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Q1. | In metals, the flow of current is due to |

A. | electrons [Correct Answer] |

B. | ions [Wrong Answer] |

C. | holes [Wrong Answer] |

D. | electrons and ions [Wrong Answer] |

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

⇒ In figure, the switch is closed at

*t*= 0. After some time

*i*= 6A and rate of change of current was 4A/s. The value of inducto

1 H

1.5 H

indeterminate

0.5 H

⇒ In a two phasor servomotor, the direction of rotation of the rotating field depends on

magnitudes of voltages applied to the two stator windings

phase relation of voltages applied to the two stator windings

both magnitude and phase relationship of voltages applied to the two stator windings

none of the above

⇒ A load Z

_{L}= R

_{L}+

*j*X

_{L}is to be matched using an ideal transformer to generator of internal impedance Z

_{S}= R

_{S}+

*j*X

_{S}. The ratio of transformer required is __________ .

|Z

_{S}|/|Z

_{L}|

R

_{L}/R

_{S}

R

_{L}/Z

_{S}

|Z

_{L}|/R

_{S}

⇒ Two ammeters having resistances of 0.5 Ω and 0.25 Ω and having full scale reading of 25 A each are connected in parallel. To ensure that neither of them goes beyond scale, the total current should not be more than

50 A

37.5 A

25 A

40 A

⇒ 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

⇒ Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?

Dust particles may not accumulate

Charge per unit area becomes very high for lightening to discharge

Rain drops may not collect

None of the above

⇒ A single phase half wave rectifier is feeding a resistive load. When a = 0, dc output voltage is 127 V. When a = 30°, the dc output voltage will be about

127 V

120 V

110 V

100 V

⇒ Which of the following cannot be the Fourier series expansion of a periodic signal?

*x*(

*t*) = 2 cos

*t*+ 3 cos 3

*t*

*x*(

*t*) = 2 cos pt + 7 cos

*t*

*x*(

*t*) = cos

*t*+ 0.5

*x*(

*t*) = 2 cos 1.5p

*t*+ sin 3.5 p

*t*

⇒

**Assertion (A):** Operator has a value 1 ∠ - 90° or 1 ∠ 90°.

**Reason (R):** Operator '*a*' has a value 1 ∠ 120°.

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

⇒ State space analysis is applicable to

time invariant systems

time varying systems

both time invariant and time varying systems

none of the above

⇒ A coil has a designed for high Q performance at a rated voltage and a specified frequency. If the frequency of operation is doubled, and the coil is operated at the same rated voltage, then the Q factor and the active power P consumed by the coil will be affected as follows.

P is doubled, Q is halved

P is halved, Q is doubled

P remains constant, Q is doubled

P decreases 4 times, Q is doubled

⇒ During transmission over a communication channel, bit errors occur independently with probability P. If a block of

*n*bits is transmitted, the probability of at most one bit error is equal to

1 - (1 - P)

^{n}

P + (

*n*- 1) (1 - P)

*n*P (1 - P)

^{n - 1}

(1 - P)

^{n}+

*n*P (1 - P)

^{n - 1}

⇒ The sensitivity of a potentiometer can be increased by

increasing the length of wire

decreasing the length of wire

increasing the current in the wire

decreasing the current in the wire

⇒ In a waveguide the dielectric region is generally

air

magnetic material

brass

mica

⇒ ISDN stands for

Integrated Services Digital Network

Inter Services Digital Network

Inter Subscriber Digital Network

integrated Subscriber Digital Network

⇒ The number of inputs and outputs in a full adder are

2 and 1

2 and 2

3 and 3

3 and 2

⇒ Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resulting electric field inside the speciment will be in

direction normal to both current and magnetic field

the direction of current

direction antiparallel to magnetic field

an arbitrary direction depend upon conductivity

⇒ In dielectric heating, the thyristor circuits consist of

rectifier-chopper combination

controlled rectifier

ac regulator

rectifier-inverter combination

⇒ Which of the following real variable names is not valid in Fortran?

BETA

ALPHA

A

AB * 2

⇒ The bandwidth required for amplitude modulation is

half the frequency of modulating signal

equal to the frequency of modulating signal

twice the frequency of modulating signal

four times the frequency of modulating signal

⇒ A parity detector can detect

single error only

single error or odd number of errors

two errors

single or two errors

⇒ If

*p*is the probability of success and

*q*is the probability of failure, then the probability that there are

*r*successes in

*n*trails is

^{n}

*c*

_{r}

*p*

^{r}*q*

^{n}

^{-}

^{r}

^{n}*c*

_{r}

*p*

^{n -}

^{r}*q*

^{r}^{n}

*c*

_{r}

*p*

^{r}*q*

^{n}

^{+}

^{r}

^{n}*c*

_{r}*p*

^{n}*q*

^{n}^{- r}

⇒

Match the following:

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

A. | 45 | 1. | 10110100 |

B. | 90 | 2. | 11010010 |

C. | 180 | 3. | 01011010 |

D. | 210 | 4. | 00101101 |

5. | 10101000 |

A-3, B-4, C-5, D-2

A-4, B-3, C-5, D-2

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

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

⇒ In figure, Z

_{a}= 100∠50°, Z

_{b}= 300∠-90° and Z

_{c}= 200∠0°. For balanced condition, Z

_{d}will

600∠ - 40°

600∠140°

600∠ - 140°

150∠140°

⇒ Which one is true for writing array variable in Pascal?

The general form of an array variable is an integer or a real variable name followed by subscripts enclosed within square brackets. The subscripts are separated by commas

The general form of an array variable must be an integer name followed by subscripts enclosed within square brackets. The subscripts are separated by commas

The subscripts in array variable must be separated by dots

The subscripts must be enclosed within parenthesis

⇒ Instruction cycle is the time required to complete the execution of an instruction.

TRUE

FALSE

⇒ Two identical FETs each having parameters

*g*

_{m}and

*r*

_{d}are connected is parallel. The composite FET has parameters

0.5

*g*

_{m}and 2

*r*

_{d}

0.5

*g*

_{m}and 0.5

*r*

_{d}

2

*g*

_{m}and 2

*r*

_{d}

2

*g*

_{m}and 0.5

*r*

_{d}

⇒

Match the following:

List I (I/P - O/P relation) | List II (Property of the system) | ||
---|---|---|---|

A. | y(n) = x(n) | 1. | Nonlinear, non-causal |

B. | y(n) = x(n^{2}) | 2. | Linear, non casual |

C. | y(n) = x^{2}(-n) | 3. | Linear causal |

D. | y(n) = x^{2}(n) | 4. | Nonlinear causal |

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

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

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

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

⇒ Hay bridge is suitable for measuring inductance of which one of the following inductors?

Having Q value less than 10

Having Q value greater than 10

Having any value of Q

Having phase angle of reactance very large

⇒ A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in reverse direction. The reading on hot wire ammeter will be

0.416666666666667

0.208333333333333

3.185 A

1.414 A