Related Questions

The metal rectifiers, as compared to mercury arc rectifiers
A operate on low temperatures
B can operate on high voltages
C can operate on heavy loads
D give poor regulation
E none of the above
For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is
A More
B Less
C Equal
D Either A or B; depends on the viscosity of the fluid
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. Which of the following, if given to the mixing vat operator as an instruction, would not determine the setting of any other valve ?
A S must be open
B T must be open
C U must be open
Main gas valve in a gaseous fuel burner is a __________ valve.
A Gate
B Butterfly
C Globe
D None of these
In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
A 50° - 60°
B 60° - 70°
C 70° - 80°
D 80° - 90°
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
A 10° - 15°
B 15° - 25°
C 25° - 30°
D 30° - 40°
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will
A Cause withdrawing or throttling of steam
B Reduce length of effective stroke of piston
C Reduce maximum opening of port to steam
D All of these
The size of inlet valve of an engine in comparison to exhaust valve is
A More
B Less
C Same
D More/less depending on capacity of engine
The inherent characteristic of an equal percentage valve relating flow rate 'q' with valve stem movement 'x' are described by the equation
A $$\frac{{{\text{dq}}}}{{{\text{dx}}}} = {\text{K}}$$
B $$\frac{{{\text{dq}}}}{{{\text{dx}}}} = {\text{K}} \times {\text{q}}$$
C $$\frac{{{\text{dq}}}}{{{\text{dx}}}} = \frac{{\text{K}}}{{\text{q}}}$$
D $$\frac{{{\text{dq}}}}{{{\text{dx}}}} = {\text{K}} \times {{\text{q}}^2}$$
The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.
A Greater than
B Less than
C Equal to
D None of these

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