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BARC 2020: Mini Mock 5 (App update required to attempt this test)

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Question 1

The coil of a PMMC instrument has 60 turns, on a former that is 18 mm wide, the effective length of the conductor being 25 mm. It moves in a uniform field of flux density 0.5 Tesla. The control spring constant is 1.5 × 10-6 Nm/degree. Calculate the current required to produce a deflection of 100 degree?

Question 2

The ammeter – voltmeter method is used to measure the of an aircraft instrument resistance. With the voltmeter connected across the resistance, the reading an the ammeter and voltmeter are 0.3 A and 2.4V respectively. The resistance of the voltmeter is 450 V So the percentage error in the value of resistance, if the voltmeter currents is ignored

Question 3

A maxwell capacitance bridge is used to measure unknown inductance in comparison with capacitance. Where R2=100Ω, R3 = 200 Ω, R4= 300 Ω and C4=1 µF. calculate the value of inductance ______(fiil in the blanks).Calculate the value of R1 ?

Question 4

There will be serious errors if power factor of non-sinusoidal waveform is measured by electrodynamometer power factor meter. This is true for

Question 5

Which one of the following digital voltmeters is most suitable to eliminate the effect of period noise?

Question 6

The oscilloscope has an input capacitance of 50 pF and a resistance of 2 MΩ and the voltage divider ratio (k) of 10. What are the parameters of a high-impedance probe?

Question 7

In a CRT, electrons are accelerated through a potential difference of 10,000 V over a distance of 40 mm per minute ________ W is the average power supplied to the beam of electrons.

Question 8

Each of the ratio arms of a laboratory type wheat stone bridge has guaranteed accuracy of ±0.05% , while the standard arm has a guaranteed accuracy of ±0.1%. The ratio arms are both set at 1000 Ω and the bridge is balanced with standard arm adjusted to 3154 Ω . The upper and Lower limits of the unknown resistance, based upon the guaranteed accuracies of the known bridge arms.

Question 9

The coils of a wattmeter have resistances 0.01 Ω and 1000 Ω; their inductance may be neglected. The wattmeter is connected as shown in the figure, to measure the power consumed by a load, which draws 25 A at power factor 0.8. The voltage across the load terminals is 30 V. The percentage error on the wattmeter reading is _________.

Question 10

For measurement of power in a single-phase circuit, an electrodynamometer type wattmeter is used. If the load voltage of 120 V & load current of 10 A is flowing at a lagging pf of 0.The resistance of 2700 Ω & an inductance of 25 mH is placed in voltage circuit of the wattmeter, then what would be the percentage error in the wattmeter reading when the pressure coil is connected on the supply side. Find the percentage error up-to two decimal point, If the current coil in a resistance of 0.15 Ω & f = 50 Hz. Taking negligible inductance of current coil.

Question 11

void main ()
{        printf (“%d”, printf (“gate2018”)) ;   }

Question 12

Where is a hub specified in the OSI model?

Question 13

Consider the following C program:


int main(){

float sum = 0.0, j = 1.0, i = 2.0;

while (i/j > 0.0625){

j = j + j;

sum = sum + i/j;

printf("%f\n", sum);


return 0;


The number of times the variable sum will be printed, when the above program is executed, is _________________.

Question 14

Consider the following C program:
int main()
{   int a=1;
     int b=1;
     int c= a++ || b--;
     printf("%d%d", c,b);

Which of the following represents output of above C program?

Question 15

How long is an IPv6 address?

Question 16

Trace the output
int i,j,k, x =0;
for(i=0; i < 4; ++i)
for(j=0; j < i; ++j)
  Switch( i + j – 1)
     case – 1 :
     case 0 : x + = 1;
     case 1 :
     case 2 :
     case 3 : x + = 2;
     default : x + = 3;

Question 17

Which layer 1 devices can be used to enlarge the area covered by a single LAN segment?

1) Switch

2) NIC

3) Hub

4) Repeater

Question 18

As x is increased from –∞ to ∞, the function

Question 19

Ten percent of screws produced in a certain factory turn out to be defective. Find the probability that in a sample of 10 screws chosen at random, exactly two will be defective.

Question 20

The solution of is
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Posted by:

Chandani PrakashChandani PrakashMember since Jul 2019
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