Steam and Gas Turbines Multiple Choice Questions on “Emergency Governors”.
1. Only some special steam turbines used for special purposes are provided with emergency governors.
a) True
b) False
Answer: b
Clarification: Every steam turbine is provided with an emergency governor.
2. When the speed of the shaft is increased by ________ emergency governors starts.
a) 95%
b) 110%
c) 100%
d) 90%
Answer: b
Clarification: When the speed of the governor is 110% then emergency governors starts working.
3. When balancing of turbine is disturbed _______________
a) Emergency governor starts
b) Governor shuts down
c) Emergency governor starts & Governor shuts down
d) None of the mentioned
Answer: a
Clarification: When balancing of turbines is disturbed, emergency governor starts working.
4. When lubrication system fails _______
a) Turbine shuts down
b) Emergency governor starts
c) Turbine shuts down & Emergency governor starts
d) None of the mentioned
Answer: b
Clarification: When lubrication system fails emergency governor fails.
5. Emergency governor starts working when condenser vacuum is ___________
a) less
b) more
c) medium
d) none of the mentioned
Answer: a
Clarification: When turbine vacuum is reduced emergency governor starts working.
6. When coolant supply is inadequate to condenser ____________
a) Emergency governor starts
b) Condenser instantly shuts down
c) Emergency governor starts & Condenser instantly shuts down
d) None of the mentioned
Answer: a
Clarification: When coolant supply to condenser is inadequate emergency governor starts.
7. Emergency governor starts when _____________
a) Lubrication system fails
b) Turbine balance is disturbed
c) Speed is increased to 110%
d) All of the mentioned
Answer: d
Clarification: Emergency governor starts when
Lubrication system fails
Turbine balancing is disturbed
Speed is increased to 110%.
8. How many governors are required for safe operation of the turbine?
a) 2
b) 1
c) 3
d) 4
Answer: a
Clarification: Two independent governors are required for safe operation. They are
Main governor
Emergency governor.
9. Speed regulation varies from ____________
a) 2.5%-5%
b) 3%-5%
c) 1%-5%
d) 1%-2%
Answer: a
Clarification: Speed regulation varies from 2.5%-5%.
10. Overspeed test for turbine can be done by ____ methods.
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: Overspeed test can be done by two methods. They are
DEH dielectric test
Mechanical Test.