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Browse complete papersAn electronic component that stores electrical energy in an electric field is known as a(n):
Diode
Inductor
Capacitor
Transistor
Correct answer
Diode
A 10 \(\mu F\) capacitor and a 20 \(\mu F\) capacitor are connected in parallel. This combination is then connected in series with a 30 \(\mu F\) capacitor. What is the total equivalent capacitance of the circuit?
25 \(\mu F\)
10 \(\mu F\)
15 \(\mu F\)
60 \(\mu F\)
Correct answer
25 \(\mu F\)
Which of the following is an example of a secondary battery?
Lithium-ion battery
Alkaline battery
Mercury battery
Zinc-carbon battery
Correct answer
Lithium-ion battery
A battery pack is made of three cells connected in series. Each cell has a nominal voltage of \(1.5 V\) and a capacity of \(2.5 Ah\). What is the total energy stored in the battery pack?
Correct answer
A series RL circuit is connected to an a.c. supply. If the voltage across the resistor is 30 V and the applied voltage is 50 V, what is the voltage measured across the inductor?
60 V
20 V
40 V
80 V
Correct answer
60 V
A resistor of 10 \(\Omega\) has a current of 3 A flowing through it. How much power is dissipated by the resistor?
100 W
90 W
30 W
60 W
Correct answer
100 W
What is the term for the loss that occurs due to the resistance of the transformer windings?
Eddy current loss
Friction loss
Copper loss
Hysteresis loss
Correct answer
Eddy current loss
A transformer is used to change a \(12 V\) AC supply to a \(120 V\) AC supply. What type of transformer is this?
Autotransformer
Isolation
Step-down
Step-up
Correct answer
Autotransformer
What is the purpose of laminating the core of a transformer?
To increase the magnetic flux
To reduce eddy current losses
To increase the resistance of the windings
To provide better insulation
Correct answer
To increase the magnetic flux
Which type of DC machine has its field winding connected in parallel with the armature winding?
A separately excited DC machine
A shunt DC machine
A compound DC machine
A series DC machine
Correct answer
A separately excited DC machine