3B2 Chapter 5 Questions With Complete Solutions
(3B2-C-05-20) Electric starters on a gas turbine consist of an
_______ motor and a variable frequency drive.
Select one:
a.
synchronous
b.
AC
c.
DC
b
(3B2-C-05-27) The main difference between the hydraulic oil
system and the lubrication oil system is:
A.
the hydraulic oil system will operate only when the gas turbine
is running at full load.
B.
there will be no real differences between the two.
C.
the hydraulic oil system will operate at a higher pressure.
D.
the lube oil system will be at a higher temperature.
E.
the lube oil system will be at a higher pressure.
C
,(3B2-C-05-24) A thermostatically controlled heater is included
in the lube oil system to:
A.
keep the operating temperature of the oil at or above 100o C to
ensure good lubrication.
B.
keep the oil at the correct temperature so it will lubricate the
antifriction bearings more efficiently.
C.
ensure that the viscosity of the oil is high enough to supply
boundary lubrication of the bearings.
D.
maintain a minimum operating temperature so filters work more
efficiently.
E.
ensure a minimum lube oil temperature is maintained at all times
so the system can be started up quickly.
E
(3B2-C-05-19) Fast shutdowns on gas turbines are normal
because of the rapid cool downs it entails.
Select one:
A. True
B. False
B
(3B2-C-05-35) To reduce the potential for shaft bowing caused
by uneven cool down of the gas turbine, a ______________
_______________ is used.
, A.
starting motor
B.
turning gear
C.
reduction unit
D.
hydraulic ratchet
E.
rotating gear
B
(3B2-C-05-44) The best method for cleaning compressor
blading on large gas turbines is:
A.
off line sand blasting.
B.
carbo-blasting with walnut shells or rice.
C.
on line water washing.
D.
off line bead blasting.
E.
off line water washing.
E
(3B2-C-05-31) Decreasing the fuel to air ratio in the combustor
tends to decrease the CO generation but increases the NOx
generation.
(3B2-C-05-20) Electric starters on a gas turbine consist of an
_______ motor and a variable frequency drive.
Select one:
a.
synchronous
b.
AC
c.
DC
b
(3B2-C-05-27) The main difference between the hydraulic oil
system and the lubrication oil system is:
A.
the hydraulic oil system will operate only when the gas turbine
is running at full load.
B.
there will be no real differences between the two.
C.
the hydraulic oil system will operate at a higher pressure.
D.
the lube oil system will be at a higher temperature.
E.
the lube oil system will be at a higher pressure.
C
,(3B2-C-05-24) A thermostatically controlled heater is included
in the lube oil system to:
A.
keep the operating temperature of the oil at or above 100o C to
ensure good lubrication.
B.
keep the oil at the correct temperature so it will lubricate the
antifriction bearings more efficiently.
C.
ensure that the viscosity of the oil is high enough to supply
boundary lubrication of the bearings.
D.
maintain a minimum operating temperature so filters work more
efficiently.
E.
ensure a minimum lube oil temperature is maintained at all times
so the system can be started up quickly.
E
(3B2-C-05-19) Fast shutdowns on gas turbines are normal
because of the rapid cool downs it entails.
Select one:
A. True
B. False
B
(3B2-C-05-35) To reduce the potential for shaft bowing caused
by uneven cool down of the gas turbine, a ______________
_______________ is used.
, A.
starting motor
B.
turning gear
C.
reduction unit
D.
hydraulic ratchet
E.
rotating gear
B
(3B2-C-05-44) The best method for cleaning compressor
blading on large gas turbines is:
A.
off line sand blasting.
B.
carbo-blasting with walnut shells or rice.
C.
on line water washing.
D.
off line bead blasting.
E.
off line water washing.
E
(3B2-C-05-31) Decreasing the fuel to air ratio in the combustor
tends to decrease the CO generation but increases the NOx
generation.
