Q1. | At a temperature of 7 K, lead is a superconductor. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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**Also Read Similar Questions Below :**

⇒ Consider the following program in B

2.827

28.27

282.7

2827

⇒

Match the following:

List I (Laws of Boolean) | List II (Relation algebra) | ||
---|---|---|---|

A. | Distributive law | 1. | x + x = x |

B. | DeMorgans law | 2. | x(y + z) = xy + xz |

C. | Idempotent law | 3. | (x) = x |

D. | Involution law | 4. | (x + y) = xy |

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

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

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

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

⇒ In

*CE*configuration, the output characteristics of a bipolar junction transistor is drawn between

I

_{C}and V

_{CB}

I

_{E}and V

_{CB}

I

_{C}and V

_{CE}

I

_{E}and V

_{CE}

⇒ If transmission bandwidth is doubled in FM, SNR is

doubled

raised four times

decreased four times

halved

⇒ The symbol in figure is

DIAC

P-N junction diode

Schottky diode

None of the above

⇒ If φ

_{sh}is flux of shunt magnet, φ

_{se}is flux of series magnet, i

_{sh}is eddy current due to φ

_{se}, the torque in an induction wattmeter is proportional to

φ

_{se}i

_{se}+ φ

_{sh}i

_{sh}

φ

_{sh}i

_{se}- φ

_{se}i

_{sh}

φ

_{sh}i

_{sh}- φ

_{se}i

_{se}

φ

_{sh}i

_{sh}+ φ

_{se}i

_{se}

⇒ In CE connection, the leakage current of a transistor is about

10 x 10

^{-9}A

5 x 10

^{-6}A

200 x 10

^{-6}A

5 x 10

^{-3}A

⇒ The encapsulation of transistor is necessary for

preventing radio interference

preventing photo-emission effects

avoiding loss of free electrons

mechanical ruggedness

⇒ Magnitude Plot of a Composite signal

*x*(

*t*) =

*e*

^{2jt}+

*e*

^{3jt}is

half wave rectified sinusoidal

full wave rectified sinusoidal

exponentially increasing sinusoidal

exponentially decreasing sinusoidal

⇒

**Assertion (A):** The wave shown in the given figure does not contain the dc component and even harmo

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

⇒ A voltage v = 5 + 50 sin ω*t*/ + 5 sin 5 &omega*t* is applied to a pure capacitor of capacitance 1 ωF. If *f*/= 314 rad/sec, current is

1 + 0.0157 cos 314 *t *+ 0.00785 cos 1570 *t*

0.0157 cos 314 *t* + 0.00785 cos 1570 t

0.0157 sin 314 *t* + 0.00785 sin 1570 *t *

0.0157 sin (314 *t* / + 45°) + 0.00785 sin (1570 *t* + 45°)

⇒ For signal diodes the PIV rating is usually in the range

1 V to 10V

10 V to 30V

30 V to 150V

150 V to 400V

⇒ In PCM the amplitude levels are transmitted in a 7 unit code. Sampling frequency is 10 kHz. The bandwidth should be

5 kHz

35 kHz

70 kHz

5 MHz

⇒ 39.12_{10} = __________ _{10}

10111.0001111

100011.0001111

100001.0001111

1111.0001111

⇒ The input voltage for starting oscillations in an oscillator is caused by

negative feedback

positive feedback

noise voltage in resistors

a special generator

⇒ A triangular Pulse of 10 V peak is applied to a capacitor of 0.4 F. The change of the capacitor and its wavefor

8 rectangular

8 triangular

4 triangular

4 rectangular

⇒

**Assertion (A):** XOR gate is not universal gate.

**Reason (R):** It is not possible to realize any Boolean function using XOR gates only.

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

⇒ A rectifier voltmeter using bridge rectifier and PMMC meter is calibrated to read rms value of sine wave. A triangular wave is applied to it and it reads 6.82 V. The rms value of triangular wave is

about 6.82 V

about 7.1 V

about 6.5 V

about 10 V

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Ternary | 1. | 0, 1, 3 |

B. | Quaternary | 2. | 0, 1, 2, 3, 4, 5, 6 7, 8, 9, A, B |

C. | Quinary | 3. | 0, 1, 2, 3, 4 |

D. | Duodecimal | 4. | 0, 1, 2 |

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

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

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

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

⇒ The equation ∇ . J = 0 is called

Poisson's equation

Kirchoff's node equation

Continuity equation for static currents

Continuity equation for sampling currents

⇒ In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be

out of phase by 90°

in phase

out of phase by 45°

out of phase 180°

⇒

**Assertion (A):** An RTD uses platinum coil.

**Reason (R):** Platinum is a very stable material.

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

⇒ Which one is not correct for folded dipole antenna?

High I/P impedance

Low I/P impedance

High bandwidth

Used as reactance compensation network

⇒ Which of the following statement regarding link loss for a satellite is wrong?

For fixed antenna, it is inversely proportional to

*f*

^{2}

For fixed frequency, it is inversely proportional to the product of the antenna aperture areas

For a given satellite operating at a given frequency, it is inversely proportional to

Loss in down-link is negligible as compared to that in uplink

⇒ Derivative control action is effective?

Only during steady state periods

Only during transient state periods

During both steady state and transient state periods

Either during steady state or during transient state periods

⇒ Consider the following statements relating to synchros

- Rotor of control transformer is either disc shaped or umbrella shaped
- Rotor of transmitter has low magnetic reluctance
- Transmitter and control transformer pair act as error detector

1, 2, 3

1 and 2

2 and 3

1 and 3

⇒ A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/

*f*is constant. At 50 Hz, the speed is 1440 rpm. At 25 Hz, the speed is likely to be

about 1350 rpm

about 720 rpm

about 360 rpm

either (b) or (c)

⇒ A half wave diode rectifier and full wave diode bridge rectifier both have an input frequency of 50 Hz. The frequencies of outputs respectively are

100 Hz and 50 Hz

50 Hz and 100 Hz

100 Hz each

50 Hz each

⇒ A linear time-invariant, causal continuous time system has a rational transfer function with simple poles at

*s*= - 2 and

*s*= - 4, and one simple zero at

*s*= - 1. A unit step

*u*(

*t*) is applied at the input of the system. At steady state, the output has constant value of 1. The impulse response of this system is

[exp (- 2

*t*) + exp (-4

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*) - exp (-

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*)]

*u*(

*t*)

[-0.5 exp (- 2

*t*) + 1.5 exp (-4

*t*)]

*u*(

*t*)

⇒ In sound recording the degree of pre-emphasis is about 6 dB/ octave.

TRUE

FALSE