Free Printable TechnoFreak

1.

1. Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 10^6 Hz in glass. Assume velocity of light is 3*10^8 m/sec in vacuum.

a)

a. 4µm

b)

b. 3µm

c)

c. 2µm

d)

d. 1µm

2.

2. Find R-value from the below circuit;

a)

17.5Ω

b)

17.2Ω

c)

17.4Ω

d)

17.8

3.

3. Determine currents I1,I2 and I3;

a)

3.3A,-8.5A,2.4A

b)

3A,-8A,2A

c)

3.3A,8.5A,-2.4A

d)

3.2A,8.6A,2.3A

4.

4. Relation between currents according to KCL is

a)

i1=i2=i3=i4=i5

b)

i1+i4+i3=i5+i2

c)

i1-i5=i2-i3-i4

d)

i1+i5=i2+i3+i4

5.

When the currents through the coil of an electromagnet reverse the

a)

a. Magnetic field expands

b)

b. Direction of magnetic field reverses

c)

c. Magnetic field collapses

d)

d. Direction of magnetic field remains unchanged

6.

Unit for Permeability is

a)

a. Wb/At*m

b)

b. At/Wb

c)

c. At/m

d)

d. Wb

7.

Which gates in digital circuit are required to convert a non-based SR to an SR flip-flop?

a)

a. Two 2 input AND gates

b)

b. Two 3 input AND gates

c)

c. Two 2 inputs OR gates

d)

d. Two 3 inputs OR gates

8.

How many times /counters 8051 16-bit microprocesser

a)

a. 1

b)

b. 2

c)

c. 5

d)

d. 8

9.

In a 3 phase semi-conductor, firing angle = 120° and extinction angle= 110°. Each SCR and freewheeling diode conducts respectively for

a)

a) 60°,50°

b)

b) 30°,50°

c)

c) 60°,10°

d)

d)30°,40°

10.

Copper has a resistivity of 17*10¯9Ωm. What is the end to end resistance of a copper strip, 2cm long with cross-sectional dimensions 5mm*1mm ?

a)

a) 34µΩ

b)

b) 68µΩ

c)

c) 34µΩ

d)

d) 68µΩ

11.

In a resistor, the first three bands from left to right colours yellow, violet and red. What is the value of resistor in ohms.

a)

a) 6700

b)

b) 540

c)

c) 52000

d)

d) 4700

12.

A transistor can be made to operate as a switch by operating it in which of the following regions?

a)

a) Active Region

b)

b) Active Region, Cut off Region

c)

c) Active Region, Saturation Region

d)

d) Saturation Region, Cut off Region

13.

A Limiter circuit is also known as a

a)

a) Clamp circuit

b)

b) Chopping circuit

c)

c) Clipper circuit

d)

d) Chopper circuit

14.

If frequency of an alternator increases then

a)

a) It’s speed increases

b)

b) It’s speed decreases

c)

c) Speed will remain constant

d)

d) None of the options

15.

If 1A current flows in a circuit , the number of electrons flowing through this circuit is

a)

a) 0.625*10^19

b)

b) 1.6*10^19

c)

c) 1.6*10^-19

d)

d) 0.625*10^-19

16.

An Op-Amp comparator circuit employs

a)

a) no feedback

b)

b) +ve feedback

c)

c) –ve feedback

d)

d) both b and c

17.

For n-bus power system size of Ybus matrix is

a)

a) (n-1)*(n-1)

b)

b) (n-2)*(n-2)

c)

c) n*n

d)

d) (n-1)*(n-2)

18.

What happens to the value of the fault current in case of SLG fault , if fault impedance is introduced ?

a)

a) the fault current increase

b)

b) the fault current remains same as in case of SLG fault

c)

c) the fault current becomes zero

d)

d) the fault current is reduced

19.

What is the value of fault current if , in case of SLG fault?

a)

a) 3*(Ea/Z1+Z2+Z0)

b)

b) 2*(Ea/Z1+Z0)

c)

c) 3*(Ea/Z1+Z2)

d)

d) 2*(Ea/Z1+Z2)

20.

Scott connection is used for the conversion of

a)

a) single phase to three phase

b)

b) three phase to single phase

c)

c) single phase to 2-phase

d)

d) all of these

TechnoFreak

Total questions: 20

Worksheet time: 11mins

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