Alternating Current Test

Result

Alternating Current Test - 8

Score
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Weekly Quiz Competition

Question 1
4 / -1

Average power in the L–C–R circuit depends upon the

A
current

B
phase difference only

C
emf

D
current, emf and phase difference

Solution
Question 2
4 / -1

In Colpitt oscillator the feedback network consists of

A
two inductors and a capacitor

B
two capacitors and an inductor

C
three pairs of R-C circuit

D
three pairs of R-L circuit
Question 3
4 / -1

In a circuit, the current lags behind the voltage by a phase difference of π/ 2, the circuit will contains which of the following ?

A
Only R

B
Only C

C
R and C

D
Only L
Question 4
4 / -1

A choke is preferred to a resistance for limiting current in AC circuit, because

A
choke is cheap

B
there is no wastage of power

C
choke is compact in size

D
choke is a good absorber of heat

Solution
Question 5
4 / -1

In L-C-R circuit if resistance increases, quality factor

A
increases finitely

B
decreases finitely

C
remains constant

D
None of these

Solution
Question 6
4 / -1

In an L-C-R series AC circuit, the voltage across each of the components L, C and R is 50 V. The voltage across the L-C combination will be

A
50 V

B
50√2 V

C
100 V

D
zero
Question 7
4 / -1

In an L-C-R circuit, capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance should be changed from L to

A
4L

B
2L

C
L/2

D
L/4

Solution
Question 8
4 / -1

In an AC circuit, the current lags behind the voltage by π/3. The components of the circuit are

A
R and L

B
L and C

C
R and C

D
Only R

Solution
Question 9
4 / -1

An inductance 1 H is connected in series with an AC source of 220 V and 50 Hz. The inductive reactance (in ohm) is

A
2 π

B
50 π

C
100 π

D
1000 π

Solution
Question 10
4 / -1

The current voltage relation of diode is given by I = (e^l000V/T – 1) mA, where the applied voltage V is in volt and the temperature T is in kelvin. If a student makes an error measuring ± 0.01 V while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA?

A
0.2 mA

B
0.02 mA

C
0.5 mA

D
0.05 mA

Solution