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Q1. | Which of the following is not a data base function? |

A. | DAVERAGE [Wrong Answer] |

B. | MAX [Correct Answer] |

C. | DCOUNT [Wrong Answer] |

D. | DSTDEV [Wrong Answer] |

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

⇒ A pulse function can be represented as difference of two equal step functions.

TRUE

FALSE

⇒ Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is

average of the time constants of individual coils

sum of the time constants of the individual coils

geometric mean of the time constants of individual coils

product of the time constants of the individual coils

⇒ Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

TTL

CMOS

ECL

TTLLS

⇒ When .4546 E 5 and .5433 E 7 are to be added in normalized floating point mode

none of the numbers is changed to any other form

.4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed

.5433 E 7 is changed to 54.33 E 5 and .4546 E 5 is not changed

both the numbers are changed and their exponents are made equal to 6

⇒ In Laplace transform, multiplication by

*e*

^{-at}in time domain becomes

translation by

*a*in

*s*domain

translation by (-

*a*) in

*s*domain

multiplication by

*e*in s domain

^{-as}none of the above

⇒ In a class C power amplifier

resonant frequency of tuned circuit is equal to fundamental frequency of pulsed waveform

resonant frequency of tuned circuit is half the fundamental frequency of pulsed waveform

resonant frequency of tuned circuit has no relation to the fundamental frequency of pulsed waveform

either (b) or (c)

⇒ In figure The minimum and maximum load currents

0 and 60 mA

0 and 120 mA

10 mA and 60 mA

10 mA and 120 mA

⇒ The strength of controlled voltage source depends on

value of current elsewhere in the circuit

value of voltage elsewhere in the circuit

value of current or voltage elsewhere in the circuit

none of the above

⇒ The open loop gain of an amplifier is 200. If negative feedback with β = 0.2 is used, the closed loop gain will be

200

40.12

4.878

2.2

⇒ A chopper cannot be line commutated.

TRUE

FALSE

⇒ A sample of N-type semiconductor has electron density of 6.25 x 10

^{18}/cm

^{3}at 300k. If the intrinsic concentration of carriers in this sample is 2.5 x 10

^{13}/cm

^{3}at this temperature the hole density works out to be

10

^{6}/cm

^{3}

10

^{8}/cm

^{3}

10

^{10}/cm

^{3}

10

^{l2}/cm

^{3}

⇒ Peak to peak value of a sine wave is equal to twice the peak value

TRUE

FALSE

⇒ A variable resistance R and capacitive reactance X

_{C}are connected in series. As R is varied, the locus of Z is

a straight line parallel to Y axis in 4th quadrant

a straight line parallel to X axis in 4th quadrant

a straight line parallel to Y axis in second quadrant

a straight line parallel to Y axis in first quadrant

⇒ Consider the following statements about conditions that make a metal semiconductor contact rectifying

- N type semiconductor with work function φ
_{s}more than work function φ_{M}of metal - N type semiconductor with work function φ
_{s}less than work function φ_{M}of metal - P type semiconductor with work function φ
_{s}more than work function φ_{M}of metal - P type semiconductor with work function φ
_{s}less than work function φ_{M}of metal.

1 and 3 are correct

2 and 3 are correct

1 and 4 are correct

2 and 4 are correct

⇒ A signal is

*x*+

*f*(

*t*) where

*x*is constant and

*f*(

*t*) is a power signal with zero mean value. The power of the signal is

*x*

^{2}

*x*

^{2}+

*f*

^{2}(

*t*)

more than

*x*

^{2}+

*f*

^{2}(

*t*)

less than

*x*

^{2}+

*f*

^{2}(

*t*)

⇒ Microwave resonators are used in

microwave oscillators

microwave narrow band amplifier

microwave frequency metres

all of the above

⇒ The number of operator to accomplish basic arithmetic in Java is

4

5

6

7

⇒ A trimmer is basically a

insulator

inductor

capacitor

variable resistor

⇒ In a normally biased N-P-N transistor the main current crossing the collector junction is

a drift current

a hole current

a diffusion current

same as the base current

⇒ A reactance function

has a pole at origin

has a zero at origin

may have a pole or zero at origin

has a pole or zero at origin and a pole or zero at infinity

⇒ Identify which of the following is not a tree of the graph shown in fi

*bcgh*

*defg*

*abfg*

*aegh*

⇒ The band gap of silicon at 300K is

1.36 eV

1.10 eV

0.80 eV

0.67 eV

⇒ What is the characteristic impedance at 10 MHz?

547.7 Ω

54.7 Ω

5.47 Ω

.547 Ω

⇒ Which of the following produces upper and lower side frequencies?

Microphone

Demodulator in a superheterodyne receiver

Modulator in a. radio transmitter

Oscillator in a receiver

⇒ When a voltage is applied to a semiconductor crystal then the free electrons will flow.

towards positive terminal

towards negative terminal

either towards positive terminal or negative terminal

towards positive terminal for 1 μs and towards negative terminal for next 1 μs

⇒ A low-pass filter frequency responce H (

*j*ω) = A (ω)

*e*

^{jΦ}(ω) does not produce any phase distortion, if

A(ω) = Cω

^{2}, Φ (ω) =

*k*ω

^{3}

A(ω) = Cω

^{2}, Φ (ω) =

*k*ω

A(ω) = Cω

^{2}, Φ (ω) =

*k*ω

^{2}

A(ω) = C, Φ (ω) =

*k*ω

^{-1}

⇒ For a superconductor, the relative permeability is

zero

high

low

either low or high

⇒ In figure

*v*

_{i}= 10 mV dc maximum. The maximum possible dc output offset voltag

60 mV dc

110 mV dc

130 mV dc

150 mV dc

⇒

**Assertion (A):** Superposition theorem can be used to find the output of a full wave rectifier excited by sinusoidal signal sources of different frequencies connected in series.

**Reason (R):** Superposition theorem is valid for all linear systems.

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

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

A is true but R is false

A is false but R is true

⇒ A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be

0.9

0.8

0.75

0.6