1) For controlling the initial inrush current,
a. Reduced voltage is applied to the stator during the starting period
b. Reduced voltage is applied to the stator when the motor is running at rated speed
c. Either (a) or (b)
d. None of these
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Answer
Explanation
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ANSWER: Reduced voltage is applied to the stator during the starting period
Explanation:
No explanation is available for this question!
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2) If induction motor is direct switched-on then it will develop
a. 1.5 times their full load torque
b. 1.5 to 2.5 times their full load torque
c. 2.5 times their full load torque
d. 1.5 to 5 times their full load torque
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Answer
Explanation
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ANSWER: 1.5 to 2.5 times their full load torque
Explanation:
No explanation is available for this question!
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3) In DOL fuses are provided to protect against
a. Short circuit protection
b. Over voltage
c. Over current
d. Over load
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Answer
Explanation
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ANSWER: Short circuit protection
Explanation:
No explanation is available for this question!
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4) In India, direct - on - line starter can be used for 3 - phase squirrel cage induction motor up to the rating of
a. 5 HP
b. 10 HP
c. 15 HP
d. 25 HP
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Answer
Explanation
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ANSWER: 5 HP
Explanation:
No explanation is available for this question!
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5) Reduced voltage can be applied across the stator circuit by
a. Using an autotransformer
b. Connecting resistor in series with stator winding
c. Connecting inductor in series with stator winding
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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6) If an induction motor is initially connected in delta and then reconnected in star then the current drawn will become
a. Thrice of the current drawn when connected in delta
b. Twice of the current drawn when connected in delta
c. One third of the current drawn when connected in delta
d. Half of the current drawn when connected in delta
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Answer
Explanation
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ANSWER: One third of the current drawn when connected in delta
Explanation:
No explanation is available for this question!
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7) 3 - point starter is used to start the
a. Series motor
b. Shunt motor
c. Compound motor
d. Only (b) and (c)
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Answer
Explanation
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ANSWER: Only (b) and (c)
Explanation:
No explanation is available for this question!
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8) In four - point starter, the no volt release is connected across the
a. Supply line through a protective resistance
b. In series with field circuit through a protective resistance
c. Either (a) or (b)
d. None of these
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Answer
Explanation
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ANSWER: Supply line through a protective resistance
Explanation:
No explanation is available for this question!
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9) The overload release protects the motor against
a. Over voltage
b. Over current
c. Over load
d. All of these
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Answer
Explanation
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ANSWER: Over load
Explanation:
No explanation is available for this question!
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10) If an extra resistance is connected in the rotor circuit of slip ring induction motor, then
a. Starting current and torque decreases
b. Starting current increases and torque decreases
c. Starting current decreases and torque increases
d. Starting current and torque increases
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Answer
Explanation
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ANSWER: Starting current decreases and torque increases
Explanation:
No explanation is available for this question!
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