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Q1. | In a tape recorder |

A. | the width of air gaps of record and erase heads is almost equal [Wrong Answer] |

B. | the air gap of record head is wider than the air gap of erase head [Wrong Answer] |

C. | the air gap of erase head is wider than the air gap of record head [Correct Answer] |

D. | any of the two air gaps can be wider than the other [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ For a transfer function H(

*s*) = P(

*s*)/Q(

*s*), where P(

*s*) and Q(

*s*) are polynomials in

*s*

the degrees of P(

*s*) is always greater than degree of Q(

*s*)

the degree of P(

*s*) and Q(

*s*) are equal

the degree of P(

*s*) is independent of degree of Q(

*s*)

the maximum difference in degrees of P(

*s*) and Q(

*s*) is 1

⇒ A series RL circuit is excited by a voltage

*v*(

*t*) = V

_{m }sin (ω

*t*+ Φ). The transient current will be zero if

Φ = 0

ω = 0

Φ = tan

^{-1}(ωL/R)

ω - tan

^{-1}(ωL/R) = p/2

⇒ Which of the following parameters is negligible in transmission lines?

R

L

C

G

⇒ The unit for mmf is

A

Wb

T

V

⇒ For the circuit shown in the figure, the current

indeterminate due to indeterminate data

zero

4 Amp

8 Amp

⇒ A decade counter skips

binary states 1000 to 1111

binary states 0000 to 0011

binary states 1010 to 1111

binary states 1111 to higher

⇒ In figure the phase

will be 90° at ω = 0 and 0° at ω = ∞

will be 0° at ω = 0 and 90° at ω = ∞

will be 45° at ω = 0 and 0° at ω = ∞

will be 45° at ω = 0 and 90° at ω = ∞

⇒ Each of the following statements regarding frequency modulation is true except

amplitude of the modulated wave remains the same as that of carrier wave

the amount of variation of deviation from the original carrier frequency is determined by the frequency of the modulating signal

the rate at which the frequency of modulated wave varies is determined by the frequency of the modulating signal

frequency of modulated wave increases as the signal voltage increases and vice-versa

⇒ What binary number does second row represent?

1111001

1010101

10101010

11101010

⇒ A 3 bit synchronous counter uses FF with propagation delay time of 20 ns each. The maximum possible time required for change of state will be.

60 ns

40 ns

20 ns

None

⇒ Calculate the conductivity of pure silicon at room temperature when the concentration of carriers is 1.6 x 10

^{10}per cm

^{3}. Take μ

_{e}= 1500 cm

^{2}/V-sec, μ

_{h}= 500 cm

^{2}/V-sec at room temperature,

5.12 x 10

^{-16}

5 x 10

^{+16}

10

^{16}

5 x 10

^{20}

⇒ A line has Z

_{0}= 300 ∠ 0° Ω. If

*Z*

_{L}= 150 ∠ 0° Ω, reflection coefficient is

0.5

0.3333

-0.3333

-0.5

⇒ A pure tone at 1000 Hz has a dB level of 50 dB. If two such tones exist simultaneously the dB level is about

50 dB

53 dB

100 dB

200 dB

⇒ One of the major applications of JFET is in

switching

constant current-source

constant voltage-source

electron flow regulation

⇒ A minimum function has

poles and zeros on imaginary axis of

*s*plane

no poles or zeros on imaginary axis of

*s*plane

only poles but no zeros on imaginary axis of

*s*plane

only zeros but no poles on imaginary axis of

*s*plane

⇒

**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

⇒ Volume control found on the front panel of television receivers

a ganged resistor

a variable resistor of logarithmic type

a variable resistor of linear type

a trimmer potentiometer

⇒ The dual of A + [B + (AC)] + D is

A + [(B (A + C))] + D

A [B + AC] D

A + [B (A + C)] D

A [B (A + C)] D

⇒ Characteristic wave impedance is

ε/μ

(ε/μ)

^{1/2}

E

_{x}/H

_{y}

H

_{y}/E

_{x}

⇒ Class A and Class B power amplifiers predominate at

audio frequencies

radio frequencies

all frequencies

audio and radio frequency

⇒ The total number of leads in reverse conducting thyristor is

2

3

1

4

⇒

**Assertion (A):** The line integral of B about a closed contour, in a region containing steady current, is μ_{0} times the total net current, following through the contour of integration.

**Reason (R):** The curl of B is equal to μ_{0} times the current density vector J

Both (A) and (R) are true and (R) is the correct explanation of (A)

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

(A) is true but (R) is false

(A) is false but (R) is true

⇒

**Assertion (A):** In a differential amplifier the current through common emitter resistor is called tail current

**Reason (R):** CMRR of an op-amp indicates how a differential signal amplified

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

⇒ An ammeter is

secondary instrument

absolute instrument

recording instrument

integrating instrument

⇒ In CE amplifier the base current is very high.

TRUE

FALSE

⇒ The hexadecimal number given below represent decimal numbers which are multiples of DC, C8, BE, 46, IE

2

6

7

10

⇒ Typical value of power consumption of TV transmitter is

0.5 kVA

2 kVA

50 kVA

1000 kVA

⇒ If

*f*be the signal frequency and

_{s}*f*be the intermediate frequency then image frequency is given by

_{i}*f*+

_{s}*f*

_{i}*f*±

_{s}*f*

_{i}*f*± 2

_{s}*f*

_{i}*f*+ 2

_{s}*f*

_{i}⇒ The 2's complement representation of the decimal number -4 is

100

1100

1011

1010

⇒ In 8085, out of interrupts given below, one particular interrupts is quite different from others, This interrupt is

RST 5.5

RST 6.5

RST 7.5

none of these