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Q1. | Some ceramic materials become superconducting |

A. | below liquid helium temperature [Correct Answer] |

B. | between liquid helium and liquid nitrogen temperature [Wrong Answer] |

C. | above liquid nitrogen but below room temperature [Wrong Answer] |

D. | at room temperature [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation

has the same peak thyristor current as in 120° mode of operation

has higher peak thyristor current than in 120° mode of operation

has lower peak thyristor current than in 120° mode of operation

any of the above

⇒ In a class C power amplifier the input signal has a frequency of 250 kHz. If the collector current pulses are 0.1 μs wide, the duty cycle of current waveform is

0.5

0.25

0.025

0.0025

⇒ In a practical current source, the load current

is always equal to source current

is always less than source current

is always equal to or less than source current

cannot be higher than source current

⇒ Which of the following pairs of semiconductors and current carriers is correctly matched?

Intrinsic : number of electrons = number of holes

*P*type : number of electrons > number of holes

*N*type : number of electrons < number of holes

Bulk : neither electrons nor holes

⇒ An op-amp uses

RC coupling

direct coupling

transformer coupling

either (b) or (c)

⇒ For a Gaussian process, auto-correlation also implies

statistical dependence

statistical independence

ergodic process

none of the above

⇒ A 10 MHz square wave clocks 5 bit ripple counter. The frequency of the 3rd FF output is

2 MHz

1.25 MHz

50 MHz

615 kHz

⇒ In a resistance loaded amplifier, the gain decreases at high frequencies because

decreasing reactance of the stray C

_{T}

increasing reactance of the stray C

_{T}

increasing reactance of C

_{T}

decreasing reactance of C

_{T}

⇒ In a second order undamped system, the poles are on

positive real axis

imaginary axis

negative real axis

either (a) or (c)

⇒

**Assertion (A):** In state space analysis, capacitors are taken to be in tree.

**Reason (R):** State variable analysis is very suitable for computer solution.

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

⇒ In the stabilized reactance modulator AFC system

phase modulation is converted into amplitude modulation by the equalizer circuit

the discriminator frequency must not be too low or the system will fail

the discriminator must have a fast time constant to prevent demodulation

the higher discriminator frequency, better the oscillator frequency stability

⇒ 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

⇒ For a standard 2nd order system the maximum overshoot is 10% to an unit step input. If the magnitude of the input is doubled, then maximum overshoot and percentage of maximum overshoot is:

maximum overshoot doubles and percentage of maximum overshoot is less than double

maximum overshoot doubles and percentage of maximum overshoot do not change

maximum overshoot remain same and percentage of maximum overshoot is double

maximum overshoot more than double and percentage of maximum overshoot is less than double

⇒ A single phase half wave controlled rectifier circuit has a free wheeling diode. The load is a combination of R and L. The firing angle is a. The period of conduction of SCR and free wheeling diode respectively are

a < ω

*t*< p and p < ω

*t*< (2p + a)

a < ω

*t*< p and p < ω

*t*< 2p

a < ω

*t*< (p + a) and (p + a) < ω

*t*< 2p

a < ω

*t*< p and p < ω

*t*< (2p - a)

⇒ Inductors used at V.H.F. are made using

air core

cast iron cored

sheet steel cored

thin film technique

⇒ For the network shown below, the Thevenin voltage and R

_{TH}is equal to _______

0 V, 58.82 Ω

0 V, 96.774 Ω

0 V, 3 KΩ

None of these

⇒ What is the minimum value of VSWR that may exist on a transmission line?

Less than zero

Zero

One

10

⇒ The percentage saving in power of 100% modulated suppressed carrier AM signal is

100

75

66.6

50

⇒ For measurement of surface temperature of solids the elements of RTD is usually in the shape of

bar

coil

flat grid

either (a) or (b)

⇒ In 8085 microprocessor, what is the memory address stored on the stack, when the program is interrup

0210 H

0.211 H

0118 H

020 FH

⇒ The number of variables in a function is odd and the number of minterms with even number of 0's are same as the number of minterms with odd number at 1 's, the expression formed can be represented in __________ as well as __________ form.

exclusive - OR, NOR

equivalence, exclusive - OR

AND, coincidence

OR, exclusive - OR

⇒ Fibers have numerical aperture (

*NA*) in the range of 0.15 to 0.4 Fibers with higher

*NA*value would have

reduced losses

high bandwidth

reduced losses and low bandwidth

more losses and low bandwidth

⇒ In waveguides the existing waves are

TE only

TM only

both (a) and (b)

all of the above

⇒ Photoelectric effect occurs only in semiconductors and not in metals.

TRUE

FALSE

⇒ In a second order system ω

*= 10 rad/sec and ζ = 0.1, then ω*

_{n}_{d}=

9.1 rad/sec

9.95 rad/sec

9 rad/sec

1 rad/sec

⇒ The temperature coefficient of resistivity of semiconductors is

positive

negative

may be positive or negative

very low

⇒ When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power

remains the same

increases by 25%

increases by 33.3%

increases by 50%

⇒ Non-coherently detection is not possible for

PSK

ASK

FSK

both (a) and (c)

⇒ For a nonlinear resistance

*v*-

*i*plot is not a straight line

resistance increases as current increases

resistance decreases as current increases

current decreases as voltage increases

⇒ In TTL the transistors are driven into and out of saturation.

TRUE

FALSE