Deep Bar & Double Cage Rotor in Three Phase Induction Motor - MCQs with Answers

Deep Bar & Double Cage Rotor in Three Phase Induction Motor - MCQs with Answers

Q1. In a slip ring induction motor, the rotor resistance is

a. High during starting and low at normal operating speed
b. Low at starting and high at normal operating speed
c. Remains same during starting and normal operating speed
d. None of these

View Answer / Hide Answer

Q2. Deep bar or double cage rotors are used in squirrel cage induction motor to obtain

a. High starting current
b. High starting torque
c. Reduced starting current
d. Reduced rotor resistance

View Answer / Hide Answer

Q3. Deep bar or double cage rotors make use of skin effect. The skin effect depends upon

a. Nature of material
b. Diameter of wire
c. Shape of wire and frequency
d. All of these

View Answer / Hide Answer

Q4. In deep bar induction motor, the rotor consists of deep bars, short circuited by two end rings one on each side. The leakage inductance of bottom strip

a. Greater than that of top strip
b. Lesser than that of top strip
c. Equal to that of top strip
d. None of these

View Answer / Hide Answer

Q5. The skin effect in a deep bar induction motor is maximum when rotor is

a. At standstill
b. Running at its maximum speed
c. Running at no load
d. Running at half load

View Answer / Hide Answer

Q6. In double cage induction motor, the rotor consists of two cages or two layers of bars short circuited by end rings. The upper cage and lower cage respectively has

a. High resistance and low reactance, high resistance and low reactance
b. High resistance and low reactance, low resistance and high reactance
c. Low resistance and high reactance, high resistance and low reactance
d. Low resistance and high reactance, low resistance and high reactance

View Answer / Hide Answer