Index

Power-TransformerTransformer_Interview_Question

MCQ of Transformer page-1


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1.The main purpose of using core in transformer is to

a) Decrease reluctance of the common magnetic circuit
b) Decrease iron losses
c) Prevent hysteresis loses
d) Prevent eddy current losses

Ans: (a)

2. Transformer works on the principle of

a) Self induction
b) Mutual induction
c) Faraday’s law of electromagnetic induction
d) Self and mutual induction both

Ans: (d)

3. If dc voltage is applied to the primary of a transformer it may

a) Work
b) Burn the winding
c) Not work
d) Give lower voltage on the secondary side

Ans: (b)

4. Which of the following will improve the mutual coupling between primary and secondary of a transformer ?

a) Transformer oil of high breakdown voltage
b) Winding material of high resistivity
c) High reluctance magnetic core
d) Low reluctance magnetic core

Ans: (d)

5. Which type of core is used for a high-frequency transformer

a) Open iron core
b) Air core
c) Closed iron core
d) None of these

Ans: (b)

6. Transformer oil used in transformer provides

a) Insulation and cooling
b) Cooling and lubrication
c) Lubrication and insulation
d) Insulation, cooling and lubrication

Ans: (a)

7. Enamel layer is coated over the lamination of a transformer core to

a) Attain adhesion between the lamination
b) Prevent corrosion of laminations
c) Decrease the hum
d) Insulate the lamination from each other

Ans: (d)

8. The primary and secondary induced emfs E1and E2 in two-winding transformer are always

a) Antiphase with each other
b) In phase with each other
c) Equal in magnitude
d) Determined by load on transformer secondary

Ans: (b)

9. An step-up transformer increases

a) Current
b) Frequency
c) Voltage
d) Power

Ans: (c)

10. Eddy current losses in a transformer core may be reduced by

a) Reducing the air gap in the magnetic circuit
b) Reducing the thickness of lami-nations
c) Increasing the thickness of lami-nations
d) Increasing the gap in the magnetic circuit

Ans: (b)


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  445. Objective Questions & Answers of Circuit Breaker page-9
  446. Objective Questions & Answers of Circuit Breaker page-10
  447. Objective Questions & Answers of Circuit Breaker page-11
  448. Objective Questions & Answers of Circuit Breaker page-12
  449. Objective Questions & Answers of Circuit Breaker page-13
  450. Objective Type Questions or MCQ of Induction Motors page-1
  451. Objective Type Questions or MCQ of Induction Motors page-2
  452. Objective Type Questions or MCQ of Induction Motors page-3
  453. Objective Type Questions or MCQ of Induction Motors page-4
  454. Objective Type Questions or MCQ of Induction Motors page-5
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  456. Objective Type Questions or MCQ of Induction Motors page-7
  457. Objective Type Questions or MCQ of Induction Motors page-8
  458. Objective Type Questions or MCQ of Induction Motors page-9
  459. Objective Type Questions or MCQ of Induction Motors page-10
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  464. Objective Type Questions or MCQ of Induction Motors page-15
  465. Objective Type Questions or MCQ of Induction Motors page-16
  466. Objective Type Questions or MCQ of Induction Motors page-17
  467. Objective Type Questions or MCQ of Induction Motors page-18
  468. Objective Type Questions or MCQ of Induction Motors page-19
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  470. Objective Type Questions or MCQ of Induction Motors page-21
  471. Objective Type Question or MCQ of Synchronous Motors page-1
  472. Objective Type Question or MCQ of Synchronous Motors page-2
  473. Objective Type Question or MCQ of Synchronous Motors page-3
  474. Objective Type Question or MCQ of Synchronous Motors page-4
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  476. Objective Type Question or MCQ of Synchronous Motors page-6
  477. Objective Type Question or MCQ of Synchronous Motors page-7
  478. Objective Type Question or MCQ of Synchronous Motors page-8
  479. Objective Type Question or MCQ of Synchronous Motors page-9
  480. Objective Type Question or MCQ of Synchronous Motors page-10
  481. Objective Type Question or MCQ of Synchronous Motors page-11
  482. Objective Type Question or MCQ of Synchronous Motors page-12
  483. Objective Type Question or MCQ of Synchronous Motors page-13
  484. Multiple Choice Question (MCQ) of Materials page-1
  485. Multiple Choice Question (MCQ) of Materials page-2
  486. Multiple Choice Question (MCQ) of Materials page-3
  487. Multiple Choice Question (MCQ) of Materials page-4
  488. Multiple Choice Question (MCQ) of Materials page-5
  489. Multiple Choice Question (MCQ) of Materials page-6
  490. Multiple Choice Question (MCQ) of Materials page-7
  491. Multiple Choice Question (MCQ) of Materials page-8
  492. Multiple Choice Question (MCQ) of Materials page-9
  493. Multiple Choice Question (MCQ) of Materials page-10
  494. Multiple Choice Question (MCQ) of Materials page-11
  495. Multiple Choice Question (MCQ) of Materials page-12
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  497. Multiple Choice Question (MCQ) of Materials page-14
  498. Multiple Choice Question (MCQ) of Materials page-15
  499. Multiple Choice Question (MCQ) of Materials page-16
  500. Multiple Choice Question (MCQ) of Materials page-17
  501. Multiple Choice Question (MCQ) of Materials page-18
  502. Multiple Choice Question (MCQ) of Materials page-19
  503. Multiple Choice Question (MCQ) of Materials page-20
  504. Multiple Choice Question (MCQ) of Materials page-21
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  508. Multiple Choice Question (MCQ) of Materials page-25
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  518. Multiple Choice Question (MCQ) of Materials page-35
  519. Multiple Choice Question (MCQ) of Power Generation page-1
  520. Multiple Choice Question (MCQ) of Power Generation page-2
  521. Multiple Choice Question (MCQ) of Power Generation page-3
  522. Multiple Choice Question (MCQ) of Power Generation page-4
  523. Multiple Choice Question (MCQ) of Power Generation page-5
  524. Multiple Choice Question (MCQ) of Power Generation page-6
  525. Multiple Choice Question (MCQ) of Power Generation page-7
  526. Multiple Choice Question (MCQ) of Power Generation page-8
  527. Multiple Choice Question (MCQ) of Power Generation page-9
  528. Multiple Choice Question (MCQ) of Power Generation page-10
  529. Multiple Choice Question (MCQ) of Power Generation page-11
  530. Multiple Choice Question (MCQ) of Power Generation page-12
  531. Multiple Choice Question (MCQ) of Transmission and Distribution page-1
  532. Multiple Choice Question (MCQ) of Transmission and Distribution page-2
  533. Multiple Choice Question (MCQ) of Transmission and Distribution page-3