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.Management Sciences
Category: Mechanical Engineering Mcqs
In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
A. remain unaffected
B. improve C. worsen
C. may improve/worsen depending on size
D. unpredictable
On weight basis, air contains following parts of oxygen_________________?
A. 21
B. 23
C. 25
D. 73
E. 79
The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?
A. same
B. more
C. less
D. less or more depending on operating conditions
E. unpredictable
Casting of a centrifugal pump is designed so as to minimize________________?
A. friction loss
B. cavitation
C. static head
D. loss of kinetic energy
E. starting time
Adiabatic process is________________?
A. essentially an isentropic process
B. non-heat transfer process
C. reversible process
D. constant temperature process
E. constant enthalpy process
The hardness of steel increases if it contains____________________?
A. austenite
B. martensite
C. pearlite
D. cementite
E. all of the above
In forced recirculation type boiler__________________?
A. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
B. water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
C. feed pump is employed to supplement natural circulation in water wall type furnace
D. water is converted into steam in one pass without any recirculation
E. heating of water takes place in stages
Barometer is used to measure__________________?
A. pressure in pipes, channels etc.
B. atmospheric pressure
C. very low pressure
D. difference of pressure between two points
E. rain level
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be___________________?
A. towards the wall at its upper end
B. away from the wall at its upper end
C. upwards at its upper end
D. downwards at its upper end
E. none of the above
The alloy used for making electrical resistances and heating elements is____________________?
A. nichrome
B. invar
C. magnin
D. elinvar
E. peiminvar
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