An under-designed steam trap will___________________?

Related Mcqs:

1. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effects in evaporation ?

   A. Increases capacity
   B. Increases economy
   C. Does not affect the capacity
   D. Both B. & C.

2. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about _____________ kcal/hr.m2.°C?

   A. 1250
   B. 2500
   C. 7500
   D. 15000

3. A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________________?

   A. 5 mm
   B. 6 mm
   C. 8 mm
   D. 10 mm

4. Commercial packed scrubbers are normally designed for a pressure drop range of ______________ mm water column per metre of packed height?

   A. 4-8
   B. 17-34
   C. 52-68
   D. 88-105

5. ____________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.)?

   A. Hemispherical
   B. Dished
   C. Ellipsoidal
   D. Conical

6. The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about ______________ times the design pressure?

   A. 1.5 to 2
   B. 3 to 4
   C. 4 to 5
   D. > 5

7. Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________?

   A. 0.01 to 1
   B. 1.5 to 2.5
   C. 5 to 10
   D. 10 to 20

8. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about _________________ mm of water column per metre height of packing?

   A. 1-5
   B. 20-40
   C. 100-150
   D. 1000-1500

9. Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about _______________ mm Hg (referred to a 760 mm mercury barometer)?

   A. 250
   B. 450
   C. 650
   D. 750

10. The normal range of velocity of steam in pipes is _________________________ m/sec?

    A. 0.1-0.5
    B. 1-5
    C. 10-20
    D. 80-100