Electrical Engineering Quiz 40
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A series resonant band-pass filter consists of a 2 mH coil, a 0.005 ?F capacitor, and a 120 ? resistor. The winding resistance of the coil is 12 ?. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
2 / 50
Dielectric strength of medium____________?
3 / 50
In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?
4 / 50
A current amplification of 2000 is a gain of_________________?
5 / 50
Magnetic field in a D.C. generator is produced by_______________?
6 / 50
The lead-acid cell should never be discharged beyond____________?
7 / 50
Capacitive susceptance is a measure of__________?
8 / 50
The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
9 / 50
For which of the following protection from negative sequence currents is provided ?
10 / 50
1 db corresponds to_____________change in voltage or current level?
11 / 50
An amplifier without feedback has a voltage gain of 50,input resistance os 1 K? & Output resistance of 2.5K?.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
12 / 50
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
13 / 50
Electric current passing through the circuit produces_____________?
14 / 50
The input resistance of a VTVM is about ______________?
15 / 50
Conductance : mho :: ____________?
16 / 50
In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
17 / 50
Very large values of modulation index (greater than 3.24) lead to___________?
18 / 50
The series field of a short-shunt D.C. generator is excited by_______________?
19 / 50
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
20 / 50
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
21 / 50
For an overhead line, the surge impedance is taken as________________?
22 / 50
Murray loop test can be used for location of________________?
23 / 50
need frequent starting and stopping of electric motors ?
24 / 50
When a transistor is driven to cut off, ideally the output is _______________?
25 / 50
In CE arrangement, the value of input impedance is approximately equal to ______________?
26 / 50
An emitter follower has ______________input impedance?
27 / 50
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
28 / 50
The rupture of co-valent bonds will occur when the electric field is__________________?
29 / 50
The motor used on small lathes is usually_________?
30 / 50
Power amplifiers generally use transformer coupling because transformer permits______________?
31 / 50
A Weston frequency meter is_____________?
32 / 50
A fuse is never inserted in____________?
33 / 50
The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
34 / 50
Basically a potentiometer is a device for________________?
35 / 50
Dynamic equalising circuit is useful____________?
36 / 50
The delay fuses are used for the protection of ___________?
37 / 50
Voltage Series feedback also called series-shunt feedback) results in__________?
38 / 50
The ac voltage controller can be used for ___________?
39 / 50
The term ?cogging? is associated with___________?
40 / 50
In a pure resistive circuit__________?
41 / 50
Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?
42 / 50
method has leading power factor____________?
43 / 50
The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?
44 / 50
A switch has ______________?
45 / 50
The power demand can be estimated approximately by____________?
46 / 50
Effect of moisture on the insulating materials is to________________?
47 / 50
The surge resistance of cable is__________?
48 / 50
Which of the following can be measured by the use of a tachogenerator ?
49 / 50
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
50 / 50
In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?
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