# A circular loop has its radius increasing at a rate of 2 m/s. The loop is placed perpendicular to a constant magnetic field at 0.1 wb/m2. When the radius of the loop is m, the emf induced in the loop will be

1.  0.8 π V

2.  0.9 π V

3.  0.2 π V

4.  zero

4

0.8 π V

Explanation :
No Explanation available for this question

# Which of the following system is unstable

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# A two-stage amplifier is required to have an upper cut off frequency of 2 MHz and a lower cut off frequency of 30 Hz. The upper and lower cut off frequencies of individual stage are respectively

1.  4 MHz, 60 Hz

2.  3 MHz, 20 Hz

3.  3 MHz, 60 Hz

4.  4 MHz, 20 Hz

4

3 MHz, 20 Hz

Explanation :
No Explanation available for this question

# A series RLC circuit consisting of R = 10 ohms, XL = 20 ohms and XC = ohms is connected across an ac supply of 100 v (rms). The magnitude and phase angle (with reference to supply voltage) of the voltage across the inductive coil are respectively,

1.  100 V, 900

2.  100 V, -900

3.  200 V, -900

4.  200 V, 900

4

200 V, 900

Explanation :
No Explanation available for this question

# After closing the switch ‘S’ at t= 0, the current i(t) at any instant ‘t’ in the network shown in the given figure will be

1.  10 + 10e100t

2.  10 – 10e100t

3.  10 + 10e-100t

4.  10 – 10e-100t

4

10 – 10e-100t

Explanation :
No Explanation available for this question

# A system is presented by dy/dt + 2y = 4 t u(t).The ramp constant in the forced response will be

1.  t. u(t)

2.  2t u(t)

3.  3t u(t)

4.  4t u(t)

4

2t u(t)

Explanation :
No Explanation available for this question

# The approximate input impedance of the OPAMP circuit shown below is

1.  ∞

2.  120 K

3.  110 K

4.  10 K

4

10 K

Explanation :
No Explanation available for this question

# The root-locus of a unity feedback system is shown in the figure. The open loop transient function is given by

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# Laplace transform of the function i(t) is I(s) = 10s+4/s(s+1) (s2+4s+5). Its final value will be

1.  4/5

2.  5/4

3.  4

4.  5

4

4/5

Explanation :
No Explanation available for this question

1.  αe-αt

2.  1/α e-t/α

3.  1/ αe-αt

4.  (1-α)e-αt

4