A. Transfer of electrical energy from circuit to another
B. Step Up the voltage
C. Step Down the voltage
D. All of the above
Answer
D. All of the above
Explanation:
- A transformer is defined as a static device that changes the level of voltage between circuits.
- The transformer is basically a voltage control device that is used widely in the distribution and transmission of alternating current power.
- The function of the transformer, as the name implies, is to transform alternating current energy from one voltage to another voltage.
- When energy is transformed to a higher voltage the transformer is called a step-up transformer and energy is transformed to a low voltage the transformer is called a step-down transformer.
- If the power varies the current varies while the voltage remains fairly constant.
A transformer carries the below operations:
- Transfer of electrical energy from circuit to another
- Transfer of electrical power through electromagnetic induction
- Electric power transfer without any change in frequency
- Two circuits are linked with mutual induction.
Power System MCQs With Explanation
- The advantages of high transmission voltage are
- The charging current drawn by the cable is
- The fact that current density is higher at the surface when compared to the center is known as
- In which of the following transmission lines capacitance effect is negligible?
- The distribution constant of the transmission line is
- Proximity effect is more in case of
- If the frequency is increased, then the skin effect will
- Bundled conductors in EHV transmission lines help in
- Which of the following produces radio interference in communication lines?
- Telecommunication lines are transposed to reduce the
- What is the function of economizer in Thermal Power Plant
- Which of the following effects are associated with transmission line
- The insulator thickness on the conductor, in cables, depends upon
- By using a guard ring in a transmission line, its string efficiency
- If sag in an overhead line increase, the tension in the line
- Corona is accompanied by
- The conductor carries more current on the surface as compared to the core. This is called as
- Critical disruptive voltage is a voltage at which
- Bundled conductors are used for EHV transmission lines primarily for reducing the
- Low power factor is usually not due to
- Bonding is done at both ends of the cable to reduce the
- For Improving power factor
- Stock bridge dampers are used to
- Which of the following insulator is practically used for railway crossings?
- Which of the following decides the insulation level of 400 kV, EHV line?
- When earth fault occurs
- The minimum length of pipe electrode used for earthing should not be less than
- A ground wire is used to
- Earth resistance in typical domestic wiring is
- By which of the following systems electric power may be transmitted?
- Which of the following equipment will be most economical for regulating the voltage in the distribution feeder?
Transformer MCQs With Explanation
- In a transformer the primary flux is
- The noise of the transformer is mainly due to
- Buchholz relay is used for the protection
- Iron loss in a transformer can be determined by
- Oil is provided in an oil-filled transformer for
- In a star-delta transformer, the delta side phase voltage leads the star sides phase voltage by an angle
- Minimum voltage regulation occurs in transformer when the power factor of the load is
- The chemical used in the breather of a transformer should have the property of
- The power transformer can be termed as a constant
- In a transformer, which of the following losses are zero?
- Which of the following Transformer can have a tap changer?
- If the supply frequency (f) of a transformer decreases, the effect of frequency on the transformer's secondary output voltage?
- The primary winding of a transformer has a 120 V ac supply. What is the value of secondary voltage if the turn ratio is 10?
- The efficiency of a power transformer is _____ at full load.
- In a transformer the relation between the input frequency and the output voltage on secondary winding is _____.
- In a current transformer, _____ winding is closed.
- A transformer is a _____ device.
- A step-down transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
- A step-up transformer has _____ number of turns on primary winding and _____ number of turns on the secondary winding.
- Transformer works on ______ principle.
- Shell Type Transformer is mainly used for
- A Magnetic Oil level Guage (MOG) is used in the Transformer to
- The Function Of Power Transformer is/are
- The Radiators are used in transformers for
Synchronous Motor MCQs With Explanation
- In 3 -Φ synchronous motor if one of the phases is short-circuited the motor will
- The speed regulation of a synchronous motor is
- The negative phase sequence in a three-phase synchronous motor exists when the motor is
- What happens if the field winding of the synchronous motor is short-circuited?
- For power factor correction, synchronous motors operate at
Induction Motor MCQs With Explanation
- In a capacitor start and run the motor the function of the running capacitor in series with the auxiliary winding is to
- A split-phase motor has
- If the capacitor of a single-phase motor is short-circuited
- In a split-phase motor, the running winding should have