Question 1

Which type of winding is used in 3phase shell-type transformer ?

Accepted Answer

A) Circular type 
B) Sandwich type 
C) Cylindrical type 
D) Rectangular type 
A) Circular type 
B) Sandwich type 
C) Cylindrical type 
D) Rectangular type

Question 2

The function of breather in a transformer is

Accepted Answer

A) to provide oxygen inside the tank 
B) to cool the coils during reduced load 
C) to cool the transformer oil 
D) to arrest flow of moisture when outside air enters thetr 
A) to provide oxygen inside the tank 
B) to cool the coils during reduced load 
C) to cool the transformer oil 
D) to arrest flow of moisture when outside air enters thetr

Question 3

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in

Accepted Answer

A) short-circuiting of the secondaries 
B) power factor of one of the trans¬formers is leading while that of the otherlagging 
C) transformers having higher copper losses will have negligible core losses 
D) loading of the tr 
A) short-circuiting of the secondaries 
B) power factor of one of the trans¬formers is leading while that of the otherlagging 
C) transformers having higher copper losses will have negligible core losses 
D) loading of the tr

Question 4

During open circuit test of a transformer

Accepted Answer

A) primary is supplied rated voltage 
B) primary is supplied full-load current 
C) primary is supplied current at reduced voltage 
D) primary is supplied rated kVA 
A) primary is supplied rated voltage 
B) primary is supplied full-load current 
C) primary is supplied current at reduced voltage 
D) primary is supplied rated kVA

Question 5

The transformer oil should have volatility and viscosity.

Accepted Answer

A) low,low 
B) high,high 
C) low,high 
D) high,low 
A) low,low 
B) high,high 
C) low,high 
D) high,low

Which type of winding is used in 3phase shell-type transformer ?

The function of breather in a transformer is

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in

During open circuit test of a transformer

The transformer oil should have volatility and viscosity.

Transformer Fundamentals and Operation

Transformer Technology and Design

Transformer: Resistance, Oil, Relays, Harmonics, and Core Properties

Transformers: Voltage Regulation, Efficiency, and Protection

Transformer and D.C Motor

D.C Motors and Starters

D.C Motors and Speed Control

D.C Motors and Controls

D.C Motors and Generators

D.C Machine and Generator Laminations, Commutation, and Components

D.C Generators and Commutators

D.C Generator Operation and Construction

D.C Generators

Direct Current Generators and Parallel Operation

Filters

Exam 4: Transformers: Efficiency, Design, and Testing

Which type of winding is used in 3phase shell-type transformer ?

The function of breather in a transformer is

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in

During open circuit test of a transformer

The transformer oil should have volatility and viscosity.

Transformer Fundamentals and Operation

Transformer Technology and Design

Transformer: Resistance, Oil, Relays, Harmonics, and Core Properties

Transformers: Voltage Regulation, Efficiency, and Protection

Transformer and D.C Motor

D.C Motors and Starters

D.C Motors and Speed Control

D.C Motors and Controls

D.C Motors and Generators

D.C Machine and Generator Laminations, Commutation, and Components

D.C Generators and Commutators

D.C Generator Operation and Construction

D.C Generators

Direct Current Generators and Parallel Operation

Filters