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NTS Jr Engineer SDO Past Paper 2015

NTS  Jr Engineer SDO Past Paper 2015

1.When electric field is parallel to the plane of incidence, the electromagnetic wave is said to be
a.Linearly polarized
b.circularly polarized
c. Elliptically polarized
d. Hyperbolically polarized
2. Due to velocity saturation, MOSFET reaches saturation
a.Before Pinch off
b. After pinch off
c. At Q point
d. Before Q point
e. After Q point
3. Which system use dc to dc high voltage gain

A. Solar system

B. Battery backup
4. Natural frequency in the control system represents nature of
a. Transient response
b. Oscillations
c. Overshoot
d. Speed of responce
5.Which thing is maximum in RLC circuit at resonance
a)power consumption
b)inductive current

c)capacitive voltage

6.which theorem is used to analyse fault
a)thevinin
b)Norton
c)Superposition
d)jordan
7. For high frequency application we use which transformer?
8. For overhead protection we use which transformer?
9. Which fault is caused by lightening and thuderstorm
a. Line to line fault
b. Single line to ground fault
c. Double line to ground fault
10.Which modulation has higher data rates
a.fm
b.am
c.qam
d.qpsk

11.An active element is one which
a. Supplies energy
b. Absorbs energy
c. Supplies energy and convert energy from one form to another
12. The ripple frequency in output of fullwave bridge rectifier is
a. Half the input
b. Twice the input
c. Same as input
13. Less cost of delta connection over star connection
a. No fourth neautral wire
14.Transmission lines usually use
a.3 phase
b.2 phase
c. Single phase
15. In aerodynamic turbines which element is NOT there
a.stator
b.compressor
c. Fuel intake system
d.fans
16. Batteries used for electrical energy storage are
a. Laclanche cells
b. Edison cells
c. Lead acid cells
d.any of the above
17.A circuit breaker on detecting fault will
a. Open
b. Close
c. Open and trigger the alarm
18.If we have two nodes A and B and Vab is the potential difference between these nodes then which node is called reference node
a.node A
b.node B
c. Ground node
19. To have variable speeds we use
a. Induction motor
b. Traction motor
c. Shunt motor
20. ROC converges if poles and zeros lie inside
a. Origion
b. Z=1
21. Period of infinite continuous fourier series
a. N
b. N+M
c.infinite
22. Which protection detects both AC and DC?
23. In 3-phase 4-wire system, how many voltages are available
a.two
b.three
c.four
d.nine

G.K

Capital of turkey : ANKARA
2. When man 1st landed on moon : 1969, Apollo 11
3. Largest airport of Pakistan : Jinnah khi
4: literal meaning of Roza: abstinence
5. Ctrl F for finding any word in Ms Doc
6. Ideology of freedom movement was Islamic
7. BCC is a space for writing mail address

 

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