Q.1
• a) 11kV
• b) 33kV
• c) 66kV
• d) 122kV
Q.2
##### The maximum load that a power transformer can carry is limited because of its ___________
• a) temperature rise
• b) dielectric strength of oil
• c) voltage ratio
• d) copper loss
Q.3
##### The voltage transformation ratio of a transformer is defined as ratio of _____________
• a) primary turns to secondary turns
• b) secondary current to primary current
• c) secondary induced emf to primary induced emf
• d) secondary terminal voltage to primary applied voltage
Q.4
##### If a transformer is made to run on to a voltage which is more than the rated voltage _______________
• a) its power factor will deteriorate
• b) its power factor will increase
• c) its power factor will remain unaffected
• d) its power factor will be zero
Q.5
##### Which of the following equation correctly represents the exact phasor diagram of transformer?
• a) V1=E1+I1R1+jI1X1
• b) V1=E1+I1R1+jI2X2
• c) V2=E2+I1R1+jI1X1
• d) V1=E1-I1R1+jI1X1
Q.6
##### Approximate phasor diagram of a transformer is based on _____________
• a) V1=E1+I1R1+jI1X1
• b) V2=E2+I2R2+jI2X2
• c) V1=V2+IR+jIX
• d) V1=E1+I1R1+jI1X2
Q.7
• a) f and f2
• b) f2 and f
• c) f and f
• d) f2 and f2
Q.8
##### What will happen to hysteresis loss if voltage is doubled, load is doubled and frequency is halved?
• a) Will be twice
• b) Will be halved
• c) Will remain same
• d) Will be four times