21) Which one of the following is NOT an accessory for the boiler ?
a) Condenser
b) Economizer
c) Air preheater
d) Feed water pump
22) The value of critical pressure ratio for initially wet steam is
a) 0.5
b) 0.546
c) 0.582
d) 0.64
23) The ferrite materials are
a) U233 and Pu239
b) U238 and Th232
c) U238 and Pu239
d) U238 and Th239
24) The unit of radioactivity is
a) Electron-volt
b) AMU
c) Curie
d) None of these
25) In Kaplan turbine runner, the number of blades are
a) 2-4
b) 4-8
c) 8-16
d) 16-24
26) A centrifugal pump gives maximum efficiency when its blades are
a) Bent forward
b) Bent backward
c) Straight
d) Wave shaped
27) The surrounding air is not used as oxidizer in
a) flying bomb
b) rocket propulsion
c) turbo jet
d) turbo prop
अगर आप सरकारी नौकरी या प्राइवेट नौकरी से जुड़ी कोई जानकारी प्राप्त करना चाहते हैं तो कमेंट बॉक्स में कमेंट करें।