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Q1. | The number of switching functions of 3 variables are |

A. | 3 [Wrong Answer] |

B. | 8 [Correct Answer] |

C. | 16 [Wrong Answer] |

D. | 32 [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ A system is said to be marginal stable if

poles lies on Real axis

zero lies on Real axis

poles lies on Imaginary axis

zeros lies on origin

⇒ A series RLC circuit is supplied from a variable frequency source. The resonant frequency is ω

_{0}. The voltage across L is maximum at a frequency

equal to ω

_{0}

slightly less than ω

_{0}

slightly more than ω

_{0}

none of the above

⇒

Match the following:

Microwave Measuring Instruments | Measurements Effected | ||
---|---|---|---|

A. | Bolometer | 1. | Reflection coefficients |

B. | VSWR meter | 2. | Half power beam widths |

C. | Cavity wave meter | 3. | Microwave power |

D. | Pattern recorder | 4. | Microwave frequency |

A-2, B-1, C-4, D-3

A-3, B-1, C-4, D-2

A-2, B-4, C-1, D-3

A-3, B-4, C-1, D-2

⇒ Which of the following statement is false?

Television signals are propagated as ground waves

Surface waves can propagate on piezoelectric substrates

The skip distance is the maximum distance upto which ionospheric reflection is possible

Tropospheric scatter propagation is always subjects to fading

⇒

**Assertion (A):** A small section of high impedance line is equivalent to a series inductance.

**Reason (R):** A small section of a low impedance line is equivalent to a series resistance.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ An infinite ladder is constructed with 1 Ω and 2 Ω resistors as shown below. Find

*i*

8.1818 A

0

0.375

cannot be determined

8.1818 A

0

0.375

cannot be determined

⇒ A microwave connector should have high SWR.

TRUE

FALSE

⇒ A flip flop is a

combinational circuit

memory element

arithmetic element

memory or arithmetic element

⇒ Electric breakdown strength of a material depends on its

composition

moisture content

thickness

all of the above

⇒ In figure the voltage drop across diode is 0.7 V. Then the voltage across diode during negative half cycl

10 V

9.3 V

zero

10.7 V

⇒ Which of the following modulation is analog in nature?

PCM

DPCM

DM

PDM

⇒ Which one of the following is the correct sequence of the numbers represented in the series given below?

2, 3, 4, 5, 6......

2, 4, 6, 8, 10 .....

2, 4, 6, 10, 12......

2, 4, 6, 10, 16 .....

⇒ In a current transformers

the number of turns in primary and secondary windings are nearly equal

the number of primary turns is very small as compared to number of secondary turns.

the number of secondary turns is very small as compared to the number of primary turns

either (a) or (c).

⇒ Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is

zero

90°

either zero or 180°

either 90° or 270°

⇒ Start and stop bit do not contain any information but are used in serial communication for

error correction

error detection

synchronization

slowing down the communication

⇒ Which inductor is used at high frequencies?

Cast iron cored

Sheet steel cored

Iron alloy cored

Ceramic cored

⇒ All magnetic materials exhibit the phenomenon of saturation.

TRUE

FALSE

⇒ If the carrier modulated by a digital bit stream has one of the possible phases of 0°, 90°, 180° and 270°. Then the modulation is called

BPSK

QPSK

QAM

MSK

⇒ In a Hurwitz polynomial

all coefficients are non-negative

both the odd and even parts have roots on

the continued fraction expansion is the ratio of odd to even parts of a Hurwitz polynomial yields all positive quotient terms

all of the above

⇒ In the given figure the E and H lines in a coaxial c

The radial lines are E lines and circular lines are H lines

Radial lines are H lines and circular lines are E lines

The directions of E and H lines are wrong

Radial lines may be E and H lines depending an direction of current

⇒ The relation between bandwidth B, modulating frequency

B = Δ

B = 2(Δ

B =

B = 2(

⇒ In gases the flow of current is due to

positive ions only

electrons only

electrons, positive ions and negative ions

electrons and positive ions

⇒ The two numbers represent in signed 2's complement form are P = 11101101 and Q = 111001110. If Q subtracted from P, the value obtained in signed 2's complement form is

100000111

111

11111001

111111001

⇒ Which one of the following is not a useful quantity for comparing the noise performance of receivers?

Noise figure

Noise temperature

Input noise voltage

Equivalent noise resistance

⇒ It is found that in a telephone system 60 subscribers initiate calls during a 30 minute interval and the total duration of all the calls is 100 minutes. The load is

2

3 erlang

3.333 erlang

0.333 erlang

⇒ If any term in the first column of a Routh array becomes zero, then

Routh criterion cannot be used to determine stability

Routh criterion can be used by substituting a small positive number for zero and completing the array

Routh criterion can be used by substituting a big positive number for zero and completing the array

Routh criterion can be used by substituting a small negative number for zero and completing the array

⇒ A 3 bit up-down counter can count from

000 to 111

111 to 000

000 to 111 and also from 111 to 000

none of the above

⇒

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ Registers and counters are similar in the sense that they both

count pulses

store binary information

are made from an array of flip-flops and gates integrated on a single chip

are shift registers

⇒ Nyquist stability criterion is based on a theorem from the theory of complex variables.

TRUE

FALSE

⇒ A microwave connector should have high SWR.

TRUE

FALSE

⇒ A flip flop is a

combinational circuit

memory element

arithmetic element

memory or arithmetic element

⇒ Electric breakdown strength of a material depends on its

composition

moisture content

thickness

all of the above

⇒ In figure the voltage drop across diode is 0.7 V. Then the voltage across diode during negative half cycl

10 V

9.3 V

zero

10.7 V

⇒ Which of the following modulation is analog in nature?

PCM

DPCM

DM

PDM

⇒ Which one of the following is the correct sequence of the numbers represented in the series given below?

2, 3, 4, 5, 6......

2, 4, 6, 8, 10 .....

2, 4, 6, 10, 12......

2, 4, 6, 10, 16 .....

⇒ In a current transformers

the number of turns in primary and secondary windings are nearly equal

the number of primary turns is very small as compared to number of secondary turns.

the number of secondary turns is very small as compared to the number of primary turns

either (a) or (c).

⇒ Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is

zero

90°

either zero or 180°

either 90° or 270°

⇒ Start and stop bit do not contain any information but are used in serial communication for

error correction

error detection

synchronization

slowing down the communication

⇒ Which inductor is used at high frequencies?

Cast iron cored

Sheet steel cored

Iron alloy cored

Ceramic cored

⇒ All magnetic materials exhibit the phenomenon of saturation.

TRUE

FALSE

⇒ If the carrier modulated by a digital bit stream has one of the possible phases of 0°, 90°, 180° and 270°. Then the modulation is called

BPSK

QPSK

QAM

MSK

⇒ In a Hurwitz polynomial

all coefficients are non-negative

both the odd and even parts have roots on

*j*ω axisthe continued fraction expansion is the ratio of odd to even parts of a Hurwitz polynomial yields all positive quotient terms

all of the above

⇒ In the given figure the E and H lines in a coaxial c

The radial lines are E lines and circular lines are H lines

Radial lines are H lines and circular lines are E lines

The directions of E and H lines are wrong

Radial lines may be E and H lines depending an direction of current

⇒ The relation between bandwidth B, modulating frequency

*f*and frequency deviation Δ_{m}*f*for a sinusoidally modulated FM signal isB = Δ

*f*+*f*_{m}B = 2(Δ

*f*+*f*)_{m}B =

*f*- Δ_{m}*f*/B = 2(

*f*- Δ_{m}*f*)⇒ In gases the flow of current is due to

positive ions only

electrons only

electrons, positive ions and negative ions

electrons and positive ions

⇒ The two numbers represent in signed 2's complement form are P = 11101101 and Q = 111001110. If Q subtracted from P, the value obtained in signed 2's complement form is

100000111

111

11111001

111111001

⇒ Which one of the following is not a useful quantity for comparing the noise performance of receivers?

Noise figure

Noise temperature

Input noise voltage

Equivalent noise resistance

⇒ It is found that in a telephone system 60 subscribers initiate calls during a 30 minute interval and the total duration of all the calls is 100 minutes. The load is

2

3 erlang

3.333 erlang

0.333 erlang

⇒ If any term in the first column of a Routh array becomes zero, then

Routh criterion cannot be used to determine stability

Routh criterion can be used by substituting a small positive number for zero and completing the array

Routh criterion can be used by substituting a big positive number for zero and completing the array

Routh criterion can be used by substituting a small negative number for zero and completing the array

⇒ A 3 bit up-down counter can count from

000 to 111

111 to 000

000 to 111 and also from 111 to 000

none of the above

⇒

**Assertion (A):** A common collector amplifier is used for matching a high impedance source to a low impedance load

**Reason (R):** A common collector amplifier has a near unity voltage gain

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ Registers and counters are similar in the sense that they both

count pulses

store binary information

are made from an array of flip-flops and gates integrated on a single chip

are shift registers

⇒ Nyquist stability criterion is based on a theorem from the theory of complex variables.

TRUE

FALSE