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Operation, Maintenance and Repair of Auxiliary Generators


Quiz Questions

 

1.Prime movers are reciprocating engines, gas turbines, or other sources of mechanical energy used to drive electric generators.
True
False
2. governors control and regulate engine speed. A governor must be capable of regulating engine speed at conditions varying between full-load and no-load and controlling frequency.
True
False
3.Generators are machines (rotating units) that convert mechanical energy into electrical energy.
True
False
4.Exciters are small supplemental generators hat provide DC field current for alternating current generators. Either rotating or static-type exciters are used.
True
False
5.Voltage regulators are devices that maintain the terminal voltage of a generator at a predetermined value.
True
False
6.In gas turbine engine the fuel and air burn in a combustion chamber in the gas turbine engine. The resulting high pressure gases are directed through nozzles toward turbine blades and produce work by turning the turbine shaft.
True
False
7.The principals of Otto cycle are:
Intake stroke
Compression stroke
Power stroke
Exhaust stroke
True
False
8.The advantages of a four-cycle (Otto Cycle) SI gasoline engine are:
Low initial cost
Light weight for given output
Simple maintenance
Easy cranking
Quick starting providing fuel is fresh
Low noise level
Ture
False
9.The disadvantageous of above engine are:
Greater attendant safety hazard due to use of volatile fuel
Greater specific fuel consumption than compression ignition (CI) engines.
True
False
10.The advantages of using a gas turbine are:
Proven dependability for sustained operation at rated load.
Can use a variety of liquid and gaseous fuels
Low vibration level
High efficiency up to rated load.
True
False
11.The disadvantageous of using a gas turbine are:
Initial cost is high
Fuel and air filtering are required to avoid erosion of nozzles or blades
Fine tolerance speed reducer between turbine and generator is required and must be kept in alignment
Specialized maintenance, training, tools and procedures are required.
High frequency noise level
Exhaust volume is considerable
A large portion of the fuel heat input is used by the compressor
A long bed plate is required
Maximum load is sharply defined
Efficiency is lower than reciprocating engines.
True
False
12.The advantages of diesel engine are:
Proven dependability for sustained operation at rated load
Efficiency
Adaptability for wide range of liquid fuels
Controlled fuel injection
True
False
13.The disadvantages of a diesel engine are:
High initial cost
High weight per given output
High noise level
Specialized maintenance
Fuel injection system has fine mechanical tolerances and requires precise adjustment
Difficult cranking
Cold starting requiring auxiliary ignition aids
Vibration
True
False
14.The large stationary diesel generator in fig 3-3 is:
In-line engine configurations
V-type engine configurations
15.The turbine wheel in the turbocharger in figure 3-16 is:
A radial flow turbine wheel
An axial flow turbine wheel