Q.541 Good power transformer has voltage regulation
A. 100%
B. below 5%
C. Between 90% to 100%
D. Between 50% and 100%
Ans.: B
Q.542 Power factor us the cosine of phase difference between voltage and current is the statement correct for linear as well as non linear load?
A. Yes
B. No
C. partially correct
D. None of the above
Ans.: C
Q.543 One megabyte is equivalent to
A. 2^10 bytes
B. 2^20 ytes
C. 2^30 bytes
D. None of the above
Ans.: B
Q.544 The main reason for connecting a pulse transformer at the opposite stage of a thyristor triggering circuit is
A. Amplify the power of triggering pulse
B. Provide electrical isolation
C. Reduce the turn on time of the thyristor
D. Avoid spurious triggering of the thyristor due to noise
Ans.: B
Q.545 Diode is a _____ device
A. Unilateral and linear
B. Bilateral and linear
C. Unilateral and non linear
D. Bilateral and non linear
Ans.: C
Q.546 The principles of homogeneity and superposition are satisfied for
A. Linear time variant system and non linear time variant system
B. Non linear time variant system
C. Linear time invariant system
D. Non linear time variant system
Ans.: C
Q.547 In a linear system, an input of 5 sin wt produces and output of 10 cos wt. the output corresponding to 10 cos wt will be equal to
A. 5 sin wt
B. 20 sn wt
C. -5 sin wt
D. -20 sin wt
Ans.: D
Q.548 Which of the following material is not used as fuse element?
A. Silver
B. Copper
C. Aluminium
D. Carbon
Ans.: D
Q.549 Increase in load on a power system (loading) represents___ impedance
A. Increased
B. Decreased
C. Constant
D. None of the above
Ans.: B
Q.550 The rms value of the periodic waveform as shown in figure is
A.√3/2 A
B. √2/3 A
C. √1/2
D. √2 A
Ans.: B
Q.551 Transistor is operated in its ____region when it works as an amplifier.
A. Cut off
B. Saturation
C. Active
D. All of the above
Ans.: C
Q.552 The early effect in a bipolar junction transistor is caused by
A. Fast turn ON
B. Large collector base reverse bias
C. Fast turn OFF
D. large emitter-base forward bias
Ans.: B
Q.553 The single-phase two winding transformer has turns ratio 2:1. If the primary voltage is 230 volts. Find the secondary voltage
A. 460 V
B. 230 V
C. 115 V
D. none
Ans.: C
Q.554 The output rating of motor is given in
A. KW
B. KVA
C. KVAR
D. All of the above
Ans.: A
Q.555 Following is the truth-table of ____gate.
A.AND
B. NAND
C. OR
D. NOR
Ans.: A