# Blondel's Two Reaction Theory - Salient Pole Machine Theory - MCQs with answers

## Blondel's Two Reaction Theory - Salient Pole Machine Theory - MCQs with answers

Q1. Blondel’s two reaction theory which gives the method of analysis of disturbing effects caused by

a. Salient pole construction
b. Non salient pole construction
c. Both (a) and (b)
d. None of these

ANSWER: a. Salient pole construction

Q2. According to Blondel’s two reaction theory the armature mmf is divided into components, direct axis component and quadrature axis component. The component acting along quadrature axis is

a. Magnetizing
b. Demagnetizing
c. Cross magnetizing
d. None of these

ANSWER: c. Cross magnetizing

Q3. According to Blondel’s two reaction theory, the armature mmf component acting along direct axis can be

a. Demagnetizing
b. Magnetizing
c. Cross magnetizing
d. Either (a) or (b)

ANSWER: d. Either (a) or (b)

Q4. The reluctance offered to the mmf wave is lowest when

a. It is aligned with the field pole axis
b. It is oriented at 90 degree to the field pole axis
c. Both (a) and (b)
d. None of the above

ANSWER: a. It is aligned with the field pole axis

Q5. In Blondel’s two reaction theory, if Ia is armature current per phase, Ra is armature resistance, Xd is direct axis synchronous reactance, Xq is quadrature axis synchronous reactance and V is the terminal voltage, then the voltage in phase with direct axis will be

a. V + IaRa + Ia Xd
b. V + IaRa + IaXq
c. V + IaXd + IaXq
d. V + IaRa + IaXd + IaXq