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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. When the grinding wheel is marked by the letters from I to P, it indicates that the grinding wheel is of hard grade.
Options- A. True
- B. False Discuss
- 2. The cylinder of a gas engine is made __________ than that of the petrol engine.
Options- A. smaller
- B. larger Discuss
- 3. The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)
Options- A. n
- B. n2
- C. 2n
- D. 2n - 1 Discuss
- 4. Which of the following statement is correct?
Options- A. The algebraic sum of the forces, constituting the couple is zero.
- B. The algebraic sum of the forces, constituting the couple, about any point is the same.
- C. A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense.
- D. all of the above Discuss
- 5. When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.
Options- A. Yes
- B. No Discuss
- 6. A body of mass m moving with a constant velocity v strikes another body of same mass m moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
Options- A. v
- B. 2v
- C. 4v
- D. 8v Discuss
- 7. A machine having an efficiency less than 50%, is known as
Options- A. reversible machine
- B. non-reversible machine
- C. neither reversible nor non-reversible machine
- D. ideal machine Discuss
- 8. Moment of inertia of a hollow rectangular section as shown in the below figure about Y-Y axis, is not the same as that about X-X axis.
Options- A. Yes
- B. No Discuss
- 9. One joule means that
Options- A. work is done by a force of 1 N when it displaces a body through 1m
- B. work is done by a force of 1 kg when it displaces a body through 1 m
- C. work is done by a force of 1 dyne when it displaces a body through 1 cm
- D. work is done by a force of 1 g when it displaces a body through 1 cm Discuss
- 10. One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.
Options- A. 8/3
- B. 11/3
- C. 11/7
- D. 7/3 Discuss
More questions
Correct Answer: False
Correct Answer: larger
Correct Answer: 2n
Correct Answer: all of the above
Correct Answer: Yes
Correct Answer: 2v
Correct Answer: non-reversible machine
Correct Answer: Yes
Correct Answer: work is done by a force of 1 N when it displaces a body through 1m
Correct Answer: 7/3
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