| 1. | Which of the following is NOT a component of a CRO ? | |
|
Electron gun
|
||
|
Deflection plate system
|
||
|
Fluorescent screen
|
||
|
Motor
|
||
View Answer
Discuss in Forum
Report Question| 2. | A wattmeter is used to measure ............. ? | |
|
only AC power
|
||
|
only DC power
|
||
|
both AC and DC power
|
||
|
both AC and DC Voltage
|
||
| 3. | Determine the deflection factor (in V/m) of a CRO, when the deflection sensitivity of the CRO is 4 m/V ? | |
|
0.2
|
||
|
0.25
|
||
|
0.35
|
||
|
0.45
|
||
| 4. | Determine the value of current (in mA) for the full-scale deflection of a voltmeter, when the sensitivity of the voltmeter is 50 Ohms/Volt ? | |
|
1
|
||
|
2
|
||
|
10
|
||
|
20
|
||
| 5. | Determine the fastest rise time (in ms) of a sine wave that is reproduced by a CRO, when the bandwidth of the sine wave is 50 Hz ? | |
|
7
|
||
|
6
|
||
|
5
|
||
|
3
|
||
| 6. | Determine the value of shunt resistance (in Ohms) required to convert a galvanometer into ammeter of reading up to 14 A, when the internal resistance of the galvanometer is 27 Ohms and the value of current for full scale deflection is 0.5 A ? | |
|
4
|
||
|
2
|
||
|
1
|
||
|
0
|
||
| 7. | Calculate the value of reactive power (in VAR) of a circuit having power factor of 0.8, when the apparent power of the circuit is 200 VA ? | |
|
100
|
||
|
120
|
||
|
140
|
||
|
160
|
||
| 8. | A consideration of the power losses in electrical machines is essential for which of the following reasons ? | |
|
Operating cost
|
||
|
Temperature rise
|
||
|
Voltage drops
|
||
|
all option are correct
|
||
| 9. | The flux is maximum in the following part of a dc motor ? | |
|
pole core
|
||
|
under the interpole
|
||
|
under leading pole tip
|
||
|
under trailing pole tip
|
||
| 10. | In DC machine torque is proportional to ? | |
|
flux
|
||
|
armature current
|
||
|
both flux & armature current
|
||
|
None of these
|
||