# Trishna - The Technical Quiz

20 Questions  Settings  Related Topics
• 1.
Which mode of operation is preferred to work BJT as an attenuator ?
• A.

Saturation

• B.

Reverse active

• C.

Cut off

• D.

Active

• 2.
What is the r.m.s. value of output voltage for an half wave rectifier ,if input V(max)=2 volts ?
• A.

1.414

• B.

1

• C.

2

• D.

2.828

• 3.
What is the effect of negative feedback  ?
• A.

Increase in noice

• B.

Decrease in bandwidth

• C.

Decrease in gain

• D.

Both b & c

• 4.
Bandwidth of DSB-SC signal if maximum frequency component of input message signal 4KHz?
• A.

4KHz

• B.

8KHz

• C.

6KHz

• D.

2KHz

• 5.
𝛿(-2t)=
• A.

-𝛿(t)/2

• B.

-2𝛿(t)

• C.

𝛿(t)/2

• D.

2𝛿(t)

• 6.
What is the value of Rfor which maximum power is transferred to RL?
• A.

5 Ω

• B.

10 Ω

• C.

0 Ω

• D.

∞ Ω

• 7.
Condition for symmetic network ?
• A.

Y12 = - Y21

• B.

• C.

Z11 = Z22

• D.

H12 = - h21

• 8.
Any series RLC network represents__________?
• A.

High pass filter

• B.

Low pass filter

• C.

Band pass filter

• D.

Band reject filter

• 9.
The value of frequency at which maximum current flows in the circuit is______
• A.

1

• B.

1/2

• C.

1/4π

• D.

1/2π

• 10.
Transfer function of a system is
• A.

L.T of impulse response

• B.

L.T of unit step response

• C.

Ratio of L.T of output and L.T of input

• D.

Both '1' and '3'

• 11.
Curl of vector is always
• A.

Irrotational

• B.

Solenoidal

• C.

Both

• D.

None

• 12.
Convert Binary code (1011)2 to Grey code ?
• A.

1111

• B.

0101

• C.

1110

• D.

1101

• 13.
Bandwidth of a given circuit is
• A.

4 Hz

• B.

2 Hz

• C.

6 Hz

• D.

8 Hz

• 14.
Given figure  is equivalent to ?
• A.

NAND

• B.

OR

• C.

NOR

• D.

AND

• 15.
The output expression 'f' is
• A.

AB

• B.

A'+B

• C.

A+B

• D.

A+B'

• 16.
Number of NAND gates required  for expression  A'B+AB' ?
• A.

5

• B.

3

• C.

4

• D.

6

• 17.
The frequency of output waveform if propagation delay of each gate is 1/6 ns
• A.

1MHz

• B.

10GHz

• C.

1GHz

• D.

100MHz

• 18.
RMS value of  ( 5 + 2cos2t + 3sin2t )  =
• 19.
Internal resistance of Ideal voltage source is
• 20.
Conductivity of pure seiconductor at '0'K is