Electrical Engineering Quiz 40
1 / 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___________?
2 / 50
The delay fuses are used for the protection of ___________?
3 / 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 ?
4 / 50
On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?
5 / 50
Basically a potentiometer is a device for________________?
6 / 50
Electric current passing through the circuit produces_____________?
7 / 50
Capacitive susceptance is a measure of__________?
8 / 50
The rupture of co-valent bonds will occur when the electric field is__________________?
9 / 50
The term ?cogging? is associated with___________?
10 / 50
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)?
11 / 50
Magnetic field in a D.C. generator is produced by_______________?
12 / 50
The series field of a short-shunt D.C. generator is excited by_______________?
13 / 50
A current amplification of 2000 is a gain of_________________?
14 / 50
Voltage Series feedback also called series-shunt feedback) results in__________?
15 / 50
The cathdde voltage drop, in a mercury arc rectifier, is due to_____________?
16 / 50
A Weston frequency meter is_____________?
17 / 50
Murray loop test can be used for location of________________?
18 / 50
The ac voltage controller can be used for ___________?
19 / 50
When a transistor is driven to cut off, ideally the output is _______________?
20 / 50
The length cf air gap to be provided in __________ is primarily determined by power factor consideration?
21 / 50
The most suited gate pulses given to the AC regulator with R ? L load can be in the form of____________?
22 / 50
method has leading power factor____________?
23 / 50
In a 3 phase VSI out of eight valid states, the number of valid states that produce zero ac line voltages is/are_________?
24 / 50
Effect of moisture on the insulating materials is to________________?
25 / 50
For an overhead line, the surge impedance is taken as________________?
26 / 50
The motor used on small lathes is usually_________?
27 / 50
Which of the following can be measured by the use of a tachogenerator ?
28 / 50
The input resistance of a VTVM is about ______________?
29 / 50
An emitter follower has ______________input impedance?
30 / 50
Dielectric strength of medium____________?
31 / 50
The lead-acid cell should never be discharged beyond____________?
32 / 50
The power demand can be estimated approximately by____________?
33 / 50
Very large values of modulation index (greater than 3.24) lead to___________?
34 / 50
A switch has ______________?
35 / 50
A fuse is never inserted in____________?
36 / 50
1 db corresponds to_____________change in voltage or current level?
37 / 50
In a pure resistive circuit__________?
38 / 50
In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?
39 / 50
In a transistor if ? = 100 and collector current is 10 mA, then IE is___________?
40 / 50
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?
41 / 50
When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
42 / 50
The surge resistance of cable is__________?
43 / 50
In CE arrangement, the value of input impedance is approximately equal to ______________?
44 / 50
need frequent starting and stopping of electric motors ?
45 / 50
Power amplifiers generally use transformer coupling because transformer permits______________?
46 / 50
Conductance : mho :: ____________?
47 / 50
Dynamic equalising circuit is useful____________?
48 / 50
Fleming?s right-hand rule regarding direction of induced e.m.f., correlates__________?
49 / 50
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
50 / 50
For which of the following protection from negative sequence currents is provided ?
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