IkodeAutomation

Q23. Which of the following factors concerning the sinusoidal alternating quantities is useful in the applications like insulation testing and measurement of iron losses?
a)Q-factor
b) utilization factor
c) peak factor
d) form factor

ANS: option C

Q24. For a symmetrical alternating waveform,the average value over a complete cycle is always _____?
a) 0
b) 0.637
c) 0.707
d) 1.414

ANS: a

Q25. In the case of an alternating current or voltage with a symmetrical waveform, the average value is always found by considering a period of_____.
a) whole cycle
b) half cycle
c) quarter cycle
d) none of the above

ANS :b

Q26. In a purely capacitive circuit , if the supply frequency is doubled ,the current will be____.
a) doubled
b) reduced to half
c) four times as high
d) reduced to one fourth

ANS: a

Q27. The r.m.s. value of a sinusoidal alternating current is equal to its instantaneous value at a phase angle (in degree) of_____.
a)90°
b) 60°
c) 45°
d) 30°

ANS: C

Q28. For a sinusoidal alternating quantity , the value of form factor is_____.
a)1.414
b) 1.11
c) 0.707
d) 0.637

ANS: b

Q29. The form factor of the d.c. supply voltage is_____.
a) infinite
b) 1.0
c) 0.5
d) 0

ANS: b

Q30. For a full-wave rectified sinusoidal alternating current with a peak value Im,the r.m.s. value is____.
a)0.707Im
b)0.637Im
c)0.318Im
d) zero

ANS: a

Q19. Three resistors each with a value of 0.069 mega ohm are in parallel the total resistance is_____.
a) 23 ohm
b) 23 k ohm
c) 204 ohm
d) 0.2 Mega ohm

ANS: 23k ohm

Q20.which system is appropriate for light load, fast movement application?
a) hydraulic system
b) pneumatic system
c) gear and chain drive
d) none of the above

ANS: option b

Q20.among the two alternating quantities with the same frequency , when one quantity attains maximum value, the other is at zero value. What must be the phase angle between these two alternating quantities?
a) 0 degree
b) 45 degree
c) 90 degree
d) 180 degree

ANS: option C

Q21. Which of the following statement is correct?
a) In a purely inductive circuit , current lags by 90° behind the applied voltage.
b) opposition offered by the inductance of a circuit to the flow of an alternating current is called inductive reactance.
c) the unit of inductive reactance is ohm.
d) all of the above.

ANS: option d

Q22. Which of the following is of practical importance in the electrochemical field?
a) average value
b) peak value
c) R.M.S. Value
d) peak to peak value

ANS: option a

Q. For a square wave, the form factor is_____.
a) 1.3
b) 1.2
c) 1.1
d) 1.0

ANS: option d.

Q. A transistor can be protected from needless overheating by____.
a) a current-limiting resistor.
b) bleeder resistors.
c)maximizing the drive.
d) shorting out the power supply when the circuit is off.

ANS: option C

Q14. A bleeder resistor ______.
a)is connected across the Capacitor in a power supply.
b) keeps a transistor from drawing too much currents.
c) prevents an amplifier from being over driven.
d) optimizes the efficiency of an amplifier.

ANS: option b

Q15. A phasor is_____.
a) a line representing the magnitude of an alternating quantity.
b) a line which represents the magnitude and direction of an alternating quantity.
c) a line which represent the magnitude and phase of an alternating quantity.
d) none of the above.

ANS: option C.

Q18. If the supply frequency of the purely inductive circuit is reduced to half, the current in the circuit will be______.
a) four times as high
b) halved
c) doubled
d) remains the same

ANS: option C

Q.if four resistors are connected in series ,each with a value of 4k ohm, then total resistance is______.

ANS: 16k ohm

Q.which of the following theorem can be applied to any network.which is linear or non linear ,active or passive, time or time invariant?
1.superposition theorem
2.norton's theorem
3.thevenin's theorem
4.tellegen's theorem

ANS: option 4

Q.proper biasing in an amplifier circuit _____
1.causes it to oscillate
2.prevents an impedance match.
3.can be obtained using a voltage divider network.
4.maximizes current flow.

ANS: option 3

Q. Which of the following frequencies has the longest period?
a)25 Hz
b) 50 Hz
c) 75 Hz
d)100Hz

ANS: option a.

Q.An advantage of rheostat over a potentiometer is______.
1.rheostat can handle higher frequencies.
2. Rheostat is more precise.
3. Rheostat can handle more current.
4. Rheostat works better with dc.

ANS: option 1

q.pr

Q. Capacitor blocks the ____components, and it allows to pass ____ components.

ANS: block dc and pass ac components.

Q. In a purely inductive circuit, if the supply frequency is doubled, the current will be_____.

ANS: reduced to half.

Q. The value of peak factor for a sinusoidal alternating quantity is_____.

ANS: 1.414

Q. Resistance of a conductor varies inversely as____.
1.resisitivity
2.area of cross section
3.inductance
4.length

ANS: area of cross section

COMPETITION

Q1. The ratio of r.m.s. value of an alternating quantity to its average value is called_____.

ANS : form factor

Today's question,
Q30. For a full-wave rectified sinusoidal alternating current with a peak value Im,the r.m.s. value is____.
a)0.707Im
b)0.637Im
c)0.318Im
d) zero

Today's question,
Q29. The form factor of the d.c. supply voltage is_____.
a) infinite
b) 1.0
c) 0.5
d) 0