A CRO probe has an impedance of 500 kΩ in parallel with a capacitance of 10 pF.The probe is used to measure the voltage between P and Q as shown in figure.The measured voltage will be

1.  3.53 V

2.  4.37 V

3.  4.54 V

4.  5.00 V

View Answer  
4
Correct Answer :

3.53 V


Explanation :
No Explanation available for this question

A moving coil of a meter has 100 turns,and a length and depth of 10 mm and 20 mm respectively.It is positioned in a uniform radial flux density of 200 mT.The coil carries a current of 50 mA.The torque on the coil is

1.  200 μNm

2.  100 μNm

3.  2 μNm

4.  1 μNm

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4
Correct Answer :

200 μNm


Explanation :
No Explanation available for this question

A dc A-h meter is rated for 15A,250 V.The meter constant is 14.4 A-sec/rev.The meter constant at voltage may be expressed as

1.  3750 rev/kWh

2.  3600 rev/kWh

3.  1000 rev/kWh

4.  960 rev/kWh

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4
Correct Answer :

1000 rev/kWh


Explanation :
No Explanation available for this question

A moving iron ammeter produces a full scale torque of 240 μNm with deflection of 120o at a current of 10A.The rate of change of self-inductance (Μh/radian)of the instrument at full scale is

1.  2.0 μH/radian

2.  4.8 μH/radian

3.  12.0 μH/radian

4.  114.6 μH/radian

View Answer  
4
Correct Answer :

4.8 μH/radian


Explanation :
No Explanation available for this question

A single-phase load is connected between  R and Y terminals of a 415 V,symmetrical .3-phase,4-wire system with phase sequence RYB.A wattmeter is connected in the system as shown in the figure.The power factor of the load is 0.8 lagging.The wattmeter will  read

1.  -795 W

2.  -597 W

3.  +597 W

4.  +795 W

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4
Correct Answer :

-597 W


Explanation :
No Explanation available for this question

A 50 Hz,bar primary CT has a secondary with 500 turns.The secondary supplies 5A current into a purely resistive burden of 1Ω.The magnetizing ampere-turns is 200.The phase angle between the primary and secondary current is

1.  4.6o

2.  85.4o

3.  94.60

4.  175.4o

View Answer  
4
Correct Answer :

4.6o


Explanation :
No Explanation available for this question

The core flux in the CT of prob.under the given operating condition is

1.  0

2.  45.0 μWb

3.  22.5 mWb

4.  100.0 mWb

View Answer  
4
Correct Answer :

45.0 μWb


Explanation :
No Explanation available for this question

A MOSFET rated for 15 A,carries a periodic current as shown in the figure.The ON state resistance of the MOSFET is 0.15Ω.The average ON state loss in the MOSFET is

1.  33.8 W

2.  15.0 W

3.  7.5 W

4.  3.8 W

View Answer  
4
Correct Answer :

7.5 W


Explanation :
No Explanation available for this question

The triac circuit shown in the figure controls the ac output power to the resistance load.The peak power dissipation in the load is

1.  3968 W

2.  5290 W

3.  7935 W

4.  10580 W

View Answer  
4
Correct Answer :

10580 W


Explanation :
No Explanation available for this question

Figure shows a chopper.The device S1 is the main switching device.S2 is the auxiliary commutation device.S1 is rated for 400 V,60 A.S2 is rated for 400V,30 A.The load current is 20 A.The main device operates with a duty ratio of 0.5.The peak current through S1 is

1.  10 A

2.  -30 A

3.  30 A

4.  40 A

View Answer  
4
Correct Answer :

-30 A


Explanation :
No Explanation available for this question
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