Question for JK SET Electronic Science - Quiz / Questions / MCQ in English

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Latest JK SET Electronic Science Exam Question (Objective Questions), MCQ in English

Subjects : Electronic Science

Question Bank JK SET Electronic Science Exam - English

Electronic Science

Q 1 :

For a JFET IDSS = 8 mA and peak voltage Vp = –8 V, what will be the drain current for gate to source voltage of –2V?

1. A.
   4.5 mA
2. B.
   8 mA 
3. C.
   16 mA 
4. D.
   12 mA

Show Answer

Q 2 :

The leakage current in silicon p-n junction at room temperature is of the order of 

1. A.
   mA
2. B.
   mA
3. C.
   mmA 
4. D.
   Amp

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Q 3 :

A tree in a network has a

1. A.
   closed path
2. B.
   no closed path
3. C.
   no nodes
4. D.
   no branches

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Q 4 :

In the given network, Z11 is equal to 

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Q 5 :

Which is a three-terminal negative voltage regulator IC? 

1. A.
   78 XX
2. B.
   IC 723
3. C.
   LM 317
4. D.
   79 XX

Show Answer

Q 6 :

Three identical stages have overall upper 3 dB frequency of 2 KHz and lower 3 dB frequency of 20 Hz. What is the value of fH of each stage?

1. A.
   13 KHz 
2. B.
   26 KHz
3. C.
   39 KHz 
4. D.
   52 KHz

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Q 7 :

A combinational circuit has inputs A, B and C and its K-map is as shown, the output of the circuit will be

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Q 8 :

The output f of the 4-to-1 Mux shown in the given figure is

1. A.XY + X
2. B.X + Y
3. C.x  + y 
4. D.XY

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Q 9 :

Microprocessor 8086 allows floating point arithmetic calculations in

1. A.
   Maximum mode
2. B.
   Minimum mode
3. C.
   Both maximum and minimum modes
4. D.
   Neither in maximum nor in minimum mode

Show Answer

Q 10 :

Which of the following chip is used in 8085 microprocessor 3-chip configuration? 

1. A.
   IC 8255 
2. B.
   IC 8155
3. C.
   IC 8251
4. D.
   IC 8257

Show Answer

Q 11 :

C Language is a__________

1. A.
   High level language
2. B.
   Low level language
3. C.
   Machine level language
4. D.
   Middle level language

Show Answer

Q 12 :

In a ‘C’ language expression, if the following expressions appear, which will be evaluated first? 

1. A.
   x + y 
2. B.
   x · y 
3. C.
   (x + y) 
4. D.
   x / y 

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Q 13 :

If  E =2m of a wave in free space, the value of magnetic field (H) is 

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Q 14 :

A 20 kW carrier is sinusoidally modulated by two carriers corresponding to modulation index of 30% and 40% respectively. The total radiated power is ​

1. A.
   25 kW 
2. B.
   22.5 kW
3. C.
   45.0 kW 
4. D.
   35.0 kW

Show Answer

Q 15 :

ASCII code has 128 characters, which are binary coded. If a computer generates 106 characters per second, then minimum band width required to transmit this signal will be

1. A.
   1.4 mbps 
2. B.
   14 mbps
3. C.
   7 mbps 
4. D.
   0.7 mbps

Show Answer

Q 16 :

When the current through SCR is greater than holding current, then the voltage across the SCR is

1. A.
   1.4 V
2. B.
   0 V
3. C.
   Supply voltage
4. D.
   Half the load voltage

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Q 17 :

Dispersion shifted wave length is   

1. A.
   800 nm
2. B.
   1550 nm
3. C.
   1310 nm 
4. D.
   1200 nm

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Q 18 :

The most suitable instrument for the measurement of voltage is

1. A.
   DVM 
2. B.
   Analog voltmeter
3. C.
   CRO 
4. D.
   DMM

Show Answer

Q 19 :

The characteristic polynomial of a system is q(s) = 2s⁵ + s4 + 4s³ + 2s² + 2s + 1The system is

1. A.
   Stable
2. B.
   Marginally stable
3. C.
   Unstable
4. D.
   Oscillatory

Show Answer

Q 20 :

Consider the following four transistors :

1. CEmode 2. CCmode

3. MOSFET 4. FET

The correct order in which, the input impedance increases is 

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

Show Answer

Q 21 :

The correct order in which the power dissipation in transistor in power amplifiers decreases :

1. Class A 2. Class C

3. Class B 4. Class AB 

The correct order is 

1. A.
   1, 3, 2 and 4 
2. B.
   1, 3, 4 and 2
3. C.
   1, 2, 3, 4
4. D.
   4, 3, 2, 1

Show Answer

Q 22 :

The following are the interrupts of 8085 microprocessor :

1. INTR 2. TRAP

3. RST 7.5 4. RST 5.5

The correct order in which these interrupts will be executed, if arrive simultaneously : 

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

Show Answer

Q 23 :

The following are the oscillators :

1. Crystal

2. Weinbridge

3. Colpitt’s

4. Tunnel diode oscillator

The correct sequence of decreasing order of the frequency of oscillation will be :

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

Show Answer

Q 24 :

Following are the controllers :

1. On-off 2. PID

3. PI

The correct order of the decrease in error output is

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

Show Answer

Q 25 :

An n-type silicon sample has a resistivity of 5 -cm at T = 300 K. If mobility is mn = 1350 cm2/V-s, then donor impurity concentration is 

1. A.
   2.86 × 10^–14 cm^–3 
2. B.
   9.25 × 10¹⁴ cm^–3 
3. C.
   11.46 × 10¹⁵ cm^–3
4. D.
   1.1 × 10^–15 cm^–3 

Show Answer

Q 26 :

In a JFET, the amplification factory, transconductance gm and the dynamic drain resistance vd are related as.

1. A.200 
2. B.400 
3. C.200 
4. D.400 

Show Answer

Q 27 :

The figure shown below, is symbol of

1. A.
   P-channel depletion MOSFET
2. B.
   P-channel enhancement MOSFET 
3. C.
   Complementary MOSFET 
4. D.
   P-channel JFET

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Q 28 :

If  What is the determinant of admittance matrix ?  

1. A.
   0
2. B.
   1
3. C.5

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Q 29 :

If the branch in any network has a current source then the analysis is carried out by ______ analysis method. 

1. A.
   mesh
2. B.
   node 
3. C.
   supermesh 
4. D.
   supernode

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Q 30 :

The transfer function of RC low-pass filter network ​

1. A.
   RCs/1 + RCs
2. B.
   1/1 + RCs
3. C.
   RC/1 + RCs 
4. D.
   S/1 + RCs

Show Answer

Q 31 :

Biasing is done in class A mode to  

1. A.
   save power
2. B.
   improve stability
3. C.
   reduce number of sources
4. D.
   both (B) and (C)

Show Answer

Q 32 :

In analog computation, we use 

1. A.
   both integrator and differentiator 
2. B.
   only integrator 
3. C.
   only differentiator 
4. D.
   both in pair 

Show Answer

Q 33 :

To obtain 30% feedback factor for the circuit shown below : 

1. A.
   R₁ = 3R₂ 
2. B.
   2R₁ = 5R₂  
3. C.
   3R₁ = 7R₂ 
4. D.
   5R₁ = 9R₂  

Show Answer

Q 34 :

For IOLmax = 16 mA and IILmax = 0.0016 A,1he fan-out (low) is 

1. A.
   16 
2. B.
   10
3. C.
   1
4. D.
   1.6 

Show Answer

Q 35 :

Which Boolean expression describes the output ‘X’ in the arrangement given below : 

1. A.
   X = a + (b · c) 
2. B.
   X = a · (b + c)
3. C.
   X = (a · b) + c 
4. D.
   X = a + b + c

Show Answer

Q 36 :

The largest decimal number that can be stored in a MOD-64 counter is ​

1. A.
   64 
2. B.
   15
3. C.
   16 
4. D.
   63

Show Answer

Q 37 :

What is the Register address which matches with the address of the stack ?

1. A.
   03H  
2. B.
   07H
3. C.
   013H 
4. D.
   13H 

Show Answer

Q 38 :

In 8259, to avoid causing an interrupt due to an accidental noise pulse, the following action is done  

1. A.
   All unused interrupt lines are shorted together. 
2. B.
   All unused interrupt lines are connected to Vcc.
3. C.
   All unused interrupt lines are connected to ground.
4. D.
   All unused interrupt lines kept open. 

Show Answer

Q 39 :

Which of the ports in 8255, in which part of the port pins can be used as input lines and part of the port pines can be used as output lines ? 

1. A.
   PA 
2. B.
   PB
3. C.
   PC
4. D.
   PD

Show Answer

Q 40 :

Which loop structure would execute its statements atleast once even if the test condition fails for the first time itself? 

1. A.
   for 
2. B.
   if-else
3. C.
   do-while
4. D.
   while

Show Answer

Q 41 :

The expression evaluates to false in

int 1 = 3, J =7;  

double f = 5.5, g = 4.5; 

char ch = ‘T’;

1. A.
    (1 < = 5) & & (ch = = ‘T’)
2. B.
   (1 < 8) 11 (ch = = ‘L’)
3. C.
   (f > = 6) 11 (1·j) < 15
4. D.
   (f + g) = = 10.011 i < 2

Show Answer

Q 42 :

Word NEHA is to be entered in an array. Which array declaration is proper ? ​

1. A.
   Char name [4] = {‘N’, ‘E’, ‘H’, ‘A’};
2. B.
   Charname [5] = {‘N ‘E’, ‘H ‘A’ ‘’};
3. C.
   Charname [4] = “NEHA”; 
4. D.
   Charname [4] = ‘NEHA’;

Show Answer

Q 43 :

A transmission line having 50W impedance is transmitted to a load of (40 + j 30) ohms. The VSWRis 

1. A.
   j 0.033
2. B.
   0.8 + j 0.6
3. C.
   2
4. D.
   1

Show Answer

Q 44 :

An air filled rectangular waveguide has dimensions 6 cm × 4 cm. The cut off frequency for TE10 is

1. A.
   2.5 GHz
2. B.
   25 MHz
3. C.
   20.5 GHz
4. D.
   5 GHz

Show Answer

Q 45 :

An antenna, when radiating, has a highly directional radiation pattern. When the antenna is receiving, its radiation pattern 

1. A.
   is more directive
2. B.
   is less directive
3. C.
   is same that of transmitting antenna
4. D.
   exhibits no directivity at all.

Show Answer

Q 46 :

The modulation index of an AM wave in changed from 0 to 1. The transmitted power is

1. A.
   unchanged
2. B.
   halved
3. C.
   doubled
4. D.
   increased by 50 percent

Show Answer

Q 47 :

In a low level AM system, amplifiers following the modulated stage must be ​

1. A.
   Linear devices
2. B.
   Harmonic device
3. C.
   Class C amplifier  
4. D.
   Non linear devices 

Show Answer

Q 48 :

Indicate the false statement. The square of the thermal noise voltage generated by a resistor is proportional to  

1. A.
   its temperature 
2. B.
   its resistance 
3. C.
   Boltzmann constant
4. D.
   the bandwidth over which it is measured

Show Answer

Q 49 :

The output of a dc motor depends mainly on  

1. A.
   Speed and torque
2. B.
   Speed and back emf
3. C.
   Speed and applied voltage
4. D.
   Speed and load resistance

Show Answer

Q 50 :

Which one of the following is an adjustable IC voltage regulator?

1. A.
   IC7824
2. B.
   IC7912
3. C.
   LM338
4. D.
   IC7808

Show Answer

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