The ideal OP-AMP has the following characteristics

A. ri=∞ ,a=∞ ,r0=0
B. ri=0 ,a=∞ ,r0=0
C. ri=∞ ,a=∞ ,r0=∞
D. ri=0 ,a=∞ ,r0=∞

If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will_____________?

A. Not need an input resistor
B. Be virtual ground
C. Have high reverse current
D. Not invert the signal

An ideal OP-AMP is an ideal______________?

A. current controlled current source
B. current controlled voltage source
C. voltage controlled voltage source
D. voltage controlled current source

A non inverting closed loop op amp circuit generally has a gain factor______________?

A. Less than one
B. Greater than one
C. Of zero
D. Equal to one

The closed-loop voltage gain of an inverting amplifier equal to______________?

A. The ratio of the input resistance to feedback resistance
B. The open-loop voltage gain
C. The feedback resistance divided by the input resistance
D. The input resistance

Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF___________?

A. 1.273khz
B. 12.73khz
C. 127.3 khz
D. 127.3 hz

The fuse blows off by___________?

A. burning
B. arcing
C. melting
D. none of the above

H.R.C. fuse, as compared to a rewirable fuse, has_________________?

A. no ageing effect
B. high speed of operation
C. high rupturing capacity
D. all of the above

An isolator is installed_____________?

A. to operate the relay of circuit breaker
B. as a substitute for circuit breaker
C. always independent of the position of circuit breaker
D. generally on both sides of a circuit breaker

Protection by fuses is generally not used beyond__________?

A. 20 a
B. 50 a
C. 100 a
D. 200 a