Related Questions

A manhole is generally provided at each
A Bend
B Junction
C Change of gradient
D All the above
The inspection pit or chamber is a manhole provided in a base drainage system
A At every change of direction
B At every change of gradient
C At every 30 m intervals
D All the above
A manhole is classified as shallow if its depth is between
A 0.4 to 0.5 m
B 0.5 to 0.7 m
C 0.7 to 0.9 m
D 0.9 to 1.20 m
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
A Hydrogen sulphide
B Carbon dioxide
C Methane
D Oxygen
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
A Carbondioxide gas
B Hydrogen sulphide gas
C Methane gas
D Petrol vapours
Lead acetate test in sewer manhole is done to test the presence of
A Methane gas
B Hydrogen sulphide
C Carbondioxide gas
D Diesel vapours
Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher
A Ductility
B Impact strength
C Machinability
D Melting point
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:
A mercury is a metal.
B density of mercury is greater than that of water.
C cohesion of mercury is greater than its adhesion with glass.
D cohesion of water is greater than its adhesion with glass.
The ratio of the useful heat drop to the isentropic heat drop is called
A Condenser efficiency
B Nozzle efficiency
C Boiler efficiency
D Vacuum efficiency
The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
A 0.4
B 0.56
C 0.67
D 1.67

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