155404
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?
1 Generator
2 Motor
3 Transformer
4 Vibrator
Explanation:
C The definition of transformer state that It changes low voltage of high current into high voltage of low current and vice versa without change in frequency.
NDA (I) 2017
Alternating Current
155405
Step-up transformers are used for
1 increasing electrical power
2 decreasing electrical power
3 decreasing voltage
4 increasing voltage
Explanation:
D Step-up transformer are used to increase the voltage of an alternating current (AC) power source. They consist of two coils of wire wrapped around a magnetic core, where the coil with fewer turns is called the primary coil, and the coil with more turns is called the secondary coil.
NDA (II) 2017
Alternating Current
155408
The working of magnetic braking of trains is based on
1 eddy current
2 pulsating current
3 alternating current
4 steady current
Explanation:
A The working of magnetic braking of trains is based on eddy current.
Karnataka CET-2017
Alternating Current
155413
A transformer is employed to
1 obtain a suitable $\mathrm{DC}$ voltage
2 convert $D C$ to $A C$ voltage
3 obtain a suitable $\mathrm{AC}$ voltage
4 convert $A C$ to $D C$ voltage
Explanation:
C A transformer is employed to obtain a suitable $A C$ voltage, which means that it is being used to step-up (increases voltage from primary to secondary) or step down (decreases voltage from primary to secondary) the voltage from the input to the output.
155404
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?
1 Generator
2 Motor
3 Transformer
4 Vibrator
Explanation:
C The definition of transformer state that It changes low voltage of high current into high voltage of low current and vice versa without change in frequency.
NDA (I) 2017
Alternating Current
155405
Step-up transformers are used for
1 increasing electrical power
2 decreasing electrical power
3 decreasing voltage
4 increasing voltage
Explanation:
D Step-up transformer are used to increase the voltage of an alternating current (AC) power source. They consist of two coils of wire wrapped around a magnetic core, where the coil with fewer turns is called the primary coil, and the coil with more turns is called the secondary coil.
NDA (II) 2017
Alternating Current
155408
The working of magnetic braking of trains is based on
1 eddy current
2 pulsating current
3 alternating current
4 steady current
Explanation:
A The working of magnetic braking of trains is based on eddy current.
Karnataka CET-2017
Alternating Current
155413
A transformer is employed to
1 obtain a suitable $\mathrm{DC}$ voltage
2 convert $D C$ to $A C$ voltage
3 obtain a suitable $\mathrm{AC}$ voltage
4 convert $A C$ to $D C$ voltage
Explanation:
C A transformer is employed to obtain a suitable $A C$ voltage, which means that it is being used to step-up (increases voltage from primary to secondary) or step down (decreases voltage from primary to secondary) the voltage from the input to the output.
155404
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?
1 Generator
2 Motor
3 Transformer
4 Vibrator
Explanation:
C The definition of transformer state that It changes low voltage of high current into high voltage of low current and vice versa without change in frequency.
NDA (I) 2017
Alternating Current
155405
Step-up transformers are used for
1 increasing electrical power
2 decreasing electrical power
3 decreasing voltage
4 increasing voltage
Explanation:
D Step-up transformer are used to increase the voltage of an alternating current (AC) power source. They consist of two coils of wire wrapped around a magnetic core, where the coil with fewer turns is called the primary coil, and the coil with more turns is called the secondary coil.
NDA (II) 2017
Alternating Current
155408
The working of magnetic braking of trains is based on
1 eddy current
2 pulsating current
3 alternating current
4 steady current
Explanation:
A The working of magnetic braking of trains is based on eddy current.
Karnataka CET-2017
Alternating Current
155413
A transformer is employed to
1 obtain a suitable $\mathrm{DC}$ voltage
2 convert $D C$ to $A C$ voltage
3 obtain a suitable $\mathrm{AC}$ voltage
4 convert $A C$ to $D C$ voltage
Explanation:
C A transformer is employed to obtain a suitable $A C$ voltage, which means that it is being used to step-up (increases voltage from primary to secondary) or step down (decreases voltage from primary to secondary) the voltage from the input to the output.
155404
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?
1 Generator
2 Motor
3 Transformer
4 Vibrator
Explanation:
C The definition of transformer state that It changes low voltage of high current into high voltage of low current and vice versa without change in frequency.
NDA (I) 2017
Alternating Current
155405
Step-up transformers are used for
1 increasing electrical power
2 decreasing electrical power
3 decreasing voltage
4 increasing voltage
Explanation:
D Step-up transformer are used to increase the voltage of an alternating current (AC) power source. They consist of two coils of wire wrapped around a magnetic core, where the coil with fewer turns is called the primary coil, and the coil with more turns is called the secondary coil.
NDA (II) 2017
Alternating Current
155408
The working of magnetic braking of trains is based on
1 eddy current
2 pulsating current
3 alternating current
4 steady current
Explanation:
A The working of magnetic braking of trains is based on eddy current.
Karnataka CET-2017
Alternating Current
155413
A transformer is employed to
1 obtain a suitable $\mathrm{DC}$ voltage
2 convert $D C$ to $A C$ voltage
3 obtain a suitable $\mathrm{AC}$ voltage
4 convert $A C$ to $D C$ voltage
Explanation:
C A transformer is employed to obtain a suitable $A C$ voltage, which means that it is being used to step-up (increases voltage from primary to secondary) or step down (decreases voltage from primary to secondary) the voltage from the input to the output.
