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Q1. | The factor n in the equation for calculating current for a silicon diode is |

A. | 1 [Wrong Answer] |

B. | 2 [Wrong Answer] |

C. | 2.5 [Wrong Answer] |

D. | 2 for low levels of current and 1 for high levels of current [Correct Answer] |

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

⇒ A parallel plate capacitor with air as dielectric has a capacitance C. If the dielectric has a dielectric constant ∈

_{r}and the remaining dimensions are the same, the capacitance will be

C/∈

_{r}

∈

_{r}C

∈

^{2}

_{r}C

∈

^{3}

_{r}C

⇒ A circuit which cannot demodulate SSB is

balanced modulator

product detector

BFO

phase discriminator

⇒ Fields are said to be circularly polarised if their magnitudes are

equal and they are in phase

equal but they differ in phase by ± 90°

unequal and differ in phase by ± 90°

unequal but are in phase

⇒

**Assertion (A):** The resolution of a DAC depends on the number of bits

**Reason (R):** Low resolution leads to fine control.

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 true, R is false

A is false, R is true

⇒

Match the following:

List I (Binary) | List II (Hexadecimal) | ||
---|---|---|---|

A. | 10101010 | 1. | FF |

B. | 11111111 | 2. | 88 |

C. | 10001000 | 3. | 92 |

D. | 10010010 | 4. | AA |

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

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

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

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

⇒ The input resistance R, of an ideal voltage amplifier is __________ and that of a current amplifier is __________ .

zero, zero

infinite, infinite

zero, infinite

infinite, zero

⇒ The Boolean function A + BC is a reduced form of

AB + BC

(A + B) . (A + C)

AB + ABC

(A + C) . B

⇒ A material for permanent magnet should have

High retentivity

High permeability

Low hysteresis loss

High hysteresis loss

⇒ Zero bias works only with

D MOSFETs

E MOSFETs

both D and E MOSFETs

neither D nor E MOSFETs

⇒ The approximate value of input impedance of a common emitter amplifier with emitter resistance R

_{e}is given by

*h*

_{ie}+ A

_{I}R

_{e}

*h*

_{ie}+ (

*i*+

*h*

_{fe}) R

_{e}

*h*

_{ie}

(1 +

*h*

_{fe}) R

_{e}

⇒ Baudot code is a six bit code.

TRUE

FALSE

⇒ What is the direction of control

Unidirectional into μ

*p*

Unidirection out of μ

*p*

Bidirectional

Mixed direction, i.e., some lines into μ

*p*an some others out of μ

*p*

⇒ Consider the voltage transfer characteristic of a standard CMOS inve

NMOS and PMOS triode

Both are saturation

NMOS saturated PMOS linear

None of these

⇒ In VCR the luminance signal is recorded by

frequency modulation

phase modulation

amplitude modulation

direct recording

⇒ The feedback resistance r

_{d}in small signal model of MOSFET is of the order of

1000 MΩ

1 MΩ

1 KΩ

100 Ω

⇒ In microprocessor 8088

8 data bits are multiplexed with 8 least significant bits of address bus

8 data bits are multiplexed with 8 most significant bits of address bus

16 data bits are multiplexed with 16 bits of address bus

none of the above

⇒ Which of the following is equivalent to

*x*?

x EX-OR 0

x EX-NOR 0

1 NOR x

x AND x

⇒ A series RC circuit has R = 5 Ω and C = 10 μF. The current in the circuit is 5 sin 20000

*t*. The applied voltage is

252 sin (20000

*t*+ 45°)

252 sin (20000

*t*- 45°)

252 sin 20000

*t*

252 sin (20000

*t*- 90°)

⇒ Television transmission is by

ground waves

sky waves

space waves

all of the above

⇒ In which frequency range is the noise figure in a transistor independent of frequency

intermediate frequencies

high frequency

low frequencies

both low and high frequencies

⇒ The V-

*i*relation for a varistor is

*i*=

*kv*

^{n}

*v*=

*ki*

^{n}

*i*=

*kv*

^{3}

*v*=

*ki*

^{3}

⇒ In an inverting amplifier using op-amp the current input to the inverting terminal

is equal to the current through feedback resistance

is less than the current through feedback resistance

is more than the current through feedback resistance

may be equal to, less or more than current through feedback resistance

⇒ In a three cavity klystron amplifier, the oscillations are excited in

input cavity

output cavity

intermediate cavity

both (a) and (b)

⇒ A circular waveguide has an infinite set of TE and TM modes.

TRUE

FALSE

⇒

**Assertion (A):** In two wattmeter method of 3 phase power measurement, one of the wattmeters would read negative if power factor of load is less than 0.5.

**Reason (R):** In two wattmeter method of 3 phase power measurement, both the wattmeters would show equal readings if power factor of load is unity.

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

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

A is true R is false

A is false R is true

⇒ A bridge rectifier circuit has a dc load current of 10 mA and a filter capacitance of 1000 μF. The peak to peak ripple voltage is

0.01 V

0.05 V

0.1 V

0.5 V

⇒ A coil resonates at 1 MHz with a resonating capacitance of 72 pF. At 500 pF, resonance is obtained with a resonating capacitor of 360 pF. The self capacitance of coil is

12 pF

24 pF

30 pF

72 pF

⇒ The circuit whose properties are same in either direction is known as

unilateral circuit

bilateral circuit

irreversible circuit

reversible circuit

⇒ In a thermocouple two metal junctions between metals

*M*

_{1}and

*M*

_{2}are kept at temperature

*T*

_{1}and

*T*

_{2}. The thermocouple emf is produced because

M

_{1}, M

_{2}are similar and T

_{1}, T

_{2}are equal

M

_{1}, M

_{2}are similar but T

_{1}, T

_{2}are unequal

M

_{1}, M

_{2}are dissimilar but T

_{1}, T

_{2}are equal

M

_{1}, M

_{2}are dissimilar but T

_{1}, T

_{2}are unequal

⇒ In the following non planar graph number of independent loop equations

8

12

7

5