Basic Electrical Engineering (3110005) MCQs

MCQs of DC Circuits

Showing 121 to 130 out of 137 Questions
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121.
If the Voltage increases, what happens to dielectric strength?
(a) Increases
(b) Decreases
(c) Remains the same
(d) Becomes zero
Answer:

Option (a)

122.
Which medium has the highest dielectric strength?
(a) Water
(b) Mica
(c) Air
(d) Glass
Answer:

Option (c)

123.
A voltage source connected in series with a resistor can be converted to a?
(a) Current source in series with a resistor
(b) Current source in parallel with a resistor
(c) Voltage source in parallel with a resistor
(d) Cannot be modified
Answer:

Option (b)

124.
A current source connected in parallel with a resistor can be converted to a?
(a) Current source in series with a resistor
(b) Voltage source in series with a resistor
(c) Voltage source in parallel with a resistor
(d) Cannot be modified
Answer:

Option (b)

125.
A source transformation is_________
(a) Unilateral
(b) Bilateral
(c) Unique
(d) Cannot be determined
Answer:

Option (b)

126.
In source transformation________
(a) Voltage source remains the same
(b) Current sources remain the same
(c) Both voltage and current source remain the same
(d) Resistances remain the same
Answer:

Option (d)

127.
Which, among the following is the right expression for converting from delta to star?
(a) R1=Ra*Rb/(Ra+Rb+Rc), R2=Rb*Rc/(Ra+Rb+Rc), R3=Rc*Ra/(Ra+Rb+Rc)
(b) R1=Ra/(Ra+Rb+Rc), R2=Rb/(Ra+Rb+Rc), Rc=/(Ra+Rb+Rc)
(c) R1=Ra*Rb*Rc/(Ra+Rb+Rc), R2=Ra*Rb/(Ra+Rb+Rc), R3=Ra/(Ra+Rb+Rc)
(d) R1=Ra*Rb*Rc/(Ra+Rb+Rc), R2=Ra*Rb*Rc/(Ra+Rb+Rc), R3=Ra*Rb*Rc/(Ra+Rb+Rc)
Answer:

Option (a)

128.
Which, among the following is the correct expression for star-delta conversion?R1=Ra*Rb/(Ra+Rb+Rc), R2=Rb*Rc/(Ra+Rb+Rc), R3=Rc*Ra/(Ra+Rb+Rc)b)
(a) R1=Ra*Rb/(Ra+Rb+Rc), R2=Rb*Rc/(Ra+Rb+Rc), R3=Rc*Ra/(Ra+Rb+Rc)b)
(b) R1=Ra/(Ra+Rb+Rc), R2=Rb/(Ra+Rb+Rc), Rc=/(Ra+Rb+Rc)
(c) R1=Ra+Rb+Ra*Rb/Rc, R2=Rc+Rb+Rc*Rb/Ra, R3=Ra+Rc+Ra*Rc/Rb
(d) R1=Ra*Rb/Rc, R2=Rc*Rb/Ra, R3=Ra*Rc/Rb
Answer:

Option (c)

129.
Superposition theorem is valid for _________
(a) Linear systems
(b) Non-linear systems
(c) Both linear and non-linear systems
(d) Neither linear nor non-linear systems
Answer:

Option (a)

130.
In superposition theorem, when we consider the effect of one voltage source, all the other voltage sources are ____________
(a) Shorted
(b) Opened
(c) Removed
(d) Undisturbed
Answer:

Option (a)

Showing 121 to 130 out of 137 Questions
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