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