Steam and Gas Turbines Multiple Choice Questions on “Impulse Turbine Blade Profile”.
1. A ___________ drawn from the head of turbine blade to tail is called as chord.
a) straight line
b) curved axis
c) linear axis
d) none of the mentioned
Answer: a
Clarification: In blade profiles chord is a straight line drawn from head to the tail of turbine blade.
2. Angle between chord and turbine rotation is called as _________
a) blade angle
b) pitch angle
c) relative angle
d) none of the mentioned
Answer: b
Clarification: Angle between the chord and the turbine is called as pitch angle.
3. Angle between steam relative velocity and turbine rotation is called as _________
a) blade angle
b) pitch angle
c) relative angle
d) none of the mentioned
Answer: c
Clarification: Angle between steam relative velocity and turbine rotation is called as relative angle.
4. Relative angle can also be called as ______________
a) incidence angle
b) blade angle
c) pitch angle
d) none of the mentioned
Answer: a
Clarification: Relative angle is the angle at which steam is entering the turbine. It is the angle between relative velocity of steam and turbine. Hence relative angle is also called a incidence angle.
5. Angle between relative velocity of steam and chord is called as _________
a) blade angle
b) pitch angle
c) attack angle
d) relative angle
Answer: c
Clarification: Attack angle is the angle with which steam attacks the blade. Hence it is the angle between relative velocity of steam and chord of the blade.
6. Attack angle is the difference between angle of pitch and relative angle.
a) True
b) False
Answer: a
Clarification: It can be found theoretically by calculating the pitch angle and relative angle. The difference between pitch angle and relative angle is the attack angle.
7. The length of perpendicular line drawn from the highest point of the blade to the chord is called as ______
a) maximum thickness
b) maximum chamber
c) maximum chamber location
d) none of the mentioned
Answer: b
Clarification: Maximum chamber is the length of perpendicular line drawn from the highest point of the blade to the chord.
8. Maximum chamber is represented by ____________
a) m
b) c
c) p
d) none of the mentioned
Answer: a
Clarification: C is used to represent chord and p is used to represent maximum chamber location.
9. Maximum chamber location is represented by _______
a) m
b) c
c) p
d) none of the mentioned
Answer: c
Clarification: Maximum chamber location is represented by p.
10. Chord is represented by __________
a) m
b) c
c) p
d) none of the mentioned
Answer: b
Clarification: Chord is represented by C.