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For the following questions answer them individually
When starting a centrifugal pump, the delivery valve is kept
Fully open
Fully closed
Half open
Less than half open
Cavitation may occur in a fluid flow if
Its enthalpy suddenly increases
Its enthalpy suddenly decreases
Its velocity suddenly reduces to zero
Its pressure reduces to the level of vapour pressure
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes into the furnace for combustion purpose, is known as
Superheater
Air preheater
Reheater
Economiser
Which aspect is not valid for a fire tube locomotive boiler?
Externally fired
Horizontal placement
Multi-tubular
Mobile unit
An ideal fluid
Has no velocity
Is compressive
Obeys Newton’s law of velocity
In both incompressible and non-viscous
Refer to the figure:- $$P_{A} - P_{B}$$ is
$$h\left(\frac{\rho_{m}}{\rho_{1}}\right) \delta$$
$$h\left(\rho_m - \rho_1 \right) \delta$$
$$h(\rho_m \rho_1) \delta$$
$$h(\rho_m + \rho_1) \delta$$
For a body placed in water, the resultant hydrostatic force at its:
center of gravity
Metacenter
Center of pressure
Center of buoyancy
Flux used in brazing is
Aluminium
Borax
Zinc chloride
Calcium carbide
A Rota meter is used to measure
Flow rate of fluids
Viscosity of fluids
Density of fluids
Rotational energy of fluids
In pressure welding, the pressure required to consummate the weld is
Mechanical
Hydraulic
Spring
Air
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