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Q1. | In gases the flow of current is due to |

A. | positive ions only [Wrong Answer] |

B. | electrons only [Wrong Answer] |

C. | electrons, positive ions and negative ions [Correct Answer] |

D. | electrons and positive ions [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 :**

⇒ In a single phase half wave ac regulator feeding a resistive load, the rms load current

is always positive

may be positive or negative

is always negative

can be even zero

⇒ The system of the given fi

has two poles and one zero in left half plane

has two poles and one zero in right half plane

has two poles in left half plane and zero in right half plane

none of the above

⇒ For 10 bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will

increased by 6 dB

increased by 12 dB

decreased by 6 dB

decreased by 12 dB

⇒ Which of the following is not a necessary advantage of negative feedback system?

Feedback improves speed of response

Feedback improves stability

Feedback reduces effect of variations in system parameters

Feedback reduces the effect of external disturbances

⇒ The forbidden energy gap between the valence band and conduction band will be wide in case of

semiconductors

all metals

good conductors of electricity

insulators

⇒ A ramp input applied to a unity feedback system results in 5% steady state error. The type number and zero frequency gain of the system are respectively.

1 and 20

0 and 20

0 and 1/20

1 and 1/20

⇒ The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8

9.19 A

9.91 A

10.56 A

8.61 A

⇒ A pulse transformer uses

ferrite core

air core

iron core

copper core

⇒ In the saturation region of CE output characteristics of

*n*-

*p*-

*n*transistor, V

_{CE}is about

0.5 V

15 V

- 0.5 V

- 15 V

⇒

Match the following:

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

A. | True type | 1. | Type of calculator in window |

B. | FIND | 2. | Window command |

C. | WORD PAD | 3. | Name of a Font |

D. | STANDARD | 4. | Has many features of a simple word processor |

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

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

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

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

⇒ 8255 A is a

programmable peripheral interface

I/O device

memory chip

none of the above

⇒ If V

_{a1}= V

_{a2}= 100 V and V

_{a0}= 0, then V

_{a}, V

_{b}, V

_{c}are

200, -100 and -100 V

100, 100, 300 V

200, 100, 100 V

100, -100, 100 V

⇒ The minimum number of 2 input NAND gates required to implement Boolean function A B C is A, B, C are available is

2

3

5

6

⇒ The number of leads in a DIAC are

2

3

4

6

⇒ In PCM, if the number of quantization levels is increased from 4 to 64, then the bandwidth requirement will approximately be increased __________ times.

8

16

3

32

⇒ An AM wave is given by

*s*(

*t*)

_{AM}= 20 (1 + 0.5 cos 10

^{3}

*t*+ 0.3 cos 10

^{4}

*t*cos 10

^{6}

*t*) the modulation index of the envelope is

0.5

0.58

0.3

0.8

⇒ Figure shows the V-

*i*characteristics of a material. The material is likely t

copper

carbon

zinc oxide

rubber

⇒ Quantization error occurs in

D/A converter

A/D converter

both D/A and A/D converter

neither D/A nor A/D converter

⇒ When reverse bias is applied to a junction diode

minority carrier current is increased

majority carrier current is increased

potential barrier is lowered

potential barrier is raised

⇒ The double energy transients occur in the

pure inductive coil

R-L circuit

R-C circuit

R-L-C circuit

⇒ Using the same flip flops

a synchronous flip flop can operate at higher frequency than ripple counter

a ripple counter can operate at higher frequency than synchronous counter

both ripple and synchronous counter can operate at the same frequency

can not determine

⇒ In a Parallel connection of circuit the bandwidth in terms of R, L, C is

B = 1/RC

B = 1/RL

B = 1/RLC

B = RLC

⇒ In the transformer shown in figure, the inductance measured across terminal 1 and 2 was 4 H with terminals 3 and 4 open. It was 3H when terminals 3 and 4 are short circuited. The coefficient of couplin

1

0.707

0.5

indeterminate due to insufficient data

⇒ In CE approximation, the upper end of d.c. load line is called the __________ point and the lower end is the __________ point.

Q, base

base, Q

saturation, cut off

cut off, saturation

⇒ When all the seven segments of a display are energized, the number shown is

0

1

7

8

⇒ A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be

20 kΩ

19.9 kΩ

1.9 kΩ

20.1 kΩ

⇒ In the circuit of figure the current through 3 Ω resistance at

*t*= &infin

0.166666666666667

2.5 A

3.1 A

0

⇒ Each cell of a static RAM has

4 MOS transistors

4 MOS transistors and 2 capacitors

2 MOS transistors and two capacitors

1 MOS transistor and 1 capacitor

⇒ In an unloaded transformer, the fluxes limiting the primary and secondary are 30 mWb and 20 mWb. The coefficient of coupling is

1

0.1

0.33

0.67

⇒ In a P-N-P transistor, with normal bias

the collector junction has negligible resistance

only holes cross the collector junction

the collector-base junction is reverse biased and the emitter base junction is forward biased

only majority carriers cross the collector junction