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Cummins Technical Questions

Posted on :11-04-2016

Q1. Serial connector used for connecting 30 devices is

a) RS 232
b) RS 422
c) RS  485
d) None of these


Q2. Rotation in machines is related to

a) mechanical degrees
b) electrical degrees
c) both


Q3. The direction of electric field is

a) same as direction of current
b) opposite to that of  current


Q4. The motion of electron in magnetic field is

a) moves in straight line
b) in sine wave
c) perpendicular to the plane of propagation


Q5. SCR diode is

a) PNPN diode
b) PNPP diode
c) None of these


Q6. The unit of 1 watt is

a) 1 Nm/s
b) 1 Nm/hr


Q7. Memory of 8085 microprocessor can be extended to 64k by

a) using memory mapped 
b) cannot be increased
c) none of these


Q8. Question related to squirrel cage

a) V/f      
b) I/f     
c) Armature resistance


Q9. What is SCADA?

ANS: Supervisory Control And Data Aquisition


Q10. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is

a) good
b) open
c) shorted
d) partly shorted


Q11. Referring to the given circuit, L

a) must be in parallel with RL
b) must be placed in parallel with VS
c) must have a reactance equal to XC
d) has no effect on the result


Q12. When the current through the coil of an electromagnet reverses, the

a) direction of the magnetic field reverses
b) direction of the magnetic field remains unchanged
c) magnetic field expands
d) magnetic field collapses


Q13. Referring this circuit, determine the maximum output voltage when a single pulse is applied as shown. The total resistance is 60.

a) 2.73 V
b) 27.33 V
c) 30 V
d) 2.67 V


Q14. If the capacitor in an integrator becomes leaky,

a) the time constant will be effectively reduced
b) the wave shape of the output voltage across C is altered
c) the amplitude of the output is reduced
d) all of the above


Q15. The mesh method can be applied to circuits with any number of loops.

a) True
b) False


Q16. Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS?

a) 226 mW
b) 2.26 mW
c) 4.24 mW
d) 424 mW


Q17. When a 12 V input pulse with a width equal to one time constant is applied to an RC integrator, the capacitor charges to

a) 0 V
b) 12 V
c) 6.3 V
d) 7.56 V


Q18. Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.

a) True
b) False


Q19. When converting 0.16 mA to microamperes, the result is

a) 16 µA
b) 160 µA
c) 1,600 µA
d) 0.0016 µA


  
   






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