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Electrical Electronics Engineering
1000 Transformers
Quiz 2
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Q.1
Power transformers other than distribution transformers are generally designed to have maximum efficiency around ______
a) 10% overload
b) Near full-load
c) Half-load
d) No-load
Q.2
For a power transformer operating at full load it draws voltage and current equal toV andA respectively at 0.8 pf. Iron and copper losses are equal tokW and 300kW. What is efficiency?
a) 97.44%
b) 99.12%
c) 86.44%
d) 96.44%
Q.3
Voltage regulation of transformer is given by _____________
a) V2-E2/E2
b) V2-E2/V2
c) E2-V2/V2
d) E2-V2/E2
Q.4
No-load current in the transformer is _______
a) Sinusoidal distorted
b) Sinusoidal
c) Steps
d) Straight DC
Q.5
Which of the following is the main advantage of an auto-transformer over a two-winding transformer?
a) Eddy losses are totally eliminated
b) Copper losses are negligible
c) Saving in winding material
d) Hysteresis losses are reduced
Q.6
For a 20kVA transformer with a turn ratio of 0.4 what amount of total power is transferred inductively?
a) 10kVA
b) 8kVA
c) 50kVA
d) 12kVA
Q.7
Which of the following is the major requirement for the transformers used for electronic purposes?
a) Constant amplitude voltage gain
b) Perfect DC isolation, maximum efficiency and constant voltage gain
c) Perfect DC isolation
d) Maximum efficiency
Q.8
Which type of winding is used in 3-phase shell-type transformer?
a) Cylindrical type
b) Circular type
c) Rectangular type
d) Sandwich type
Q.9
Why shell type 3-phase transformer is used in large power transforming applications?
a) Due to other reasons
b) More height and less height flexibility
c) Can be made with less height
d) Can be made with more height
Q.10
Which of the following is not a routine test for transformers?
a) Polarity test
b) Radio interference test
c) Core insulation voltage test
d) Impedance test
Q.11
What will happen if the secondary of a current transformer is open-circuited?
a) depends on other parameters
b) cool as there is no secondary current
c) hot because primary will carry heavy current
d) hot because of heavy iron losses
Q.12
Welding transformers work on principle that weld is actually __________________
a) open circuit
b) short circuit
c) circuit with finite resistance
d) circuit with finite reactance
Q.13
Insulation of HVDC transformers should be ___________
a) no need of insulation
b) can be dry or wet
c) wet always
d) dry always
Q.14
Core flux in the transformer is _______________
a) square wave
b) triangular
c) sinusoidal
d) flat-topped
Q.15
For a transformer with primary turnssecondary turnsifV is applied at primary we will get ___________
a) 3200 V at secondary
b) 1600 V at secondary
c) 800 V at secondary
d) 80 V at secondary
Q.16
For a transformer given ofkVA, 220/6000-V transformer, short circuit test is performed. What current rating is needed?
a) 445A
b) 40A
c) 60A
d) 30A
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