ExamGOAL
Books
PreviousNext
2
MCQ (Single Correct Answer)

An alternating current generator has an internal resistance $R_g$ and an internal reactance $X_g$. It is used to supply power to a passive load consisting of a resistance $R_g$ and a reactance $X_L$. For maximum power to be delivered from the generator to the load, the value of $X_L$ is equal to

A
zero
B
$X_g$
C
$-X_g$
D
$R_g$
3
MCQ (Single Correct Answer)

When a voltage measuring device is connected to $A C$ mains, the meter shows the steady input voltage of 220 V . This means

A
input voltage cannot be $A C$ voltage, but a DC voltage
B
maximum input voltage is 220 V
C
the meter reads not $v$ but $< v^2>$ and is calibrated to read $\sqrt{< v^2>}$
D
the pointer of the meter is stuck by some mechanical defect
4
MCQ (Single Correct Answer)

To reduce the resonant frequency in an $L-C-R$ series circuit with a generator

A
the generator frequency should be reduced
B
another capacitor should be added in parallel to the first
C
the iron core of the inductor should be removed
D
dielectric in the capacitor should be removed
5
MCQ (Single Correct Answer)

Which of the following combinations should be selected for better tuning of an $L-C-R$ circuit used for communication?

A
$R=20 \Omega, L=1.5 \mathrm{H}, C=35 \propto \mathrm{~F}$
B
$R=25 \Omega, L=2.5 \mathrm{H}, C=45 \alpha \mathrm{~F}$
C
$R=15 \Omega, L=3.5 \mathrm{H}, C=30 \alpha \mathrm{~F}$
D
$R=25 \Omega, L=1.5 \mathrm{H}, C=45 \propto \mathrm{~F}$
6
MCQ (Single Correct Answer)

An inductor of reactance $1 \Omega$ and a resistor of $2 \Omega$ are connected in series to the terminals of a 6 V (rms) AC source. The power dissipated in the circuit is

A
8 W
B
12 W
C
14.4 W
D
18 W
PreviousNext