Discussion
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- Question
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)
Options- A. 25 kJ/kg
- B. 50 kJ/kg
- C. l00 kJ/kg
- D. 125 kJ/kg
- Correct Answer
- 50 kJ/kg
- 1. Seam welding is best adopted for metal thickness ranging from
Options- A. 0.025 to 3 mm
- B. 3 to 5 mm
- C. 5 to 8 mm
- D. 8 to 10 mm Discuss
- 2. A spring used to absorb shocks and vibrations is
Options- A. conical spring
- B. torsion spring
- C. leaf spring
- D. disc spring Discuss
- 3. A manometer can be used to measure vacuum pressures.
Options- A. Agree
- B. disagree Discuss
- 4. Cold working of metal increases
Options- A. tensile strength
- B. yield strength
- C. hardness
- D. all of these Discuss
- 5. The strength of the shaft is judged by the torque transmitted by the shaft.
Options- A. Yes
- B. No Discuss
- 6. The pressure of a liquid measured with the help of a piezometer tube is
Options- A. vacuum pressure
- B. gauge pressure
- C. absolute pressure
- D. atmospheric pressure Discuss
- 7. Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.
Options- A. True
- B. False Discuss
- 8. The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is
Options- A. 1.02
- B. 1.32
- C. 1.66
- D. 1.82 Discuss
- 9. Enriched uranium may contain fissionable contents from
Options- A. 1 to 40%
- B. 10 to 50%
- C. 1 to 80%
- D. 1 to 99% Discuss
- 10. In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in
Options- A. condenser
- B. evaporator
- C. absorber
- D. none of these Discuss
More questions
Correct Answer: 0.025 to 3 mm
Correct Answer: leaf spring
Correct Answer: Agree
Correct Answer: all of these
Correct Answer: Yes
Correct Answer: gauge pressure
Correct Answer: True
Correct Answer: 1.32
Correct Answer: 1 to 99%
Correct Answer: condenser
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