This set of Transformers Multiple Choice Questions & Answers (MCQs) focuses on “Distribution Transformers”. 1. Distribution transformers are generally designed for maximum efficiency around __________ a) 90% load b) zero load c) 25% load d) 50% load 2. In a power or distribution transformer about 10 per cent end turns are heavily insulated _______________ a) … Read more
This set of Transformers MCQs focuses on “Transformers for HVDC Conversion”. 1. HVDC transformers are used widely _____________ a) for transmission purpose b) for generation purpose c) for supplying DC machines d) for every use of transformer 2. HVDC converter transformers are generally __________________ a) unidirectional b) didirectional c) nondirectional d) multidirectional 3. Insulation of … Read more
This set of Transformers Multiple Choice Questions & Answers focuses on “Generator and Power Station Transformers”. 1. Generator transformers are ________________ a) Step-up transformers b) Step-down transformers c) Auto-transformers d) One-one transformers 2. In the CCGT, how many step-up transformers will require? a) 3 b) 4 c) 5 d) 6 3. Which of the following … Read more
This set of Transformers online test focuses on “Operation under Abnormal Conditions”. 1. Increased transformer insulation stresses are due to _______________ a) third harmonic currents b) third harmonic voltages c) fifth harmonic currents d) fifth harmonic voltages 2. Overheating of transformer windings and of load are due to ________ a) third harmonic currents b) third … Read more
This set of Transformers Multiple Choice Questions & Answers (MCQs) focuses on “Transformer Maintenance”. 1. In how many types transformers can be used with relay protection system? a) 5 b) 10 c) 2 d) Many 2. Ingress of air into the oil tank can be avoided by using ___________ a) relays b) plastic coatings c) … Read more
This set of Transformers Multiple Choice Questions & Answers (MCQs) focuses on “Transformer Protection”. 1. Satisfactory parallel operation of transformers needs ______ a) 5 conditions b) many conditions c) 10 conditions d) 7 conditions 2. Voltmeter connected across two similar terminals of parallel operated transformers should give _______ a) 0 reading b) maximum reading c) … Read more
This set of Transformers Multiple Choice Questions & Answers (MCQs) focuses on “Noise in Transformers”. 1. If para magnetic core is used in the place of the ferromagnetic core of the transformer, then what will happen to magnetostriction? a) be vanished b) reduce c) increase d) not be affected 2. In which of the following … Read more
This set of Basic Transformers Questions and Answers focuses on “Neutral Earthing in Transformers”. 1. Categories for a transformer earthing of a system neutral are ___ a) 2 b) 3 c) 4 d) Many 2. Which of the following neutral earthing method is disadvantageous? a) Neutral solidly earthed b) Neutral earthed via an impedance c) … Read more
This set of Transformers Quiz focuses on “Transformers as Magnetically Coupled Circuits”. 1. Considering transformer as a magnetically coupled circuit, the voltage at the primary of the transformer is _________________ a) R1i1 + L1*di1/dt – M*di2/dt b) R1i1 + L1*di1/dt + M*di2/dt c) R1i1 – L1*di1/dt + M*di2/dt d) R1i1 – L1*di1/dt – M*di2/dt 2. … Read more
This set of Transformers Multiple Choice Questions & Answers (MCQs) focuses on “Grounding and Welding Transformer”. 1. When grounding transformer is employed? a) When neutral is available b) When neutral is not available c) When transformer of type Y/D is used d) Always 2. Grounding transformer is ______________ a) Step-up transformer b) Step-down transformer c) … Read more
