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- Question
Mechanical efficiency of a centrifugal pump is the ratio of
Options- A. energy available at the impeller to the energy supplied to the pump by the prime mover
- B. actual workdone by the pump to the energy supplied to the pump by the prime mover
- C. energy supplied to the pump to the energy available at the impeller
- D. manometric head to the energy supplied by the impeller per kN of water
- Correct Answer
- energy available at the impeller to the energy supplied to the pump by the prime mover
- 1. The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called
Options- A. First law of thermodynamics
- B. Newton's law of cooling
- C. Newton's law of heating
- D. Stefan's law Discuss
- 2. It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be
Options- A. dehumidification
- B. cooling and humidification
- C. cooling and dehumidification
- D. dehumidification and pure sensible cooling Discuss
- 3. When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to
Options- A. zero
- B. one
- C. ?/2
- D. ? Discuss
- 4. In a lithium bromide absorption refrigeration system
Options- A. lithium bromide is used as a refrigerant and water as an absorbent
- B. water is used as a refrigerant and lithium bromide as an absorbent
- C. ammonia is used as a refrigerant and lithium bromide as an absorbent
- D. none of the above Discuss
- 5. A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
Options- A. the better insulation must be put inside
- B. the better insulation must be put outside
- C. one could place either insulation on either side
- D. one should take into account the steam temperature before deciding as to which insulation is put where Discuss
- 6. The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called
Options- A. conduction
- B. convection
- C. radiation Discuss
- 7. The breaking stress is __________ the ultimate stress.
Options- A. equal to
- B. less than
- C. greater than Discuss
- 8. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by
Options- A. liquid pump
- B. generator
- C. absorber and generator
- D. absorber, generator and liquid pump Discuss
- 9. In reaming process
Options- A. metal removal rate is high
- B. high surface finish is obtained
- C. high form accuracy is obtained
- D. high dimensional accuracy is obtained Discuss
- 10. The power per tonne of refrigeration is
Options- A. 3.5/C.O.P.
- B. C.O.P/3.5
- C. 3.5 x C.O.P.
- D. none of these Discuss
More questions
Correct Answer: Newton's law of cooling
Correct Answer: cooling and dehumidification
Correct Answer: one
Correct Answer: water is used as a refrigerant and lithium bromide as an absorbent
Correct Answer: the better insulation must be put inside
Correct Answer: convection
Correct Answer: less than
Correct Answer: absorber, generator and liquid pump
Correct Answer: high form accuracy is obtained
Correct Answer: 3.5/C.O.P.
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