# A high Q-quartz crystal exhibits series resonance at the frequency ωs and parallel resonance at the Frequency ωp.Then

1.  ωs is very close to ,but less than ωp

2.  ωs > ωp

3.  ωs is very close to ,but greater than ωp

4.  ωs < ωp

4

ωs is very close to ,but less than ωp

Explanation :
No Explanation available for this question

# In  the Bode-plot of a unity  feedback control system, the value of phase of G(jω) at the gain cross  over frequency is –1250. The phase margin of the system is

1.  -1250

2.  -550

3.  550

4.  1250

4

550

Explanation :
No Explanation available for this question

# One input  terminal  of high  gain comparator circuit is connected  to ground and a sinusoidal voltage  is applied to the other input. The output of comparator will be

1.  a sinusoid

2.  a full rectified sinusoid

3.  a half rectified sinusoid

4.  a square wave

4

a square wave

Explanation :
No Explanation available for this question

# Consider a feedback control system with loop transfer function G(s)H(s)= K(1+0.5s)/s(s+1)(1+2s) The type of the closed loop system is

1.  zero

2.  one

3.  two

4.  three

4

one

Explanation :
No Explanation available for this question

# In  a  series  regulated  power  supply  circuit,  the  voltage  gain Av of the  ‘pass’ transistor satisfies  the condition

1.  Av→∞

2.  1 < Av < ∞

3.  Av =1

4.  Av < 1

4

Av =1

Explanation :
No Explanation available for this question

# For  full wave rectification,  a four diode bridge rectifier is claimed to have the following advantages over a two diode circuit: 1)less expensive transformer 2)smaller size transformer, and 3)suitability for higher voltage application of these

1.  only (1) and (2) are true

2.  only (1) and (3) are true

3.  only (2) and (3) are true

4.  (1), (2) as well as (3) are true

4

(1), (2) as well as (3) are true

Explanation :
No Explanation available for this question

# The transfer function of a phase lead controller is  (1+3Ts)/(1+Ts). The maximum value of phase provided by this controller is

1.  900

2.  600

3.  450

4.  300

4

300

Explanation :
No Explanation available for this question

# The Nyquist plot of a phase transfer function g(jω)H(jω) of a system encloses the (-1,0) point. The    gain margin of the system is

1.  less than zero

2.  zero

3.  greater than zero

4.  infinity

4

less than zero

Explanation :
No Explanation available for this question

# The minimum number of 2-input NAND gates required to implement the Boolean function  z =A B assuming that A, B and C are available, is

1.  two

2.  three

3.  five

4.  six

4

five

Explanation :
No Explanation available for this question

# The transfer function of a system is (2s2+6s+5)/(s+1)2(s+2) The characteristic equation of the system Is

1.  2s2+6s+5=0

2.  (s+1)2(s+2)=0

3.  2s2+6s+5+ (s+1)2(s+2)=0

4.  2s2+6s+5- (s+1)2(s+2)=0

4