Questions and answers for exam Preparation

MCQs

Total Questions : 100 | Page 6 of 10 pages

Question 51. Which of the following happens to the magnetic susceptibility of gases when the temperature changes?

It increases with increase in temperature
It decreases with increase in temperature
It remains constant with increase in temperature
It remains constant with decrease in temperature

Discuss Question

Answer: Option B. -> It decreases with increase in temperature
Answer: (b).It decreases with increase in temperature

Question 52. If the oxygen content is not greater than 21%, which of the following gases must be used to set the span point?

Oxygen
Dry air
Nitrogen
Hydrogen

Discuss Question

Answer: Option B. -> Dry air
Answer: (b).Dry air

Question 53. If the oxygen content is greater than 21%, which of the following gases must be used to set the span point?

Oxygen
Dry air
Nitrogen
Hydrogen

Discuss Question

Answer: Option A. -> Oxygen
Answer: (a).Oxygen

Question 54. Which of the following does not occur in Hartman and Braun oxygen analyzer based on the magnetic wind?

Oxygen is attracted to the magnetic field
Oxygen becomes less paramagnetic due to rise in temperature
Resistance change in a resistance connected to the Wheatstone bridge occur
Wheatstone Bridge becomes balanced due to temperature change

Discuss Question

Answer: Option D. -> Wheatstone Bridge becomes balanced due to temperature change
Answer: (d).Wheatstone Bridge becomes balanced due to temperature change

Question 55. Which of the following is not a cause of the error that could occur in Hartman and Braun oxygen analyzer based on the magnetic wind?

The filament temperature could be affected by changes in thermal conductivity of the carrier gas
Hydrocarbons in sample stream may react on the heated filaments
Gravitation chimney flow effect lead to errors when cross tube is horizontal
Combustible gases may react on the heated filaments

Discuss Question

Answer: Option C. -> Gravitation chimney flow effect lead to errors when cross tube is horizontal
Answer: (c).Gravitation chimney flow effect lead to errors when cross tube is horizontal

Question 56. Hydrocarbons need to be removed from the sample gas to avoid errors in Hartman and Braun oxygen analyzer.

True
False
May be True or False
Can't say

Discuss Question

Answer: Option A. -> True
Answer: (a).True

Question 57. Magnetic wind analyzers are also known as which of the following?

Thermo-magnetic analyzers
Electro-magnetic analyzers
Thermo-analytical analyzers
Hot wire analyzers

Discuss Question

Answer: Option A. -> Thermo-magnetic analyzers
Answer: (a).Thermo-magnetic analyzers

Question 58. In OXYMAT-M oxygen analyser which of the following is usually used as reference gas?

Hydrogen
Nitrogen
Helium
Ambient air

Discuss Question

Answer: Option D. -> Ambient air
Answer: (d).Ambient air

Question 59. Which of the following is used in magnetic wind instruments to determine the amount of oxygen?

Change in resistance
Change in capacitance
Change in inductance
Change in concentration

Discuss Question

Answer: Option A. -> Change in resistance
Answer: (a).Change in resistance

Question 60. Which of the following concepts are not used in magnetic wind instruments?

Change in resistance due to cooling by magnetic wind
Displacement of membrane by magnetised oxygen
Difference in pressure difference between two gases having varying concentration of oxygen
By measuring temperature using thermometer

Discuss Question

Answer: Option D. -> By measuring temperature using thermometer
Answer: (d).By measuring temperature using thermometer