Welcome to the Transformers MDCAT MCQs with Answers. In this post, we have shared Transformers Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Physics offers a chance to enhance your knowledge regarding Transformers MCQs in this MDCAT Online Test.
Transformers MDCAT MCQs Test Preparations
What is the primary function of a transformer?
a) Convert AC to DC
b) Change the voltage level
c) Store electrical energy
d) Increase the current
Which principle does a transformer operate on?
a) Ohm’s Law
b) Faraday’s Law of Electromagnetic Induction
c) Kirchhoff’s Law
d) Coulomb’s Law
In a transformer, what does the primary coil do?
a) Receives electrical power
b) Converts AC to DC
c) Delivers electrical power
d) Adjusts the power factor
What is the function of the secondary coil in a transformer?
a) Transfer energy to the primary coil
b) Convert DC to AC
c) Provide the output voltage
d) Control the current flow
The ratio of the primary voltage to the secondary voltage in a transformer is equal to:
a) The resistance ratio
b) The capacitance ratio
c) The turns ratio
d) The frequency ratio
In an ideal transformer, what is the power in the primary coil compared to the power in the secondary coil?
a) Greater
b) Less
c) Equal
d) Zero
What is the core material typically used in transformers?
a) Copper
b) Aluminum
c) Silicon steel
d) Plastic
The efficiency of a transformer is given by the ratio of:
a) Output voltage to input voltage
b) Output power to input power
c) Input current to output current
d) Primary voltage to secondary current
In a step-up transformer, the secondary voltage is:
a) Higher than the primary voltage
b) Lower than the primary voltage
c) Equal to the primary voltage
d) Unchanged
In a step-down transformer, the secondary current is:
a) Higher than the primary current
b) Lower than the primary current
c) Equal to the primary current
d) Unchanged
The voltage transformation ratio in a transformer is directly proportional to:
a) The number of turns in the secondary coil
b) The current in the primary coil
c) The power factor
d) The frequency of the input signal
Which type of transformer is used to match impedances in audio systems?
a) Power transformer
b) Isolation transformer
c) Audio transformer
d) Autotransformer
The primary purpose of an isolation transformer is to:
a) Increase voltage
b) Decrease voltage
c) Provide electrical isolation
d) Convert AC to DC
What type of transformer has only one winding used for both primary and secondary functions?
a) Power transformer
b) Isolation transformer
c) Autotransformer
d) Pulse transformer
Which of the following affects the efficiency of a transformer?
a) Core losses
b) Copper losses
c) Load losses
d) All of the above
The core of a transformer is laminated to:
a) Reduce eddy current losses
b) Increase core resistance
c) Improve cooling
d) Enhance magnetic flux
In a transformer, the term “magnetizing current” refers to:
a) The current required to establish the magnetic field
b) The current flowing through the load
c) The current that heats the core
d) The current that causes voltage drop
Which of the following is NOT a type of transformer?
a) Power transformer
b) Step-up transformer
c) Step-down transformer
d) Capacitor transformer
In a transformer, the voltage regulation refers to:
a) The ability to maintain constant voltage under varying load conditions
b) The adjustment of output voltage
c) The change in core material
d) The increase in transformer size
If the primary coil has 100 turns and the secondary coil has 50 turns, the transformer is a:
a) Step-up transformer
b) Step-down transformer
c) Isolation transformer
d) Auto transformer
In a transformer, the power factor is:
a) The ratio of primary voltage to secondary voltage
b) The ratio of secondary current to primary current
c) The ratio of real power to apparent power
d) The efficiency of the transformer
Which of the following is a common application of transformers?
a) Electrical isolation
b) Voltage regulation
c) Power distribution
d) All of the above
A transformer with a high turns ratio is used to:
a) Step up voltage
b) Step down voltage
c) Provide isolation
d) Increase current
The term “impedance matching” in transformers refers to:
a) Ensuring the input and output impedances are equal
b) Adjusting the voltage level
c) Reducing core losses
d) Matching frequency of operation
Which type of transformer is used to convert electrical power between different frequency ranges?
a) Isolation transformer
b) Audio transformer
c) Power transformer
d) Frequency transformer
Which of the following is true about a transformer’s core losses?
a) They are constant regardless of load
b) They increase with load
c) They are negligible compared to copper losses
d) They decrease with frequency
The primary winding of a transformer is connected to:
a) The input voltage source
b) The output load
c) The secondary winding
d) The core
The voltage in a transformer is stepped up when:
a) The number of turns in the secondary coil is less than in the primary coil
b) The primary coil has fewer turns than the secondary coil
c) The core material is changed
d) The frequency of the input signal is reduced
In a transformer, the term “load” refers to:
a) The electrical demand placed on the secondary coil
b) The magnetic field strength
c) The number of turns in the coil
d) The core material used
The efficiency of a transformer is typically:
a) Less than 50%
b) Around 90-99%
c) 100%
d) Variable depending on the load
Which part of a transformer can be considered a “magnetic coupling” element?
a) Primary winding
b) Secondary winding
c) Core
d) Insulation
In a transformer, what is the effect of increasing the core size?
a) Decreases efficiency
b) Increases core losses
c) Reduces core losses and improves efficiency
d) Increases the voltage output
Which of the following is NOT a type of transformer core construction?
a) Shell type
b) Core type
c) Frame type
d) Toroidal type
The term “flux linkage” in a transformer refers to:
a) The magnetic flux passing through a coil
b) The electrical current flowing through the coil
c) The resistance of the coil
d) The number of turns in the coil
Which of the following components in a transformer reduces the risk of electrical arcing?
a) Core
b) Insulation
c) Windings
d) Cooling system
Transformers are generally classified based on:
a) The type of core material used
b) The number of windings
c) The type of cooling system
d) The voltage rating
Which of the following is a characteristic of a power transformer?
a) Used in low voltage applications
b) Designed for high voltage and high power
c) Typically small and portable
d) Used primarily in electronic circuits
In a transformer, the primary and secondary windings are:
a) Connected in series
b) Connected in parallel
c) Magnetically coupled
d) Electrically connected
What happens to the current in the secondary coil when using a step-up transformer?
a) It increases
b) It decreases
c) It remains the same
d) It fluctuates
Which type of transformer is commonly used in power distribution systems?
a) Isolation transformer
b) Power transformer
c) Audio transformer
d) Pulse transformer
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