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- Question
Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg.
Options- A. 80.38
- B. 80
- C. 79.62
- D. 78.51
- Correct Answer
- 79.62
- 1. Which of the following is an undesirable dynamic characteristic of an instrument?
Options- A. Reproducibility
- B. Dead zone
- C. Time lag
- D. Static error Discuss
- 2. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?
Options- A. Platinum-platinum + rhodium.
- B. Iron-constantan.
- C. Chromel-constantan.
- D. All will give the same output. Discuss
- 3. Which of the following controllers has the least maximum deviation?
Options- A. P-controller
- B. P-I controller
- C. P-I-D controller
- D. P-D controller Discuss
- 4. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?
Options- A. Peltier effect
- B. Thomson effect
- C. Seebeck effect
- D. none of these Discuss
- 5. Which of the following will give maximum gas conversion?
Options- A. Fixed bed reactor.
- B. Fluidised bed reactor.
- C. Semi-fluidised bed reactor.
- D. Plug-flow catalytic reactor. Discuss
- 6. 6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant?
Options- A. 100%
- B. 95%
- C. 75%
- D. 20% Discuss
- 7. The melleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the miximum malleability?
Options- A. Lead
- B. Copper
- C. Aluminium
- D. Wrought iron Discuss
- 8. Which of the following has the highest compressive strength?
Options- A. Wrought iron
- B. Cast iron
- C. Mild steel
- D. High carbon steel Discuss
- 9. Which of the following stainless steels is non-magnetic?
Options- A. Ferritic
- B. Martensitic
- C. Austenitic
- D. None of these Discuss
- 10. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?
Options- A. Invar
- B. Constantan
- C. Chromel
- D. Alumel Discuss
More questions
Correct Answer: Time lag
Correct Answer: Chromel-constantan.
Correct Answer: P-D controller
Correct Answer: Thomson effect
Correct Answer: Semi-fluidised bed reactor.
Correct Answer: 95%
Correct Answer: Lead
Correct Answer: High carbon steel
Correct Answer: Austenitic
Correct Answer: Invar
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