a) Transformer is a device used to convert low alternating voltage to a high alternating voltage
b) Transformer is a device used to convert alternating current to direct current
c) Transformer is a device used to convert low alternating current to a high alternating current
d) Transformers are used only for low alternating voltage
Q.2.
What is the function of a transformer?
a) Transformer is used to step down or up the AC voltages and currents
b) Transformer is used to step down or up the DC voltages and currents
c) Transformer converts DC to AC voltages
d) Transformer converts AC to DC voltages
Q.3.
What is the working principle of a Transformer?
a) Transformer works on the principle of self induction
b) Transformer works on the principle of mutual induction
c) Transformer works on the principle of ampere law
d) Transformer works on the principle of coulomb law
Q.4.
Transformer ratings are given in _____________
a) kVA
b) HP
c) kVAR
d) kW
Q.5.
What is the current transformer?
a) transformer used with an A.C. voltmeter
b) transformer used with an A.C. ammeter
c) transformer used with an D.C. voltmeter
d) transformer used with an D.C. ammeter
Q.6.
Current transformers are __________________
a) parallel connected type of instrument transformers
b) series connected type of instrument transformers
c) parallel connected normal transformers
d) series-parallel connected type of instrument transformers
Q.7.
Which of the following is not a part of transformer installation?
a) Breather
b) Conservator
c) Exciter
d) Buchholz relay
Q.8.
Transformer core is generally made of ___________
a) Cannot be determined
b) Can be made with any of the above method
c) By stacking large number of sheets together
d) Single block of core material
Q.9.
The purpose of the transformer core is to provide ____________
a) Low reluctance path
b) High inductive path
c) High capacitive path
d) High reluctance path
Q.10.
Transformers are generally designed for ___________
a) one-time use
b) off-site problem solving
c) short-time use
d) on-site problem solving
Q.11.
What is the thickness of laminations used in a transformer?
a) 14 mm to 15 mm
b) 25 mm to 40 mm
c) 0.1 mm to 0.5 mm
d) 4 mm to 5 mm
Q.12.
Which type of flux does transformer action need?
a) Alternating electric flux
b) Alternating magnetic flux
c) Increasing magnetic flux
d) Constant magnetic flux
Q.13.
Primary winding of a transformer ______________
a) Could either be a low voltage or high voltage winding
b) Is always a high voltage winding
c) Cannot be determined
d) Is always a low voltage winding
Q.14.
Which of the following transformer, Buchholz’s relay can be fixed on?
a) Welding transformers
b) Oil cooled transformers
c) Auto-transformers
d) Air-cooled transformers
Q.15.
What is the function of a breather in a transformer?
a) To arrest flow of moisture when outside air enters the transformer
b) To cool the transformer oil
c) To provide oxygen inside the tank
d) To cool the coils during reduced load
Q.16.
An ideal transformer will have maximum efficiency at a load such that _____________
a) copper loss > iron loss
b) cannot be determined
c) copper loss = iron loss
d) copper loss < iron loss
Q.17.
Which transformer insulation material is best compare to Kraft paper?
a) Asbestos
b) Oil
c) Cotton
d) Low grade pressboard
Q.18.
For a transformer with primary turnssecondary turnsifcurrent is flowing through primary, we will get ___________
a) 800A at secondary
b) 40A at secondary
c) 80A at secondary
d) 5A at secondary
Q.19.
AKVA transformer is constructed to a turns ratio of N1/N2 =The impedance of primary winding is 3+j5 ohms and of secondary winding is 0.5+j0.8 ohms. What will be the impedance of transformer when referred to primary?
a) 53 + 85j ohms
b) 53j + 85 ohms
c) Can’t be calculated
d) 3.5 + 5.8j ohms
Q.20.
The full-load copper loss of a transformer isW. At half-load, the copper loss will be _______
a) 1600 W
b) 6400 W
c) 400 W
d) 800 W
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