? 173?C
E.	? 260?C

36.

A compound pressure gauge measures

A.	Compound pressures	B.	Complex pressures
C.	Variable pressures	D.	Positive and negative pressures
E.	Average pressure

37.

1 Torr is equivalent to

A.	1 mm Hg	B.	13.6 cm of water column
C.	760 mm of water	D.	760 mm of Hg
E.	None of the above

38.

A gas used in gas engine trial was tested in a Boys Calorimeter. The pressure of gas supply was 7 cm of water column. If the barometric pressure is 760 mm of mercury, the absolute pressure of the gas would be

A.	0.007 kg/sq-cm	B.	0.14 kg/sq-cm
C.	1.04 kg/sq-cm	D.	1.14 kg/sq-cm
E.	None of the above

39.

Thermie

A.	Is a unit of temperature measurement	B.	Is a unit of latent heat measurement
C.	Is thermal conductivity of materials	D.	Is quantity of heat required to raise temperature of one tonne of water from 14.5?C to 15.5?C
E.	Is the temperature change in water when 1000 calories of heat are added to 1 gm of water, gradually

40.

A certain gas occupies 2 cu-m at a temperature of 400?C. It receives heat at constant pressure till its temperature is doubled. The change in volume would be

A.	3.8 cu-m	B.	3.188 cu-m
C.	0.038 cu-m	D.	0.19 cu-m
E.	0.019 cu-m